List of chess openings

This is a list of chess openings, organised by the Encyclopaedia of Chess Openings (ECO) code classification system. The chess openings are categorised into five broad areas ("A" through "E"), with each of those broken up into one hundred subcategories ("00" through "99"). The openings were published in five volumes of ECO, with volumes labeled "A" through "E".

This article uses algebraic notation to describe chess moves.

A – Flank openings

White first moves other than 1.e4, 1.d4 (A00–A39)
1.d4 without 1...d5, 1...Nf6 or 1...f5: Atypical replies to 1.d4 (A40–A44)
1.d4 Nf6 without 2.c4: Atypical replies to 1...Nf6 (A45–A49)
1.d4 Nf6 2.c4 without 2...e6 or 2...g6: Atypical Indian systems (A50–A79)
1.d4 f5: Dutch Defence (A80–A99)

A00–A09

White first moves other than 1.e4, 1.d4, 1.c4:

A00 Irregular Openings

Anderssen's Opening: 1. a3
Anderssen's Opening: Polish Gambit: 1. a3 a5 2. b4
Formation: Hippopotamus Attack: 1. a3 e5 2. b3 d5 3. c3 Nf6 4. d3 Nc6 5. e3 Bd6 6. f3 O-O 7. g3
Formation: Shy Attack: 1. a3 e5 2. g3 d5 3. Bg2 Nf6 4. d3 Nc6 5. Nd2 Bd6 6. e3 O-O 7. h3
Van Geet Opening: Reversed Nimzowitsch, Battambang Variation: 1. a3 e5 2. Nc3
Ware Opening: 1. a4
Ware Opening: Symmetric Variation: 1. a4 a5
Ware Opening: Wing Gambit: 1. a4 b5 2. axb5 Bb7
Ware Opening: Cologne Gambit: 1. a4 b6 2. d4 d5 3. Nc3 Nd7
Ware Opening: Ware Gambit: 1. a4 e5 2. a5 d5 3. e3 f5 4. a6
Ware Opening: Crab Variation: 1. a4 e5 2. h4
Ware Opening: Meadow Hay Trap: 1. a4 e5 2. Ra3
Polish Opening: 1. b4
Polish Opening: Symmetrical Variation: 1. b4 b5
Polish Opening: Birmingham Gambit: 1. b4 c5
Polish Opening: Outflank Variation: 1. b4 c6
Polish Opening: Outflank, Schuehler Gambit: 1. b4 c6 2. Bb2 a5 3. b5 cxb5 4. e4
Polish Opening: Baltic Defense: 1. b4 d5 2. Bb2 Bf5
Polish Opening: Myers Variation: 1. b4 d5 2. Bb2 c6 3. a4
Polish Opening: German Defense: 1. b4 d5 2. Bb2 Qd6
Polish Opening: Bugayev Attack: 1. b4 e5 2. a3
Polish Opening: Wolferts Gambit: 1. b4 e5 2. Bb2 c5
Polish Opening: Czech Defense: 1. b4 e5 2. Bb2 d6
Polish Opening: Bugayev Advance Variation: 1. b4 e5 2. Bb2 f6 3. b5
Polish Opening: Tartakower Gambit: 1. b4 e5 2. Bb2 f6 3. e4
Polish Opening: Queenside Defense: 1. b4 e6 2. Bb2 Nf6 3. b5 a6
Polish Opening: Queenside Defense, Rooks Exchange Line: 1. b4 e6 2. Bb2 Nf6 3. b5 a6 4. a4 axb5 5. axb5 Rxa1 6. Bxa1
Polish Opening: Queen's Indian Variation: 1. b4 e6 2. Bb2 Nf6 3. b5 b6
Polish Opening: Schiffler-Sokolsky Variation: 1. b4 e6 2. Bb2 Nf6 3. b5 d5 4. e3
Polish Opening: Dutch Defense: 1. b4 f5
Polish Opening: Grigorian Variation: 1. b4 Nc6
Polish Opening: King's Indian Variation: 1. b4 Nf6 2. Bb2 g6
Polish Opening: King's Indian Variation, Sokolsky Attack: 1. b4 Nf6 2. Bb2 g6 3. c4 Bg7 4. e3 d6 5. Nf3 O-O 6. d4
Polish Opening: King's Indian Variation, Schiffler Attack: 1. b4 Nf6 2. Bb2 g6 3. e4
Polish Opening: Karniewski Variation: 1. b4 Nh6
Saragossa Opening: 1. c3
Mieses Opening: 1. d3
Mieses Opening: Venezolana Variation: 1. d3 c5 2. Nc3 Nc6 3. g3
Mieses Opening: Reversed Rat: 1. d3 e5
Valencia Opening: 1. d3 e5 2. Nd2
Mieses Opening: Myers Spike Attack: 1. d3 g6 2. g4
Van't Kruijs Opening: 1. e3
Van't Kruijs Opening: Bouncing Bishop Variation: 1. e3 e5 2. Bc4 b5 3. Bb3
Amsterdam Attack: 1. e3 e5 2. c4 d6 3. Nc3 Nc6 4. b3 Nf6
Van't Kruijs Opening: Keoni-Hiva Gambit, Ekolu Variation: 1. e3 e5 2. Nc3 d5 3. f4 exf4 4. Nf3
Van't Kruijs Opening: Keoni-Hiva Gambit, Alua Variation: 1. e3 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3
Van't Kruijs Opening: Keoni-Hiva Gambit, Akahi Variation: 1. e3 e5 2. Nc3 Nf6 3. f4 exf4 4. Nf3
Barnes Opening: 1. f3
Barnes Opening: Gedult Gambit: 1. f3 d5 2. e4 g6 3. d4 dxe4 4. c3
Barnes Opening: Fool's Mate: 1. f3 e5 2. g4 Qh4#
Barnes Opening: Hammerschlag: 1. f3 e5 2. Kf2
Barnes Opening: Gedult Gambit: 1. f3 f5 2. e4 fxe4 3. Nc3
Hungarian Opening: 1. g3
Hungarian Opening: Sicilian Invitation: 1. g3 c5
Hungarian Opening: Reversed Modern Defense: 1. g3 d5 2. Bg2 c5
Hungarian Opening: Slav Formation: 1. g3 d5 2. Bg2 c6
Hungarian Opening: Bücker Gambit: 1. g3 d5 2. Bg2 e5 3. b4
Hungarian Opening: Winterberg Gambit: 1. g3 d5 2. Bg2 e5 3. c4 dxc4 4. b3
Hungarian Opening: Catalan Formation: 1. g3 d5 2. Bg2 e6
Hungarian Opening: Burk Gambit: 1. g3 e5 2. a3 d5 3. Nf3 e4 4. Nh4 Be7 5. d3
Hungarian Opening: Reversed Alekhine: 1. g3 e5 2. Nf3
Hungarian Opening: Reversed Brooklyn Defense, Brooklyn Benko Gambit: 1. g3 e5 2. Nf3 e4 3. Ng1 Nf6 4. b4
Hungarian Opening: Reversed Norwegian Defense: 1. g3 e5 2. Nf3 e4 3. Nh4
Hungarian Opening: Paris Gambit: 1. g3 e5 2. Nh3 d5 3. f4 Bxh3 4. Bxh3 exf4 5. O-O
Hungarian Opening: Dutch Defense: 1. g3 f5
Hungarian Opening: Pachman Gambit: 1. g3 f5 2. e4 fxe4 3. Qh5+ g6
Hungarian Opening: Myers Defense: 1. g3 g5
Hungarian Opening: Symmetrical Variation: 1. g3 g6
Lasker Simul Special: 1. g3 h5
Hungarian Opening: Van Kuijk Gambit: 1. g3 h5 2. Nf3 h4
Hungarian Opening: Asten Gambit: 1. g3 Nc6 2. Nc3 d5 3. d4 e5 4. dxe5 d4 5. Ne4 f5
Hungarian Opening: Indian Defense: 1. g3 Nf6
Grob Opening: 1. g4
Grob Opening: Grob Gambit: 1. g4 d5 2. Bg2
Grob Opening: Grob Gambit, Fritz Gambit: 1. g4 d5 2. Bg2 Bxg4 3. c4
Grob Opening: Romford Countergambit: 1. g4 d5 2. Bg2 Bxg4 3. c4 d4
Grob Opening: Grob Gambit, Fritz Gambit, Romford Countergambit: 1. g4 d5 2. Bg2 Bxg4 3. c4 d4 4. Bxb7 Nd7 5. Bxa8 Qxa8
Grob Opening: Grob Gambit Declined: 1. g4 d5 2. Bg2 c6
Grob Opening: Grob Gambit, Richter-Grob Gambit: 1. g4 d5 2. Bg2 c6 3. c4 dxc4 4. b3
Grob Opening: Spike Attack: 1. g4 d5 2. Bg2 c6 3. g5
Grob Opening: Grob Gambit, Keres Gambit: 1. g4 d5 2. Bg2 e5 3. d4 exd4 4. c3
Grob Opening: Grob Gambit, Basman Gambit: 1. g4 d5 2. Bg2 h5 3. gxh5
Grob Opening: Zilbermints Gambit: 1. g4 d5 2. e4 dxe4 3. Nc3
Grob Opening: Zilbermints Gambit, Zilbermints-Hartlaub Gambit: 1. g4 d5 2. e4 dxe4 3. Nc3 e5 4. d3
Grob Opening: Zilbermints Gambit, Schiller Defense: 1. g4 d5 2. e4 dxe4 3. Nc3 h5
Grob Opening: Keene Defense: 1. g4 d5 2. h3 e5 3. Bg2 c6
Grob Opening: Keene Defense, Main Line: 1. g4 d5 2. h3 e5 3. Bg2 c6 4. d4 e4 5. c4 Bd6 6. Nc3 Ne7
Grob Opening: Spike, Hurst Attack: 1. g4 e5 2. Bg2 d5 3. c4
Grob Opening: London Defense: 1. g4 e5 2. h3 Nc6
Grob Opening: Alessi Gambit: 1. g4 f5
Grob Opening: Double Grob: 1. g4 g5
Grob Opening: Double Grob, Coca-Cola Gambit: 1. g4 g5 2. f4
Clemenz Opening: 1. h3
Creepy Crawly Formation: Classical Defense: 1. h3 d5 2. a3 e5
Global Opening: 1. h3 e5 2. a3
Clemenz Opening: Spike Lee Gambit: 1. h3 h5 2. g4
Kádas Opening: 1. h4
Kádas Opening: Koola-Koola Variation: 1. h4 a5
Kádas Opening: Kádas Gambit: 1. h4 c5 2. b4
Kádas Opening: Myers Variation: 1. h4 d5 2. d4 c5 3. e4
Kádas Opening: Kádas Gambit: 1. h4 d5 2. d4 c5 3. Nf3 cxd4 4. c3
Kádas Opening: Beginner's Trap: 1. h4 d5 2. Rh3
Kádas Opening: Kádas Gambit: 1. h4 e5 2. d4 exd4 3. c3
Kádas Opening: Steinbok Gambit: 1. h4 f5 2. e4 fxe4 3. d3
Kádas Opening: Schneider Gambit: 1. h4 g5
Sodium Attack: 1. Na3
Sodium Attack: Celadon Variation: 1. Na3 e5 2. d3 Bxa3 3. bxa3 d5 4. e3 c5 5. Rb1
Sodium Attack: Durkin Gambit: 1. Na3 e5 2. Nc4 Nc6 3. e4 f5
Sodium Attack: Chenoboskion Variation: 1. Na3 g6 2. g4
Van Geet Opening: 1. Nc3
Van Geet Opening: Laroche Gambit: 1. Nc3 b5
Van Geet Opening: Düsseldorf Gambit: 1. Nc3 c5 2. b4
Van Geet Opening: Novosibirsk Variation: 1. Nc3 c5 2. d4 cxd4 3. Qxd4 Nc6 4. Qh4
Van Geet Opening: Sicilian Two Knights: 1. Nc3 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4
Van Geet Opening: Twyble Attack: 1. Nc3 c5 2. Rb1
Van Geet Opening: Venezolana Variation: 1. Nc3 d5 2. d3 Nf6 3. g3
Van Geet Opening: Sleipnir Gambit: 1. Nc3 d5 2. e3 e5 3. d4 Bb4
Van Geet Opening: Hector Gambit: 1. Nc3 d5 2. e4 dxe4 3. Bc4
Van Geet Opening: Dunst-Perrenet Gambit: 1. Nc3 d5 2. e4 dxe4 3. d3
Van Geet Opening: Dougherty Gambit: 1. Nc3 d5 2. e4 dxe4 3. f3
Van Geet Opening: Melleby Gambit: 1. Nc3 d5 2. f4 d4 3. Ne4 c5
Van Geet Opening: Pfeiffer Gambit: 1. Nc3 d5 2. f4 d4 3. Ne4 e5
Van Geet Opening: Pfeiffer Gambit, Sleipnir Countergambit: 1. Nc3 d5 2. f4 d4 3. Ne4 e5 4. Nf3
Van Geet Opening: Jendrossek Gambit: 1. Nc3 d5 2. f4 d4 3. Ne4 f5 4. Nf2 Nf6 5. Nf3 c5 6. b4
Van Geet Opening: Damhaug Gambit: 1. Nc3 d5 2. f4 e5
Van Geet Opening: Warsteiner Gambit: 1. Nc3 d5 2. f4 g5
Van Geet Opening: Hergert Gambit: 1. Nc3 d6 2. f4 e5 3. fxe5 Nc6
Van Geet Opening: Reversed Nimzowitsch: 1. Nc3 e5
Van Geet Opening: Gladbacher Gambit: 1. Nc3 e5 2. b3 d5 3. e4 dxe4 4. d3
Van Geet Opening: Reversed Scandinavian: 1. Nc3 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qa4
Van Geet Opening: Hulsemann Gambit: 1. Nc3 e5 2. e3 d5 3. Qh5 Be6
Van Geet Opening: Liebig Gambit: 1. Nc3 e5 2. e3 d5 3. Qh5 Nf6
Van Geet Opening: Nowokunski Gambit: 1. Nc3 e5 2. f4 exf4 3. e4
Van Geet Opening: Billockus-Johansen Gambit: 1. Nc3 e5 2. Nf3 Bc5
Van Geet Opening: Napoleon Attack: 1. Nc3 e5 2. Nf3 Nc6 3. d4
Van Geet Opening: Kluever Gambit: 1. Nc3 f5 2. e4 fxe4 3. d3
Van Geet Opening: Myers Attack: 1. Nc3 g6 2. h4
Van Geet Opening: Tübingen Gambit: 1. Nc3 Nf6 2. g4
Amar Opening: 1. Nh3
Amar Opening: Paris Gambit: 1. Nh3 d5 2. g3 e5 3. f4
Amar Opening: Paris Gambit, Gent Gambit: 1. Nh3 d5 2. g3 e5 3. f4 Bxh3 4. Bxh3 exf4 5. O-O fxg3 6. hxg3

A01 Larsen's Opening: 1.b3

Nimzo-Larsen Attack: 1. b3
Nimzo-Larsen Attack: Polish Variation: 1. b3 b5
Nimzo-Larsen Attack: Symmetrical Variation: 1. b3 b6
Nimzo-Larsen Attack: English Variation: 1. b3 c5
Nimzo-Larsen Attack: Classical Variation: 1. b3 d5
Nimzo-Larsen Attack: Graz Attack: 1. b3 d5 2. Ba3
Nimzo-Larsen Attack: Modern Variation: 1. b3 e5
Nimzo-Larsen Attack: Modern Variation: 1. b3 e5 2. Bb2 Nc6
Nimzo-Larsen Attack: Modern Variation: 1. b3 e5 2. Bb2 Nc6 3. c4 Nf6
Nimzo-Larsen Attack: Modern Variation: 1. b3 e5 2. Bb2 Nc6 3. e3
Nimzo-Larsen Attack: Pachman Gambit: 1. b3 e5 2. Bb2 Nc6 3. f4
Nimzo-Larsen Attack: Dutch Variation: 1. b3 f5
Nimzo-Larsen Attack: Ringelbach Gambit: 1. b3 f5 2. Bb2 e6 3. e4
Nimzo-Larsen Attack: Indian Variation: 1. b3 Nf6
Nimzo-Larsen Attack: Spike Variation: 1. b3 Nf6 2. Bb2 g6 3. g4

A02-A03 Bird's Opening

A02

Bird Opening: 1. f4
Bird Opening: Myers Defense: 1. f4 b5
Bird Opening: From's Gambit: 1. f4 e5
Bird Opening: Siegener Gambit: 1. f4 e5 2. d4 exd4 3. Nf3 c5 4. c3
Bird Opening: From's Gambit, Lasker Variation: 1. f4 e5 2. fxe5 d6 3. exd6 Bxd6 4. Nf3 g5
Bird Opening: From's Gambit, Lipke Variation: 1. f4 e5 2. fxe5 d6 3. exd6 Bxd6 4. Nf3 Nh6 5. d4
Bird Opening: From's Gambit, Langheld Gambit: 1. f4 e5 2. fxe5 d6 3. exd6 Nf6
Bird Opening: Lasker Gambit: 1. f4 e5 2. fxe5 f6
Bird Opening: Schlechter Gambit: 1. f4 e5 2. fxe5 Nc6
Bird Opening: Platz Gambit: 1. f4 e5 2. fxe5 Ne7
Bird Opening: From's Gambit, Bahr Gambit: 1. f4 e5 2. Nc3
Bird Opening: Double Duck Formation: 1. f4 f5 2. d4 d5
Bird Opening: Wagner-Zwitersch Gambit: 1. f4 f5 2. e4
Bird Opening: Swiss Gambit: 1. f4 f5 2. e4 fxe4 3. Nc3 Nf6 4. g4
Bird Opening: Hobbs Gambit: 1. f4 g5
Bird Opening: Hobbs-Zilbermints Gambit: 1. f4 h6 2. Nf3 g5
Bird Opening: Mujannah: 1. f4 Nf6 2. c4
Bird Opening: Batavo-Polish Attack: 1. f4 Nf6 2. Nf3 g6 3. b4
Bird Opening: Horsefly Defense: 1. f4 Nh6

A03 Bird's Opening, Dutch Variation:

Bird Opening: Dutch Variation: 1. f4 d5
Bird Opening: Thomas Gambit: 1. f4 d5 2. b3 Nf6 3. Bb2 d4 4. Nf3 c5 5. e3
Bird Opening: Sturm Gambit: 1. f4 d5 2. c4
Bird Opening: Williams Gambit: 1. f4 d5 2. e4
Bird Opening: Williams-Zilbermints Gambit: 1. f4 d5 2. e4 dxe4 3. Nc3 Nf6 4. Nge2
Bird Opening: Williams Gambit: 1. f4 d5 2. e4 dxe4 3. Nc3 Nf6 4. Qe2
Bird Opening: Dutch Variation, Dudweiler Gambit: 1. f4 d5 2. g4
Bird Opening: Lasker Variation: 1. f4 d5 2. Nf3 Nf6 3. e3 c5

A04-A09 Réti Opening or Zukertort Opening

A04

Zukertort Opening: 1. Nf3
Zukertort Opening: Ware Defense: 1. Nf3 a5
Zukertort Opening: St. George Defense: 1. Nf3 a6
Zukertort Opening: Polish Defense: 1. Nf3 b5
Zukertort Opening: Queenside Fianchetto Variation: 1. Nf3 b6
Zukertort Opening: Sicilian Invitation: 1. Nf3 c5
Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation: 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qa5+
Modern Defense: Semi-Averbakh Variation, Polish Variation: 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qb6
Zukertort Opening: Speelsmet Gambit: 1. Nf3 c5 2. d4 cxd4 3. e3
Colle System: Rhamphorhynchus Variation: 1. Nf3 c5 2. e3 g6 3. d4 Bg7 4. dxc5 Qa5+
Zukertort Opening: Slav Invitation: 1. Nf3 c6
Zukertort Opening: Pirc Invitation: 1. Nf3 d6
Zukertort Opening: Vos Gambit: 1. Nf3 d6 2. d4 e5
Zukertort Opening: Wade Defense: 1. Nf3 d6 2. e4 Bg4
Zukertort Opening: Ross Gambit: 1. Nf3 e5
Zukertort Opening: The Walrus: 1. Nf3 e5 2. Nxe5 Nc6 3. Nxc6 dxc6
Zukertort Opening: Queen's Gambit Invitation: 1. Nf3 e6
Zukertort Opening: Shabalov Gambit: 1. Nf3 e6 2. c4 a6 3. Nc3 c5 4. g3 b5
Zukertort Opening: Dutch Variation: 1. Nf3 f5
Zukertort Opening: Lisitsyn Gambit Deferred: 1. Nf3 f5 2. d3 Nf6 3. e4
Zukertort Opening: Lisitsyn Gambit: 1. Nf3 f5 2. e4
Zukertort Opening: Arctic Defense: 1. Nf3 f6
Zukertort Opening: Arctic Defense, Drunken Knight Variation: 1. Nf3 f6 2. e4 Nh6 3. d4 Nf7
Zukertort Opening: Herrstrom Gambit: 1. Nf3 g5
Zukertort Opening: Kingside Fianchetto: 1. Nf3 g6
Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation Accepted: 1. Nf3 g6 2. d4 Bg7 3. e4 d6 4. c4 c5 5. dxc5 Qa5+
Zukertort Opening: Basman Defense: 1. Nf3 h6
Zukertort Defense: Sicilian Knight Variation: 1. Nf3 Na6 2. e4 c5
Zukertort Opening: Drunken Cavalry Variation: 1. Nf3 Na6 2. e4 Nh6
Zukertort Opening: Black Mustang Defense: 1. Nf3 Nc6
Zukertort Defense: Kingside Variation: 1. Nf3 Nh6 2. d4 g6

A05 Réti Opening: 1...Nf6

Zukertort Opening: 1. Nf3 Nf6
Zukertort Opening: Myers Polish Attack: 1. Nf3 Nf6 2. a4 g6 3. b4
Zukertort Opening: Nimzo-Larsen Variation: 1. Nf3 Nf6 2. b3
Polish Opening: Zukertort System: 1. Nf3 Nf6 2. b4
Zukertort Opening: Quiet System: 1. Nf3 Nf6 2. e3
Zukertort Opening: Lemberger Gambit: 1. Nf3 Nf6 2. e4
King's Indian Attack: Spassky Variation: 1. Nf3 Nf6 2. g3 b5
King's Indian Attack: 1. Nf3 Nf6 2. g3 d5
King's Indian Attack: Symmetrical Defense: 1. Nf3 Nf6 2. g3 g6
Zukertort Opening: Double Fianchetto Attack: 1. Nf3 Nf6 2. g3 g6 3. b3 Bg7 4. Bb2 O-O 5. Bg2 d6 6. O-O
King's Indian Attack: Smyslov Variation: 1. Nf3 Nf6 2. g3 g6 3. b4
King's Indian Attack: Wahls Defense: 1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. O-O O-O 5. d3 d5
Zukertort Opening: 1. Nf3 Nf6 2. Nc3 Nc6

A06 Réti Opening: 1...d5

Zukertort Opening: Santasiere's Folly: 1. b4 d5 2. Nf3
Zukertort Opening: Tennison Gambit: 1. e4 d5 2. Nf3
Zukertort Opening: 1. Nf3 d5
Zukertort Opening: The Potato: 1. Nf3 d5 2. a4
Nimzo-Larsen Attack: Classical Variation: 1. Nf3 d5 2. b3
Zukertort Opening: Regina-Nu Gambit: 1. Nf3 d5 2. b3 c5 3. c4 dxc4 4. Nc3
Nimzo-Larsen Attack: Norfolk Gambit: 1. Nf3 d5 2. b3 c5 3. e4
Nimzo-Larsen Attack: Norfolk Gambit: 1. Nf3 d5 2. b3 Nf6 3. Bb2 c5 4. e4
Zukertort Opening: Old Indian Attack: 1. Nf3 d5 2. d3
Zukertort Opening: Pachman Gambit: 1. Nf3 d5 2. e3 c5 3. c4 dxc4 4. b3
Zukertort Opening: Reversed Mexican Defense: 1. Nf3 d5 2. Nc3
Zukertort Opening: Ampel Variation: 1. Nf3 d5 2. Rg1

A07 Réti Opening, King's Indian Attack (Barcza System):

Hungarian Opening: Wiedenhagen-Beta Gambit: 1. g3 d5 2. Nf3 g5
King's Indian Attack: 1. Nf3 d5 2. g3
King's Indian Attack: Keres Variation: 1. Nf3 d5 2. g3 Bg4
King's Indian Attack: Keres Variation: 1. Nf3 d5 2. g3 Bg4 3. Bg2 Nd7
King's Indian Attack: Sicilian Variation: 1. Nf3 d5 2. g3 c5
King's Indian Attack: Omega-Delta Gambit: 1. Nf3 d5 2. g3 e5
King's Indian Attack: Double Fianchetto: 1. Nf3 d5 2. g3 g6
King's Indian Attack: Pachman System: 1. Nf3 d5 2. g3 g6 3. Bg2 Bg7 4. O-O e5 5. d3 Ne7
King's Indian Attack: Yugoslav Variation: 1. Nf3 Nf6 2. g3 d5 3. Bg2 c6 4. O-O Bg4

A08 Réti Opening, King's Indian Attack:

King's Indian Attack: Sicilian Variation: 1. e4 e6 2. d3 d5 3. Nd2 Nf6 4. Ngf3 c5 5. g3 Nc6 6. Bg2 Be7 7. O-O O-O 8. Re1
King's Indian Attack: Sicilian Variation: 1. Nf3 d5 2. g3 c5 3. Bg2
King's Indian Attack: French Variation: 1. Nf3 d5 2. g3 c5 3. Bg2 Nc6
Zukertort Opening: Reversed Grünfeld: 1. Nf3 d5 2. g3 c5 3. Bg2 Nc6 4. d4
Zukertort Opening: Reversed Grünfeld: 1. Nf3 d5 2. g3 c5 3. Bg2 Nc6 4. d4 e6 5. O-O
Zukertort Opening: Reversed Grünfeld: 1. Nf3 d5 2. g3 c5 3. Bg2 Nc6 4. d4 Nf6
Zukertort Opening: Reversed Grünfeld: 1. Nf3 d5 2. g3 c5 3. Bg2 Nc6 4. d4 Nf6 5. O-O
King's Indian Attack: Sicilian Variation: 1. Nf3 d5 2. g3 c5 3. Bg2 Nf6 4. O-O e6 5. d3

A09 Réti Opening:

Réti Opening: 1. Nf3 d5 2. c4
Réti Opening: Zilbermints Gambit: 1. Nf3 d5 2. c4 b5
Réti Opening: Advance Variation: 1. Nf3 d5 2. c4 d4
Réti Opening: Advance Variation, Michel Gambit: 1. Nf3 d5 2. c4 d4 3. b4 c5
Réti Opening: Reversed Blumenfeld Gambit: 1. Nf3 d5 2. c4 d4 3. e3 c5 4. b4
Réti Opening: Penguin Variation: 1. Nf3 d5 2. c4 d4 3. Rg1
Réti Opening: Réti Gambit: 1. Nf3 d5 2. c4 dxc4
Réti Opening: Réti Gambit, Keres Variation: 1. Nf3 d5 2. c4 dxc4 3. e3 Be6

A10–A39

1.c4: English Opening

A10: 1.c4 (without: 1...g6 2.d4, 1...f5 2.d4, 1...b6 2.d4, 1...d6 2.e4, 1...d6 2.d4, 1...Nc6 2.d4)

English Opening: 1. c4
English Opening: Jaenisch Gambit: 1. c4 b5
English Opening: Anglo-Scandinavian Defense: 1. c4 d5
English Opening: Anglo-Scandinavian Defense, Löhn Gambit: 1. c4 d5 2. cxd5 e6
English Opening: Anglo-Scandinavian Defense, Schulz Gambit: 1. c4 d5 2. cxd5 Nf6
English Opening: Anglo-Scandinavian Defense, Malvinas Variation: 1. c4 d5 2. cxd5 Qxd5 3. Nc3 Qa5
English Opening: Anglo-Dutch Defense: 1. c4 f5
English Opening: Anglo-Dutch Defense, Hickmann Gambit: 1. c4 f5 2. e4
English Opening: Wade Gambit: 1. c4 f5 2. g4
English Opening: Anglo-Dutch Variation, Ferenc Gambit: 1. c4 f5 2. Nc3 Nf6 3. e4
English Opening: Porcupine Variation: 1. c4 f5 2. Nc3 Nf6 3. e4 fxe4 4. g4
English Opening: Anglo-Dutch Variation, Chabanon Gambit: 1. c4 f5 2. Nf3 d6 3. e4
English Opening: Myers Defense: 1. c4 g5
English Opening: Myers Gambit: 1. c4 g5 2. d4 Bg7
English Opening: Zilbermints Gambit: 1. c4 g5 2. d4 e5
English Opening: Great Snake Variation: 1. c4 g6
English Opening: Adorjan Defense: 1. c4 g6 2. e4 e5
English Opening: King's English Variation, Botvinnik System, Prickly Pawn Pass System: 1. c4 g6 2. Nc3 Bg7 3. g3 Nf6 4. Bg2 O-O 5. e4 d6 6. Nge2 e5 7. O-O c6 8. d3 a6
English Opening: Anglo-Lithuanian Variation: 1. c4 Nc6
English Opening: Achilles-Omega Gambit: 1. c4 Nf6 2. e4

A11 English, Caro–Kann defensive system, 1...c6 (without: 2.e4, 2.d4)

English Opening: Caro-Kann Defensive System: 1. c4 c6

A12 English, Caro–Kann defensive system: 2.Nf3 d5 3.b3

Réti Opening: Anglo-Slav Variation, London Defensive System: 1. c4 Nf6 2. g3 c6 3. Nf3 d5 4. b3 Bf5
Réti Opening: Anglo-Slav Variation, Torre System: 1. c4 Nf6 2. g3 c6 3. Nf3 d5 4. b3 Bg4
Réti Opening: Anglo-Slav Variation, Capablanca Variation: 1. c4 Nf6 2. Nf3 c6 3. b3 d5 4. Bb2 Bg4
Réti Opening: Anglo-Slav Variation, Bled Variation: 1. Nf3 d5 2. b3 Nf6 3. Bb2 g6 4. c4 c6
Réti Opening: Anglo-Slav Variation, Bogoljubow Variation: 1. Nf3 d5 2. c4 c6 3. b3
Réti Opening: Anglo-Slav Variation, Bogoljubow Variation: 1. Nf3 d5 2. c4 c6 3. b3 Bg4
Réti Opening: Anglo-Slav Variation, Bogoljubow Variation: 1. Nf3 Nf6 2. c4 c6 3. b3 d5 4. Bb2
Réti Opening: Anglo-Slav Variation, New York System: 1. Nf3 Nf6 2. c4 c6 3. b3 d5 4. Bb2 Bf5

A13 English Opening: 1...e6 (without 2.e4 or 2.d4)

English Opening: Agincourt Defense: 1. c4 e6
English Opening: Agincourt Defense: 1. c4 e6 2. Nf3
English Opening: Agincourt Defense: 1. c4 e6 2. Nf3 d5
English Opening: Agincourt Defense, Catalan Defense: 1. c4 e6 2. Nf3 d5 3. g3 b6 4. Bg2 Bb7 5. O-O
English Opening: Agincourt Defense, Catalan Defense: 1. c4 e6 2. Nf3 d5 3. g3 c5
English Opening: Agincourt Defense, Kurajica Defense: 1. c4 e6 2. Nf3 d5 3. g3 c6
English Opening: Neo-Catalan: 1. c4 e6 2. Nf3 d5 3. g3 Nf6
English Opening: Agincourt Defense, Bogoljubow Defense: 1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 Bd6
English Opening: Neo-Catalan Declined: 1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 Be7
English Opening: Agincourt Defense, Tarrasch Defense: 1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 c5 5. b3 Nc6 6. O-O Be7
English Opening: Agincourt Defense, Wimpy System: 1. c4 e6 2. Nf3 Nf6 3. b3 d5 4. Bb2 c5 5. e3
English Opening: Agincourt Defense, Catalan Defense, Semi-Slav Defense: 1. c4 e6 2. Nf3 Nf6 3. g3 d5 4. Bg2 c6
English Opening: Agincourt Defense, Catalan Defense Accepted: 1. c4 e6 2. Nf3 Nf6 3. g3 d5 4. Bg2 dxc4
English Opening: Romanishin Gambit: 1. c4 Nf6 2. Nf3 e6 3. g3 a6 4. Bg2 b5

A14 English, Neo-Catalan Declined: 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7

English Opening: Agincourt Defense, Neo-Catalan Declined: 1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 Be7 5. O-O
English Opening: Agincourt Defense, Keres Defense: 1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 Be7 5. O-O c5 6. cxd5 Nxd5 7. Nc3 Nc6
Réti Opening: Anglo-Slav Variation, Bogoljubow Variation, Stonewall Line: 1. Nf3 d5 2. c4 e6 3. g3 Nf6 4. Bg2 Be7 5. O-O O-O 6. b3 c6 7. Bb2

A15 English, Anglo-Indian Defence: 1...Nf6 (without: 2.d4, 2.g3 c6, 2.g3 e5, 2.Nf3 c5, 2.Nf3 e6, 2.Nf3 c6)

English Opening: Anglo-Indian Defense, Romanishin Variation: 1. c4 e6 2. Nf3 Nf6 3. g3 a6
English Opening: Anglo-Indian Defense, Queen's Indian Formation: 1. c4 e6 2. Nf3 Nf6 3. g3 b6 4. Bg2 Bb7
English Opening: Anglo-Indian Defense: 1. c4 Nf6
English Orangutan: 1. c4 Nf6 2. b4
English Opening: Anglo-Indian Defense, Anti-Anti-Grünfeld: 1. c4 Nf6 2. Nc3 g6 3. Nf3 Bg7 4. e4
English Opening: Anglo-Indian Defense, King's Knight Variation: 1. c4 Nf6 2. Nf3
English Opening: Anglo-Indian Defense, Queen's Indian Formation: 1. c4 Nf6 2. Nf3 b6
English Opening: Anglo-Indian Defense, Scandinavian Defense: 1. c4 Nf6 2. Nf3 d5
English Opening: Anglo-Indian Defense, Scandinavian Defense, Exchange Variation: 1. c4 Nf6 2. Nf3 d5 3. cxd5 Nxd5
English Opening: Anglo-Indian Defense, Old Indian Formation: 1. c4 Nf6 2. Nf3 d6
English Opening: Anglo-Indian Defense, King's Indian Formation: 1. c4 Nf6 2. Nf3 g6
English Opening: Anglo-Indian Defense, King's Indian Formation, Double Fianchetto: 1. c4 Nf6 2. Nf3 g6 3. g3 b6 4. Bg2 Bb7
English Opening: Anglo-Indian Defense, Slav Formation: 1. c4 Nf6 2. Nf3 g6 3. g3 c6
English Opening: Anglo-Indian Defense, Grünfeld Formation: 1. c4 Nf6 2. Nf3 g6 3. g3 d5

A16 English Opening, Anglo-Indian Defence: 2.Nc3 (without: 2...c5, 2...e5, 2...e6)

English Opening: Anglo-Indian Defense, Queen's Knight Variation: 1. c4 Nf6 2. Nc3
English Opening: Anglo-Grünfeld Defense: 1. c4 Nf6 2. Nc3 d5
English Opening: Anglo-Indian Defense, Anglo-Grünfeld Variation: 1. c4 Nf6 2. Nc3 d5 3. cxd5 Nxd5 4. g3 g6 5. Bg2 Nb6
English Opening: Anglo-Indian Defense, Anglo-Grünfeld Variation: 1. c4 Nf6 2. Nc3 d5 3. cxd5 Nxd5 4. g3 g6 5. Bg2 Nxc3
English Opening: Anglo-Indian Defense, Anglo-Grünfeld Variation: 1. c4 Nf6 2. Nc3 d5 3. cxd5 Nxd5 4. Nf3
English Opening: Anglo-Indian Defense, Anglo-Grünfeld Variation: 1. c4 Nf6 2. Nc3 d5 3. cxd5 Nxd5 4. Nf3 g6
English Opening: Anglo-Grünfeld Defense, Korchnoi Variation: 1. c4 Nf6 2. Nc3 d5 3. cxd5 Nxd5 4. Nf3 g6 5. g3 Bg7 6. Bg2 e5

A17 English Opening, Hedgehog Defence: 2...e6 (without: 3.d4, 3.Nf3 c5, 3...d5 4.d4, 3...b5 4.d4, 3...Bb4 4.d4)

English Opening: Anglo-Indian Defense, Queen's Indian Formation: 1. c4 e6 2. Nc3 Nf6 3. Nf3 b6
English Opening: Anglo-Indian Defense, Queen's Indian Variation: 1. c4 e6 2. Nc3 Nf6 3. Nf3 b6 4. e4 Bb7 5. Bd3
English Opening: Anglo-Indian Defense, Zvjaginsev-Krasenkow Attack: 1. c4 e6 2. Nc3 Nf6 3. Nf3 Bb4 4. g4
English Opening: Anglo-Indian Defense, Hedgehog System: 1. c4 Nf6 2. Nc3 e6
English Opening: Anglo-Indian Defense, Nimzo-English: 1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4

A18 English, Mikenas–Carls Variation: 3.e4 (without: 3...c5)

English Opening: Mikenas-Carls Variation: 1. c4 e6 2. Nc3 Nf6 3. e4
English Opening: Mikenas-Carls Variation: 1. c4 e6 2. Nc3 Nf6 3. e4 d5 4. e5
English Opening: Mikenas-Carls Variation: 1. c4 e6 2. Nc3 Nf6 3. e4 Nc6

A19 English, Mikenas–Carls, Sicilian Variation: 3...c5

English Opening: Mikenas-Carls, Sicilian: 1. c4 e6 2. Nc3 Nf6 3. e4 c5
English Opening: Anglo-Indian Defense, Flohr-Mikenas-Carls Variation, Nei Gambit: 1. c4 e6 2. Nc3 Nf6 3. e4 c5 4. e5 Ng8

A20 English Opening: 1...e5 (without: 2.e4, 2.Nf3 Nc6 3.Nc3, 2.Nf3 Nf6 3.Nc3, 2.Nf3 d6 3.Nc3)

English Opening: King's English Variation: 1. c4 e5
English Opening: King's English Variation, Kahiko-Hula Gambit: 1. c4 e5 2. e3 Nf6 3. f4 exf4 4. Nf3
English Opening: Drill Variation: 1. c4 e5 2. g3 h5
English Opening: King's English Variation, Nimzowitsch Variation: 1. c4 e5 2. Nf3
English Opening: King's English Variation, Nimzowitsch-Flohr Variation: 1. c4 e5 2. Nf3 e4

A21 English Opening: 2.Nc3 (without: 2...Nf6, 2...Nc6, 2...Bb4 3.g3 Nf6, 2...Bb4 3.Nf3 Nc6 2...Bb4 3.e3 Nf6)

English Opening: King's English Variation, Reversed Sicilian: 1. c4 e5 2. Nc3
English Opening: King's English Variation, Kramnik-Shirov Counterattack: 1. c4 e5 2. Nc3 Bb4
English Opening: King's English Variation, Keres Defense: 1. c4 e5 2. Nc3 d6 3. g3 c6
English Opening: King's English Variation: 1. c4 e5 2. Nc3 d6 3. Nf3
English Opening: King's English Variation, Smyslov Defense: 1. c4 e5 2. Nc3 d6 3. Nf3 Bg4
English Opening: King's English Variation, Troger Defense: 1. c4 e5 2. Nc3 Nc6 3. g3 d6 4. Bg2 Be6

A22 English Opening: 2...Nf6 (without: 3.Nf3 Nc6, 3.e3 Nc6, 3.g3 Nc6, 3.g3 c6, 3.g3 g6, 3.e4 Nc6 4.Nf3)

English Opening: King's English Variation, Two Knights Variation: 1. c4 e5 2. Nc3 Nf6
English Opening: King's English, Mazedonisch: 1. c4 e5 2. Nc3 Nf6 3. f4
English Opening: Carls-Bremen System: 1. c4 e5 2. Nc3 Nf6 3. g3
English Opening: King's English Variation, Two Knights Variation, Smyslov System: 1. c4 e5 2. Nc3 Nf6 3. g3 Bb4
English Opening: King's English Variation, Two Knights Variation, Reversed Dragon: 1. c4 e5 2. Nc3 Nf6 3. g3 d5
English Opening: King's English Variation, Bellon Gambit: 1. c4 e5 2. Nc3 Nf6 3. Nf3 e4 4. Ng5 b5
English Opening: King's English Variation, Adhiban Gambit: 1. c4 e5 2. Nc3 Nf6 3. Nf3 e4 4. Ng5 c6
English Opening: King's English, Erbenheimer Gambit: 1. c4 e5 2. Nc3 Nf6 3. Nf3 e4 4. Ng5 Ng4

A23 English Opening, Bremen System, Keres Variation: 3.g3 c6

English Opening: King's English Variation, Two Knights Variation, Keres Variation: 1. c4 e5 2. Nc3 Nf6 3. g3 Bc5 4. Bg2 c6
English Opening: King's English Variation, Two Knights Variation, Keres Variation: 1. c4 e5 2. Nc3 Nf6 3. g3 c6

A24 English Opening, Bremen System with 1...e5 2.Nc3 Nf6 3.g3 g6 (without: 4.Bg2 Bg7 5.d3 d6): 3.g3 g6

English Opening: King's English Variation, Two Knights Variation, Fianchetto Line: 1. c4 e5 2. Nc3 Nf6 3. g3 g6

A25 English Opening, Sicilian Reversed: 2...Nc6 (without 3.e3 Nf6 4.Nf3)

English Opening: King's English Variation, Reversed Closed Sicilian: 1. c4 e5 2. Nc3 Nc6
English Opening: King's English Variation, Taimanov Variation: 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7
English Opening: King's English Variation, Closed System: 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3
English Opening: King's English Variation, Bremen-Hort Variation: 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. e3 d6 6. Nge2 Be6
English Opening: Closed, Taimanov Variation: 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. e3 d6 6. Nge2 Nh6
English Opening: King's English Variation, Hungarian Attack: 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Rb1
English Opening: Closed, Taimanov Variation: 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Rb1 Nh6 5. Bg2 Bg7

A26 English Opening, Closed System: 3.g3 g6 4.Bg2 Bg7 5.d3 d6

English Opening: King's English Variation, Closed System, Full Symmetry: 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6
English Opening: King's English Variation, Botvinnik System: 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. e4

A27 English Opening, Three Knights System: 3.Nf3 (without: 3...Nf6)

English Opening: King's English Variation, Three Knights System: 1. c4 e5 2. Nc3 Nc6 3. Nf3

A28 English Opening, Four Knights System: 3...Nf6 (without 4.g3)

English Opening: King's English Variation, Four Knights Variation: 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6
English Opening: King's English Variation, Four Knights Variation, Korchnoi Line: 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. a3
English Opening: King's English Variation, Four Knights Variation, Flexible Line: 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d3
English Opening: King's English Variation, Four Knights Variation, Bradley Beach Variation: 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d4 e4
English Opening: King's English Variation, Four Knights Variation: 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5
English Opening: King's English Variation, Four Knights Variation, Quiet Line: 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3
English Opening: King's English Variation, Four Knights Variation, Quiet Line: 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 Bxc3
English Opening: King's English Variation, Four Knights Variation, Quiet Line: 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e3 Bb4 5. Qc2 O-O 6. Nd5 Re8 7. Qf5
English Opening: Four Knights System, Nimzowitsch Variation: 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e4

A29 English Opening, Four Knights, Kingside Fianchetto: 4.g3

English Opening: King's English Variation, Four Knights Variation, Fianchetto Line: 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6
English Opening: King's English Variation, Four Knights Variation, Fianchetto Line: 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. d3
English Opening: King's English Variation, Four Knights Variation, Fianchetto Line: 1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 6. d3 Be7 7. O-O O-O
English Opening: King's English Variation, Four Knights Variation, Fianchetto Line: 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3
English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with Bc5: 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Bc5
English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with Nb6: 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nb6

A30 English Opening, Symmetrical Defence: 1...c5 (without: 2.e4, 2.g3 g6 3.Nc3, 2.g3 Nc6 3.Nc3, 2.Nf3 Nc6 3.Nc3, 2.e3 Nf6 4.d4)

English Opening: Symmetrical Variation: 1. c4 c5
English Opening: Wing Gambit: 1. c4 c5 2. b4
English Opening: Symmetrical Variation: 1. c4 c5 2. Nf3
English Opening: Symmetrical Variation, Napolitano Gambit: 1. c4 c5 2. Nf3 Nf6 3. b4
English Opening: Symmetrical, Hedgehog, Flexible Formation: 1. c4 e6 2. Nf3 c5 3. Nc3 Nf6 4. g3 b6 5. Bg2 Bb7 6. O-O Be7 7. d4 cxd4 8. Qxd4 d6 9. Rd1 a6 10. b3 Nbd7
English Opening: Symmetrical Variation, Hedgehog Defense: 1. c4 e6 2. Nf3 Nf6 3. Nc3 c5 4. g3 b6 5. Bg2 Bb7 6. O-O Be7

A31 English Opening, Symmetrical, Benoni formation: 2.Nf3 Nf6 3.d4 (without: 3...cxd4 4.Nxd4 e6, 3...cxd4 4.Nxd4 a6 5.Nc3 e6, 3...cxd4 4.Nxd4 Nc6 5.Nc3 e6)

English Opening: Symmetrical Variation, Anti-Benoni Variation: 1. c4 Nf6 2. d4 c5 3. Nf3

A32 English Opening, Symmetrical: 3...cxd4 4.Nxd4 e6

English Opening: Symmetrical Variation, Anti-Benoni Variation, Spielmann Defense: 1. c4 e6 2. d4 c5 3. Nf3 cxd4 4. Nxd4 Nf6

A33 English Opening, Symmetrical: 5.Nc3 Nc6

English Opening: Symmetrical Variation, Anti-Benoni Variation, Spielmann Defense: 1. c4 e6 2. Nf3 Nf6 3. Nc3 c5 4. d4 cxd4 5. Nxd4 Nc6
English Opening: Symmetrical Variation, Anti-Benoni Variation, Geller Variation: 1. c4 e6 2. Nf3 Nf6 3. Nc3 c5 4. d4 Nc6 5. g3 cxd4 6. Nxd4 Qb6

A34 English Opening, Symmetrical: 2.Nc3 (without 2...Nc6, 2...Nf6 3.Nf3 Nc6, 2...Nf6 3.e4 e6, 2...e6 3.Nf3 Nf6, 4.g3 Nc6)

English Opening: Symmetrical Variation, Normal Variation: 1. c4 c5 2. Nc3
English Opening: Symmetrical Variation, Three Knights Variation: 1. c4 c5 2. Nc3 Nf6 3. Nf3
English Opening: Symmetrical Variation, Fianchetto Variation: 1. c4 Nf6 2. Nc3 c5 3. g3
English Opening: Symmetrical Variation, Rubinstein Variation: 1. c4 Nf6 2. Nc3 c5 3. g3 d5 4. cxd5 Nxd5 5. Bg2 Nc7

A35 English Opening, Symmetrical: 2...Nc6 (without 3.g3, 3.e4, 3.Nf3 Nf6, 4.g3 e6, 3.Nf3 Nf6 4.d4 cxd4 5.Nxd4, 3.Nf3 e5 4.g3 g6 5.Bg2 Bg7)

English Opening: Symmetrical Variation, Two Knights Variation: 1. c4 c5 2. Nc3 Nc6
English Opening: Symmetrical Variation, Four Knights Variation: 1. c4 Nf6 2. Nf3 c5 3. Nc3 Nc6

A36 English Opening, Symmetrical: 3.g3

English Opening: Symmetrical Variation, Botvinnik System: 1. c4 c5 2. e4 Nc6 3. Nc3 g6 4. g3 Bg7 5. Bg2
English Opening: Symmetrical Variation, Ultra-Symmetrical Variation: 1. c4 c5 2. g3 g6 3. Bg2 Bg7 4. Nc3 Nc6
English Opening: Symmetrical Variation, Two Knights, Fianchetto Variation: 1. c4 c5 2. Nc3 Nc6 3. g3
English Opening: Symmetrical Variation, Botvinnik System Reversed, with e3: 1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. e3 e5

A37 English Opening, Symmetrical: 3...g6 4.Bg2 Bg7 5.Nf3

English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation: 1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3
English Opening: Symmetrical Variation, Botvinnik System Reversed, with Nf3: 1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3 e5

A38 English Opening, Symmetrical: 5...Nf6

English Opening: Symmetrical Variation, Double Fianchetto: 1. c4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nf3 Nf6 6. O-O O-O 7. b3
English Opening: Symmetrical Variation, Full Symmetry Line: 1. c4 Nf6 2. Nf3 c5 3. Nc3 Nc6 4. g3 g6 5. Bg2 Bg7
English Opening: Symmetrical Variation, Duchamp Variation: 1. c4 Nf6 2. Nf3 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O c5 6. Nc3 Nc6 7. d3

A39 English, symmetrical, main line with d4: 6.0-0 0-0 7.d4 or 6.d4 cxd4 7.Nxd4 0-0 8.0-0

English Opening: Symmetrical Variation, Mecking Variation: 1. c4 Nf6 2. Nf3 c5 3. Nc3 Nc6 4. g3 g6 5. Bg2 Bg7 6. O-O O-O 7. d4

A40–A44

1.d4 without 1...d5, 1...Nf6 or 1...f5: Atypical replies to 1.d4 A40 Queen's Pawn Game

English Defense: Hartlaub Gambit Declined: 1. c4 e6 2. d4 b6 3. Nc3 Bb7 4. e4 f5 5. d5
English Defense: Hartlaub Gambit Accepted: 1. c4 e6 2. d4 b6 3. Nc3 Bb7 4. e4 f5 5. exf5 Nf6
Queen's Pawn Game: 1. d4
Polish Defense: 1. d4 b5
Polish Defense: Spassky Gambit Accepted: 1. d4 b5 2. e4 Bb7 3. Bxb5
English Defense: 1. d4 b6
English Defense: Eastbourne Gambit: 1. d4 b6 2. c4 Bb7 3. Nc3 e5
Queen's Pawn Game: Anglo-Slav Opening: 1. d4 c6 2. c4 d6
Slav Indian: Kudischewitsch Gambit: 1. d4 c6 2. Nf3 Nf6 3. c4 b5
Englund Gambit: 1. d4 e5
Englund Gambit Declined: 1. d4 e5 2. d5
Englund Gambit Declined: Diemer Counterattack: 1. d4 e5 2. d5 Bc5 3. e4 Qh4
Englund Gambit: Hartlaub-Charlick Gambit: 1. d4 e5 2. dxe5 d6
Englund Gambit: Soller Gambit: 1. d4 e5 2. dxe5 f6
Englund Gambit: Felbecker Gambit: 1. d4 e5 2. dxe5 Nc6 3. Nf3 Bc5
Englund Gambit: Soller Gambit Deferred: 1. d4 e5 2. dxe5 Nc6 3. Nf3 f6
Englund Gambit: Zilbermints Gambit: 1. d4 e5 2. dxe5 Nc6 3. Nf3 Nge7
Englund Gambit: Main Line: 1. d4 e5 2. dxe5 Nc6 3. Nf3 Qe7
Englund Gambit: Stockholm Variation: 1. d4 e5 2. dxe5 Nc6 3. Nf3 Qe7 4. Qd5
Englund Gambit: Mosquito Gambit: 1. d4 e5 2. dxe5 Qh4
Englund Gambit Declined: Reversed French: 1. d4 e5 2. e3
Englund Gambit Declined: Reversed Alekhine: 1. d4 e5 2. Nf3
Englund Gambit Declined: Reversed Krebs: 1. d4 e5 2. Nf3 e4
Englund Gambit Declined: Reversed Mokele Mbembe: 1. d4 e5 2. Nf3 e4 3. Ne5
Englund Gambit Declined: Reversed Brooklyn: 1. d4 e5 2. Nf3 e4 3. Ng1
Horwitz Defense: 1. d4 e6
English Defense: 1. d4 e6 2. c4 b6
English Defense: Perrin Variation: 1. d4 e6 2. c4 b6 3. e4 Bb7 4. Bd3 Nc6
English Defense: Poli Gambit: 1. d4 e6 2. c4 b6 3. e4 Bb7 4. f3 f5 5. exf5 Nh6
Kangaroo Defense: 1. d4 e6 2. c4 Bb4+
Kangaroo Defense: Keres Defense, Transpositional Variation: 1. d4 e6 2. c4 Bb4+ 3. Nc3
Benoni Defense: Franco-Sicilian Hybrid: 1. d4 e6 2. c4 c5 3. d5 exd5 4. cxd5 d6 5. Nc3 g6 6. e4 Bg7 7. Nf3 Ne7
Horwitz Defense: Zilbermints Gambit: 1. d4 e6 2. c4 e5
Borg Defense: Borg Gambit: 1. d4 g5
Queen's Pawn Game: Modern Defense: 1. d4 g6
Pterodactyl Defense: Central, Benoni Pterodactyl: 1. d4 g6 2. c4 Bg7 3. e4 c5 4. d5 Qa5+
Modern Defense: Beefeater Variation: 1. d4 g6 2. c4 Bg7 3. Nc3 c5 4. d5 Bxc3+ 5. bxc3 f5
Pterodactyl Defense: Fianchetto, Queen Pteranodon: 1. d4 g6 2. c4 Bg7 3. Nc3 c5 4. d5 Bxc3+ 5. bxc3 Qa5
Pterodactyl Defense: Central, Benoni Beefeater Pterodactyl: 1. d4 g6 2. c4 Bg7 3. Nc3 c5 4. d5 d6 5. e4 Bxc3+ 6. bxc3 Qa5
Pterodactyl Defense: Fianchetto, Queen Benoni Pterodactyl: 1. d4 g6 2. c4 Bg7 3. Nc3 c5 4. d5 Qa5
Pterodactyl Defense: Queen Pterodactyl, Quiet Line: 1. d4 g6 2. c4 Bg7 3. Nc3 c5 4. e3
Modern Defense: Lizard Defense, Pirc-Diemer Gambit: 1. d4 g6 2. h4 Nf6 3. h5
Colle System: Siroccopteryx Variation: 1. d4 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 cxd4 5. Nxd4 Qa5+
Colle System: Pterodactyl Variation: 1. d4 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 Qa5+
Pterodactyl Defense: Fianchetto, Queen Pterodactyl: 1. d4 g6 2. Nf3 Bg7 3. g3 c5 4. Bg2 Qa5+
Australian Defense: 1. d4 Na6
Mikenas Defense: 1. d4 Nc6
Mikenas Defense: Lithuanian Variation: 1. d4 Nc6 2. c4 e5 3. d5 Nce7
Mikenas Defense: Cannstatter Variation: 1. d4 Nc6 2. c4 e5 3. d5 Nd4
Mikenas Defense: Pozarek Gambit: 1. d4 Nc6 2. c4 e5 3. dxe5 Nxe5 4. Nc3 Nxc4
Montevideo Defense: 1. d4 Nc6 2. d5 Nb8
Zaire Defense: 1. d4 Nc6 2. d5 Nb8 3. e4 Nf6 4. e5 Ng8

A41 Queen's Pawn Game: 1...d6

Queen's Pawn Game: 1. d4 d6
Old Indian Defense: 1. d4 d6 2. c4
Rat Defense: English Rat: 1. d4 d6 2. c4 e5
Rat Defense: English Rat, Pounds Gambit: 1. d4 d6 2. c4 e5 3. dxe5 Be6
Rat Defense: English Rat, Lisbon Gambit: 1. d4 d6 2. c4 e5 3. dxe5 Nc6
Wade Defense: 1. d4 d6 2. Nf3 Bg4
Zukertort Opening: Wade Defense, Chigorin Plan: 1. d4 d6 2. Nf3 Bg4 3. c4 Nd7 4. Qb3 Rb8
Robatsch Defense: 1. d4 d6 2. Nf3 g6 3. c4 Bg7 4. e4 Bg4
Modern Defense: Neo-Modern Defense: 1. d4 g6 2. c4 Bg7 3. e4 e5
Modern Defense: 1. d4 g6 2. c4 Bg7 3. Nc3 d6

A42 Modern Defence, Averbakh System, also Wade Defence: 2.c4 g6 3.Nc3 Bg7 4.e4

Modern Defense: Averbakh Variation, Pseudo-Sämisch: 1. d4 g6 2. c4 Bg7 3. e4 d6 4. Be3 Nf6 5. f3
Pterodactyl Defense: Central, Bogolubovia: 1. d4 g6 2. c4 Bg7 3. e4 d6 4. Nc3 c5 5. Nge2 Qa5
Modern Defense: Averbakh System: 1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4
Modern Defense: Randspringer Variation: 1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4 f5
Modern Defense: Kotov Variation: 1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4 Nc6
Pterodactyl Defense: 1. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qa5+ 5. Nc3 d6

A43 Old Benoni Defence: 1...c5

Benoni Defense: Old Benoni: 1. d4 c5
Benoni Defense: Zilbermints-Benoni Gambit: 1. d4 c5 2. b4
Queen's Pawn Game: Liedmann Gambit: 1. d4 c5 2. c4 cxd4 3. e3
Benoni Defense: Old Benoni: 1. d4 c5 2. d5
Benoni Defense: Old Benoni: 1. d4 c5 2. d5 d6
Benoni Defense: Old Benoni, Schmid Variation: 1. d4 c5 2. d5 d6 3. Nc3 g6
Benoni Defense: Old Benoni, Mujannah Formation: 1. d4 c5 2. d5 f5
Benoni Defense: Benoni-Staunton Gambit: 1. d4 c5 2. d5 f5 3. e4
Benoni Defense: Snail Variation: 1. d4 c5 2. d5 Na6
Benoni Defense: Benoni-Indian Defense: 1. d4 c5 2. d5 Nf6
Benoni Defense: Woozle: 1. d4 c5 2. d5 Nf6 3. Nc3 Qa5
Benoni Defense: Benoni Gambit Accepted: 1. d4 c5 2. dxc5
Benoni Defense: Cormorant Gambit: 1. d4 c5 2. dxc5 b6
Benoni Defense: Benoni Gambit, Schlenker Defense: 1. d4 c5 2. dxc5 Na6
Benoni Defense: Zilbermints-Benoni Gambit: 1. d4 c5 2. Nf3 cxd4 3. b4
Benoni Defense: Zilbermints-Benoni Gambit, Tamarkin Countergambit: 1. d4 c5 2. Nf3 cxd4 3. b4 e5
Benoni Defense: Benoni-Indian Defense, Kingside Move Order: 1. d4 Nf6 2. Nf3 c5 3. d5
Indian Defense: Pseudo-Benko: 1. d4 Nf6 2. Nf3 c5 3. d5 b5
Benoni Defense: Hawk Variation: 1. d4 Nf6 2. Nf3 c5 3. d5 c4
Benoni Defense: French Benoni: 1. e4 e6 2. d4 c5 3. d5

A44 Old Benoni Defence: 2.d5 e5

Benoni Defense: Old Benoni: 1. d4 c5 2. d5 e5
Benoni Defense: Semi-Benoni: 1. d4 c5 2. d5 e5 3. e4 d6

A45–A49

1.d4 Nf6 without 2.c4: Atypical replies to 1...Nf6 A45 Queen's Pawn Game, Trompowsky Attack: 1.d4 Nf6 (without 2.Nf3)

Indian Defense: 1. d4 Nf6
Trompowsky Attack: 1. d4 Nf6 2. Bg5
Trompowsky Attack: Poisoned Pawn Variation: 1. d4 Nf6 2. Bg5 c5 3. d5 Qb6 4. Nc3
Trompowsky Attack: Classical Defense: 1. d4 Nf6 2. Bg5 e6
Trompowsky Attack: Classical Defense, Big Center Variation: 1. d4 Nf6 2. Bg5 e6 3. e4
Trompowsky Attack: Borg Variation: 1. d4 Nf6 2. Bg5 Ne4 3. Bf4 g5
Trompowsky Attack: Edge Variation: 1. d4 Nf6 2. Bg5 Ne4 3. Bh4
Trompowsky Attack: Edge Variation, Hergert Gambit: 1. d4 Nf6 2. Bg5 Ne4 3. Bh4 c6 4. Nd2 Qa5 5. c3 Nxd2 6. Qxd2 d5 7. e4
Trompowsky Attack: Edge Variation, Hergert Gambit: 1. d4 Nf6 2. Bg5 Ne4 3. Bh4 d5 4. f3 Nf6 5. Nc3 Bf5 6. e4
Trompowsky Attack: Raptor Variation: 1. d4 Nf6 2. Bg5 Ne4 3. h4
Trompowsky Attack: Raptor Variation, Hergert Gambit: 1. d4 Nf6 2. Bg5 Ne4 3. h4 Nxg5 4. hxg5 e5
Indian Defense: Pawn Push Variation: 1. d4 Nf6 2. d5
Indian Defense: Omega Gambit: 1. d4 Nf6 2. e4
Indian Defense: Omega Gambit, Arafat Gambit: 1. d4 Nf6 2. e4 Nxe4 3. Bd3 Nf6 4. Bg5
Paleface Attack: 1. d4 Nf6 2. f3
Indian Defense: Paleface Attack, Blackmar-Diemer Gambit Deferred: 1. d4 Nf6 2. f3 d5 3. e4
Indian Defense: Gedult Attack, Gedult Attack: 1. d4 Nf6 2. f3 d5 3. g4
Queen's Pawn Game: Veresov, Richter Attack: 1. d4 Nf6 2. f3 d5 3. Nc3
Canard Opening: 1. d4 Nf6 2. f4
Indian Defense: Tartakower Attack: 1. d4 Nf6 2. g3
Indian Defense: Gibbins-Weidenhagen Gambit: 1. d4 Nf6 2. g4
Indian Defense: Gibbins-Weidenhagen Gambit, Oshima Defense: 1. d4 Nf6 2. g4 e5
Indian Defense: Gibbins-Weidenhagen Gambit Accepted: 1. d4 Nf6 2. g4 Nxg4
Indian Defense: Gibbins-Weidenhagen Gambit, Stummer Gambit: 1. d4 Nf6 2. g4 Nxg4 3. e4 d6 4. Be2 Nf6 5. Nc3
Indian Defense: Gibbins-Weidenhagen Gambit, Maltese Falcon: 1. d4 Nf6 2. g4 Nxg4 3. f3 Nf6 4. e4
Indian Defense: Reversed Chigorin Defense: 1. d4 Nf6 2. Nc3 c5
Queen's Pawn Game: Chigorin Variation: 1. d4 Nf6 2. Nc3 d5
Amazon Attack: Siberian Attack: 1. d4 Nf6 2. Nc3 d5 3. Qd3
Indian Defense: Maddigan Gambit: 1. d4 Nf6 2. Nc3 e5
Indian Defense: Lazard Gambit: 1. d4 Nf6 2. Nd2 e5

A46 Queen's Pawn Game, Torre Attack: 2.Nf3

Indian Defense: Knights Variation: 1. d4 Nf6 2. Nf3
Indian Defense: Knights Variation, Alburt-Miles Variation: 1. d4 Nf6 2. Nf3 a6
Indian Defense: Polish Variation: 1. d4 Nf6 2. Nf3 b5
Indian Defense: Spielmann-Indian: 1. d4 Nf6 2. Nf3 c5
Indian Defense: Czech-Indian: 1. d4 Nf6 2. Nf3 c6
Indian Defense: Wade-Tartakower Defense: 1. d4 Nf6 2. Nf3 d6
Indian Defense: London System: 1. d4 Nf6 2. Nf3 e6 3. Bf4
Torre Attack: Classical Defense: 1. d4 Nf6 2. Nf3 e6 3. Bg5
Torre Attack: Classical Defense, Petrosian Gambit: 1. d4 Nf6 2. Nf3 e6 3. Bg5 c5 4. e3 b6 5. d5
Torre Attack: Wagner Gambit: 1. d4 Nf6 2. Nf3 e6 3. Bg5 c5 4. e4
Queen's Pawn Game: Torre Attack, Breyer Variation: 1. d4 Nf6 2. Nf3 e6 3. Bg5 d5 4. e3 c5 5. c3 Qb6
Torre Attack: Classical Defense, Nimzowitsch Variation: 1. d4 Nf6 2. Nf3 e6 3. Bg5 h6
Yusupov-Rubinstein System: 1. d4 Nf6 2. Nf3 e6 3. e3
Queen's Pawn Game: Veresov Attack, Classical Defense: 1. d4 Nf6 2. Nf3 e6 3. Nc3 d5 4. Bg5
Döry Defense: 1. d4 Nf6 2. Nf3 Ne4

A47 Queen's Indian Defence: 2...b6

Pseudo Queen's Indian Defense: 1. d4 Nf6 2. Nf3 b6
Indian Defense: Schnepper Gambit: 1. d4 Nf6 2. Nf3 b6 3. c3 e5
Marienbad System: 1. d4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2 c5
Marienbad System: Berg Variation: 1. d4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2 c5 5. c4 cxd4 6. Qxd4

A48 King's Indian, East Indian Defence: 2...g6

East Indian Defense: 1. d4 Nf6 2. Nf3 g6
London System: 1. d4 Nf6 2. Nf3 g6 3. Bf4
Torre Attack: Fianchetto Defense: 1. d4 Nf6 2. Nf3 g6 3. Bg5
Torre Attack: Fianchetto Defense, Euwe Variation: 1. d4 Nf6 2. Nf3 g6 3. Bg5 Bg7 4. Nbd2 c5
Queen's Pawn Game: Torre Attack, Grünfeld Variation, Main Line: 1. d4 Nf6 2. Nf3 g6 3. Bg5 Bg7 4. Nbd2 d5 5. e3 O-O
Indian Defense: Colle System, King's Indian Variation: 1. d4 Nf6 2. Nf3 g6 3. e3 Bg7 4. Bd3 d6
Queen's Pawn Game: Barry Attack: 1. d4 Nf6 2. Nf3 g6 3. Nc3 d5 4. Bf4
Queen's Pawn Game: Barry Attack: 1. d4 Nf6 2. Nf3 g6 3. Nc3 d5 4. Bf4 Bg7
Queen's Pawn Game: Barry Attack, Grünfeld Variation: 1. d4 Nf6 2. Nf3 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Be2
Queen's Pawn Game: Barry Attack, Tarzan Attack: 1. d4 Nf6 2. Nf3 g6 3. Nc3 d5 4. Bf4 Bg7 5. Qd2

A49 King's Indian, Fianchetto without c4: 3.g3

Indian Defense: Przepiorka Variation: 1. d4 Nf6 2. Nf3 g6 3. g3

A50–A55

1.d4 Nf6 2.c4 without 2...e6 or 2...g6: Atypical Indian systems A50 Queen's Pawn Game: 1. d4 Nf6 2.c4 (without 2...d6 2...e5, 2...e6, 2...g6 or 2...c5)

Indian Defense: Normal Variation: 1. d4 Nf6 2. c4
Indian Defense: Pyrenees Gambit: 1. d4 Nf6 2. c4 b5
Queen's Indian Accelerated: 1. d4 Nf6 2. c4 b6
Slav Indian: 1. d4 Nf6 2. c4 c6
Indian Defense: Medusa Gambit: 1. d4 Nf6 2. c4 g5
Mexican Defense: 1. d4 Nf6 2. c4 Nc6
Mexican Defense: Horsefly Gambit: 1. d4 Nf6 2. c4 Nc6 3. d5 Ne5 4. f4

A51 Budapest Gambit Declined: 2...e5

Indian Defense: Budapest Defense: 1. d4 Nf6 2. c4 e5
Indian Defense: Budapest Defense, Fajarowicz Variation: 1. d4 Nf6 2. c4 e5 3. dxe5 Ne4
Indian Defense: Budapest Defense, Fajarowicz Defense, Bonsdorf Variation: 1. d4 Nf6 2. c4 e5 3. dxe5 Ne4 4. a3 b6
Indian Defense: Budapest Defense, Fajarowicz-Steiner Variation: 1. d4 Nf6 2. c4 e5 3. dxe5 Ne4 4. Qc2

A52 Budapest Gambit: 3.dxe5 Ng4

Indian Defense: Budapest Defense: 1. d4 Nf6 2. c4 e5 3. dxe5 Ng4
Indian Defense: Budapest Defense, Rubinstein Variation: 1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. Bf4
Indian Defense: Budapest Defense, Alekhine Variation: 1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. e4
Indian Defense: Budapest Defense, Alekhine Variation, Tartakower Defense: 1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. e4 d6
Indian Defense: Budapest Defense, Alekhine Variation, Abonyi Variation: 1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. e4 Nxe5 5. f4 Nec6
Indian Defense: Budapest Defense, Adler Variation: 1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. Nf3

A53 Old Indian Defence: 2...d6

Old Indian Defense: 1. d4 Nf6 2. c4 d6
Old Indian Defense: Aged Gibbon Gambit: 1. d4 Nf6 2. c4 d6 3. g4
Old Indian Defense: Janowski Variation: 1. d4 Nf6 2. c4 d6 3. Nc3 Bf5
Old Indian Defense: Janowski Variation, Grinberg Gambit: 1. d4 Nf6 2. c4 d6 3. Nc3 Bf5 4. e4
Old Indian Defense: Janowski Variation, Main Line: 1. d4 Nf6 2. c4 d6 3. Nc3 Bf5 4. f3
Old Indian Defense: Janowski Variation, Fianchetto Variation: 1. d4 Nf6 2. c4 d6 3. Nc3 Bf5 4. g3
Old Indian Defense: Czech Variation, with Nc3: 1. d4 Nf6 2. c4 d6 3. Nc3 c6
Old Indian Defense: Czech Variation, with Nf3: 1. d4 Nf6 2. c4 d6 3. Nf3 c6

A54 Old Indian, Ukrainian Variation: 3.Nc3 e5

Old Indian Defense: Ukrainian Variation: 1. d4 Nf6 2. c4 d6 3. Nc3 e5
Old Indian Defense: Duz-Khotimirsky Variation: 1. d4 Nf6 2. c4 d6 3. Nc3 e5 4. e3 Nbd7 5. Bd3
Old Indian Defense: Two Knights Variation: 1. d4 Nf6 2. c4 d6 3. Nc3 e5 4. Nf3
Old Indian Defense: Tartakower-Indian: 1. d4 Nf6 2. c4 d6 3. Nf3 Bg4

A55 Old Indian, Main line: 4.Nf3 Nbd7 5.e4

Old Indian Defense: Normal Variation: 1. d4 Nf6 2. c4 d6 3. Nc3 Nbd7 4. e4 e5 5. Nf3

A56–A79

Benoni Defence (and Benko Gambit): 1.d4 Nf6 2.c4 c5

A56 Benoni Defence: 1.d4 Nf6 2.c4 c5

Benoni Defense: 1. d4 Nf6 2. c4 c5
Benoni Defense: Hromádka System: 1. d4 Nf6 2. c4 c5 3. d5 d6
Benoni Defense: Czech Benoni Defense: 1. d4 Nf6 2. c4 c5 3. d5 e5
Benoni Defense: King's Indian System: 1. d4 Nf6 2. c4 c5 3. d5 e5 4. Nc3 d6 5. e4 g6
Vulture Defense: 1. d4 Nf6 2. c4 c5 3. d5 Ne4
Benoni Defense: Weenink Variation: 1. d4 Nf6 2. c4 c5 3. dxc5 e6
Grünfeld Defense: Three Knights Variation, Burille Variation, Reversed Tarrasch: 1. d4 Nf6 2. c4 c5 3. e3 g6 4. Nc3 Bg7 5. Nf3 O-O 6. Be2 cxd4 7. exd4 d5 8. O-O Nc6

A57 Benko Gambit: 3.d5 b5

Benko Gambit: 1. d4 Nf6 2. c4 c5 3. d5 b5
Benko Gambit Declined: Sosonko Variation: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. a4
Benko Gambit Declined: Bishop Attack: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. Bg5
Benko Gambit Accepted: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6
Benko Gambit Accepted: Pawn Return Variation: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. b6
Benko Gambit Accepted: Modern Variation: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. e3
Benko Gambit Accepted: Dlugy Variation: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. f3
Benko Gambit: Zaitsev System: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. Nc3
Benko Gambit: Zaitsev Variation, Nescafe Frappe Attack: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. Nc3 axb5 6. e4 b4 7. Nb5
Benko Gambit: Nescafe Frappe Attack: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. Nc3 axb5 6. e4 b4 7. Nb5 d6 8. Bc4
Benko Gambit Declined: Hjørring Countergambit: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. e4
Benko Gambit Declined: Pseudo-Sämisch: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. f3
Benko Gambit: Mutkin Countergambit: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. g4
Benko Gambit Declined: Quiet Line: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. Nd2
Benko Gambit Declined: Main Line: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. Nf3

A58 Benko Gambit Accepted: 4.cxb5 a6 5.bxa6

Benko Gambit Accepted: Fully Accepted Variation: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6
Benko Gambit: Fianchetto Variation: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 Bxa6 6. Nc3 d6 7. Nf3 g6 8. g3
Benko Gambit: Nd2 Variation: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 Bxa6 6. Nc3 d6 7. Nf3 g6 8. Nd2
Benko Gambit Accepted: Central Storming Variation: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 g6 6. Nc3 Bxa6 7. f4
Benko Gambit Accepted: Fianchetto Variation: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 g6 6. Nc3 Bxa6 7. g3 d6 8. Bg2 Bg7 9. Nf3

A59 Benko Gambit, 7.e4: 5...Bxa6 6.Nc3 d6 7.e4

Benko Gambit Accepted: Yugoslav: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 Bxa6 6. Nc3 d6 7. e4
Benko Gambit: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 g6 6. Nc3 Bxa6 7. e4 Bxf1 8. Kxf1 d6 9. g3
Benko Gambit Accepted: Yugoslav: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 g6 6. Nc3 Bxa6 7. e4 Bxf1 8. Kxf1 d6 9. Nge2
Benko Gambit Accepted: King Walk Variation: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 g6 6. Nc3 Bxa6 7. Nf3 d6 8. e4 Bxf1 9. Kxf1 Bg7 10. g3 O-O 11. Kg2

A60 Benoni Defence: 3.d5 e6

Benoni Defense: Modern Variation: 1. d4 Nf6 2. c4 c5 3. d5 e6
Benoni Defense: Modern Variation, Snake Variation: 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 Bd6

A61 Benoni Defence: 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6

Benoni Defense: 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6
Benoni Defense: Uhlmann Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. Bg5
Benoni Defense: Fianchetto Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. g3
Benoni Defense: Knight's Tour Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. Nd2

A62 Benoni, Fianchetto Variation without 9...Nbd7: 7.g3 Bg7 8.Bg2 0-0

Benoni Defense: Fianchetto Variation: 1. d4 Nf6 2. c4 e6 3. g3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. Bg2 Bg7 8. Nf3 O-O

A63 Benoni, Fianchetto Variation, 9...Nbd7: 9.Nbd7

Benoni Defense: Fianchetto Variation, Hastings Defense: 1. d4 Nf6 2. c4 e6 3. g3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. Bg2 Bg7 8. Nf3 O-O 9. O-O Nbd7

A64 Benoni, Fianchetto Variation, 11...Re8: 9...Nbd7: 10.Nd2 a6 11.a4 Re8

Benoni Defense: Fianchetto Variation, Hastings Defense, Main Line: 1. d4 Nf6 2. c4 e6 3. g3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. Bg2 Bg7 8. Nf3 O-O 9. O-O a6 10. a4 Nbd7 11. Nd2 Re8

A65 Benoni, 6.e4: 4.Nc3 exd5 5.cxd5 d6 6.e4

Benoni Defense: King's Pawn Line: 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4

A66 Benoni, Pawn Storm Variation: 6...g6 7.f4

Benoni Defense: Pawn Storm Variation: 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. f4
Benoni Defense: Mikenas Variation: 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. f4 Bg7 8. e5

A67 Benoni, Taimanov Variation: 7...Bg7 8.Bb5+

Benoni Defense: Taimanov Variation: 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. f4 Bg7 8. Bb5+

A68 Benoni, Four Pawns Attack: 7...Bg7 8.Nf3 0-0

Benoni Defense: Four Pawns Attack: 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. f4 Bg7 8. Nf3 O-O

A69 Benoni, Four Pawns Attack, Main line: 9.Be2 Re8

Benoni Defense: Four Pawns Attack, Main Line: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Nf3 c5 7. d5 e6 8. Be2 exd5 9. cxd5 Re8

A70 Benoni, Classical with e4 and Nf3: 6...g6 7.Nf3

Benoni Defense: Classical Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. e4
Benoni Defense: Classical Variation, Traditional Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. e4 Bg7 8. Be2
Benoni Defense: Classical Variation, New York Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. e4 Bg7 8. h3

A71 Benoni, Classical, 8.Bg5: 7... Bg7 8.Bg5

Benoni Defense: Classical Variation, Averbakh-Grivas Attack: 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. e4 Bg7 8. Bg5

A72 Benoni, Classical without 9.0-0: 7...Bg7 8.Be2 0-0

Benoni Defense: Classical Variation: 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 O-O

A73 Benoni, Classical, 9.0-0: 9.0-0

Benoni Defense: Classical Variation, Main Line: 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 O-O 9. O-O

A74 Benoni, Classical, 9...a6, 10.a4: 9...a6 10.a4

Benoni Defense: Classical Variation, Full Line: 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 O-O 9. O-O a6 10. a4

A75 Benoni, Classical with 9...a6 and 10...Bg4: 9...a6 10.a4 Bg4

Benoni Defense: Classical Variation, Argentine Counterattack: 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. e4 Bg7 8. Be2 O-O 9. O-O a6 10. a4 Bg4

A76 Benoni, Classical, 9...Re8: 9...Re8

Benoni Defense: Classical Variation, Czerniak Defense: 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 O-O 9. O-O Re8

A77 Benoni, Classical, 9...Re8, 10.Nd2: 10.Nd2

Benoni Defense: Classical Variation, Czerniak Defense, Tal Line: 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 O-O 9. O-O Re8 10. Nd2

A78 Benoni, Classical with 9...Re8 and 10...Na6: 10...Na6

Benoni Defense: Classical Variation, Czerniak Defense: 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. e4 Bg7 8. Be2 O-O 9. O-O Re8 10. Nd2 Na6

A79 Benoni, Classical, 11.f3: 11.f3

Benoni Defense: Classical Variation, Czerniak Defense: 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 O-O 9. O-O Re8 10. Nd2 Na6 11. f3

A80–A99

Dutch Defence: 1.d4 f5 A80 Dutch Defence: 1.d4 f5

Dutch Defense: 1. d4 f5
Dutch Defense: Senechaud Gambit: 1. d4 f5 2. Bf4 e6 3. g4
Dutch Defense: Hopton Attack: 1. d4 f5 2. Bg5
Dutch Defense: Krejcik Gambit: 1. d4 f5 2. g4
Dutch Defense: Hevendehl Gambit: 1. d4 f5 2. g4 e5
Dutch Defense: Krejcik Gambit, Tate Gambit: 1. d4 f5 2. g4 fxg4 3. e4 d5 4. Nc3
Dutch Defense: Korchnoi Attack: 1. d4 f5 2. h3
Dutch Defense: Janzen-Korchnoi Gambit: 1. d4 f5 2. h3 Nf6 3. g4
Dutch Defense: Raphael Variation: 1. d4 f5 2. Nc3
Queen's Pawn Game: Veresov Attack, Dutch System: 1. d4 f5 2. Nc3 d5
Dutch Defense: Kingfisher Gambit: 1. d4 f5 2. Nc3 d5 3. e4
Dutch Defense: Spielmann Gambit: 1. d4 f5 2. Nc3 Nf6 3. g4
Dutch Defense: Omega-Isis Gambit: 1. d4 f5 2. Nf3 e5
Dutch Defense: Alapin Variation: 1. d4 f5 2. Qd3
Dutch Defense: Manhattan Gambit, Anti-Stonewall: 1. d4 f5 2. Qd3 d5 3. g4
Dutch Defense: Manhattan Gambit, Anti-Modern: 1. d4 f5 2. Qd3 d6 3. g4
Dutch Defense: Manhattan Gambit, Anti-Classical Line: 1. d4 f5 2. Qd3 e6 3. g4
Dutch Defense: Manhattan Gambit, Anti-Leningrad: 1. d4 f5 2. Qd3 g6 3. g4

A81 Dutch Defence: 2.g3

Dutch Defense: Fianchetto Attack: 1. d4 f5 2. g3
Dutch Defense: Leningrad, Basman System: 1. d4 f5 2. g3 c6 3. Bg2 g6 4. Nf3 Bg7 5. O-O Nh6
Dutch Defense: Leningrad Variation, Carlsbad Variation: 1. d4 f5 2. g3 g6 3. Bg2 Bg7 4. Nh3
Dutch Defense: Blackburne Variation: 1. d4 f5 2. g3 Nf6 3. Bg2 e6 4. Nh3
Dutch Defense: Semi-Leningrad Variation: 1. d4 f5 2. g3 Nf6 3. Bg2 g6

A82 Dutch, Staunton Gambit 2.e4

Dutch Defense: Staunton Gambit: 1. d4 f5 2. e4
Dutch Defense: Staunton Gambit Accepted: 1. d4 f5 2. e4 fxe4
Dutch Defense: Blackmar's Second Gambit: 1. d4 f5 2. e4 fxe4 3. Nc3 Nf6 4. f3
Dutch Defense: Staunton Gambit, Tartakower Variation: 1. d4 f5 2. e4 fxe4 3. Nc3 Nf6 4. g4
Dutch Defense: Staunton Gambit, American Attack: 1. d4 f5 2. e4 fxe4 3. Nd2
Rat Defense: Balogh Defense: 1. e4 d6 2. d4 f5

A83 Dutch, Staunton Gambit, Staunton's line 2.e4 fxe4 3.Nc3 Nf6 4.Bg5

Dutch Defense: Staunton Gambit: 1. d4 f5 2. e4 fxe4 3. Nc3 Nf6 4. Bg5
Dutch Defense: Staunton Gambit, Nimzowitsch Variation: 1. d4 f5 2. e4 fxe4 3. Nc3 Nf6 4. Bg5 b6
Dutch Defense: Staunton Gambit, Chigorin Variation: 1. d4 f5 2. e4 fxe4 3. Nc3 Nf6 4. Bg5 c6
Dutch Defense: Staunton Gambit, Lasker Variation: 1. d4 f5 2. e4 fxe4 3. Nc3 Nf6 4. Bg5 g6 5. f3
Dutch Defense: Staunton Gambit, Alekhine Variation: 1. d4 f5 2. e4 fxe4 3. Nc3 Nf6 4. Bg5 g6 5. h4

A84 Dutch Defence 2.c4: 2.c4

Dutch Defense: 1. d4 f5 2. c4
Dutch Defense: Classical Variation: 1. d4 f5 2. c4 e6
Dutch Defense: Bellon Gambit: 1. d4 f5 2. c4 e6 3. e4
Dutch Defense: Rubinstein Variation: 1. d4 f5 2. c4 e6 3. Nc3
Dutch Defense: Bladel Variation: 1. d4 f5 2. c4 g6 3. Nc3 Nh6
Dutch Defense: Normal Variation: 1. d4 f5 2. c4 Nf6
Dutch Defense: Krause Variation: 1. d4 f5 2. c4 Nf6 3. Nc3 d6 4. Nf3 Nc6

A85 Dutch with 2.c4 Nf6 3.Nc3: 2... Nf6 3.Nc3

Dutch Defense: Queen's Knight Variation: 1. d4 f5 2. c4 Nf6 3. Nc3

A86 Dutch with 2.c4 Nf6 3.g3: 2... Nf6 3.g3

Dutch Defense: Fianchetto Variation: 1. d4 f5 2. c4 Nf6 3. g3
Dutch Defense: Hort-Antoshin System: 1. d4 f5 2. c4 Nf6 3. g3 d6 4. Bg2 c6 5. Nc3 Qc7
Dutch Defense: Leningrad Variation: 1. d4 f5 2. c4 Nf6 3. g3 g6

A87 Dutch, Leningrad, Main Variation: 3...g6 4.Bg2 Bg7 5.Nf3

Dutch Defense: Leningrad Variation: 1. d4 f5 2. c4 Nf6 3. g3 g6 4. Bg2 Bg7 5. Nf3

A88 Dutch, Leningrad, Main Variation with 5...0-0 6.0-0 d6 7.Nc3 c6: 5...0-0 6.0-0 d6 7.Nc3 c6

Dutch Defense: Leningrad Variation, Warsaw Variation: 1. d4 f5 2. g3 Nf6 3. Bg2 g6 4. Nf3 Bg7 5. O-O O-O 6. c4 d6 7. Nc3 c6

A89 Dutch, Leningrad, Main Variation with 5...0-0 6.0-0 d6 7.Nc3 Nc6: 5...0-0 6.0-0 d6 7.Nc3 Nc6

Dutch Defense: Leningrad Variation, Matulovic Variation: 1. d4 f5 2. g3 Nf6 3. Bg2 g6 4. Nf3 Bg7 5. O-O O-O 6. c4 d6 7. Nc3 Nc6

A90 Dutch Defence 2.c4 Nf6 3.g3 e6 4.Bg2: 3...e6 4.Bg2

Dutch Defense: Stonewall Variation, Modern Variation: 1. d4 f5 2. c4 e6 3. Nf3 Nf6 4. g3 c6 5. Bg2 d5 6. O-O Bd6
Dutch Defense: Classical Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2
Dutch Defense: Nimzo-Dutch Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Bb4+
Dutch Defense: Nimzo-Dutch Variation, Alekhine Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Bb4+ 5. Bd2 Be7
Dutch Defense: Classical Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 d5 5. Nf3

A91 Dutch Defence 2.c4 Nf6 3.g3 e6 4.Bg2 Be7: 4...Be7

Dutch Defense: Classical Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7
Dutch Defense: Classical Variation, Blackburne Attack: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nh3

A92 Dutch Defence 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0: 5.Nf3 0-0

Dutch Defense: Classical Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O
Dutch Defense: Stonewall Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d5
Dutch Defense: Stonewall Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d5 7. Nc3
Dutch Defense: Alekhine Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O Ne4

A93 Dutch, Stonewall, Botvinnik Variation 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d5 7. b3: 6.0-0 d5 7. b3

Dutch Defense: Stonewall Variation, Botvinnik Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d5 7. b3

A94 Dutch, Stonewall with 6.0-0 d5.7.b3 c6 8.Ba3: 7... c6 8.Ba3

Dutch Defense: Stonewall Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d5 7. b3 c6 8. Ba3

A95 Dutch, Stonewall with 6.0-0 d5.7.Nc3 c6: 6.0-0 d5 7.Nc3 c6

Dutch Defense: Stonewall Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d5 7. Nc3 c6
Dutch Defense: Stonewall Variation, Chekhover Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d5 7. Nc3 c6 8. Qc2 Qe8 9. Bg5

A96 Dutch, Classical Variation 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d6: 6.0-0 d6

Dutch Defense: Classical Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d6
Dutch Defense: Classical Variation, Buenos Aires Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d6 7. Nc3 a5
Dutch Defense: Classical Variation, Huisl Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d6 7. Nc3 Ne4

A97 Dutch, Ilyin–Genevsky Variation 7.Nc3 Qe8: 7.Nc3 Qe8

Dutch Defense: Classical Variation, Ilyin-Zhenevsky Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d6 7. Nc3 Qe8
Dutch Defense: Classical Variation, Ilyin-Zhenevsky Variation, Winter Variation: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d6 7. Nc3 Qe8 8. Re1

A98 Dutch, Ilyin–Genevsky Variation with 7.Nc3 Qe8 8.Qc2: 8.Qc2

Dutch Defense: Classical Variation, Ilyin-Zhenevsky Variation, Alatortsev-Lisitsyn Line: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d6 7. Nc3 Qe8 8. Qc2

A99 Dutch, Ilyin–Genevsky Variation with 7.Nc3 Qe8 8.b3: 8.b3

Dutch Defense: Classical Variation, Ilyin-Zhenevsky Variation, Modern Main Line: 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d6 7. Nc3 Qe8 8. b3

B – Semi-Open Games other than the French Defence

1.e4 without 1...c5, 1...e6 or 1...e5 (B00–B19)
1.e4 c5: Sicilian Defence (B20–B99)

B00–B19

1.e4 without 1...c5, 1...e6 or 1...e5 B00 King's Pawn Opening without 1...e5, 1...e6, 1...d5, 1...Nf6, 1...g6, 1...d6, 1...c6, 1...c5.

King's Pawn Game: 1. e4
Ware Defense: 1. e4 a5
Ware Defense: Snagglepuss Defense: 1. e4 a5 2. d4 Nc6
St. George Defense: 1. e4 a6
St. George Defense: San Jorge Variation: 1. e4 a6 2. d4 b5 3. Nf3 Bb7 4. Bd3 d6 5. O-O g6 6. c3 Bg7
St. George Defense: Polish Variation: 1. e4 a6 2. d4 b5 3. Nf3 Bb7 4. Bd3 e6
St. George Defense: Zilbermints Gambit: 1. e4 a6 2. d4 e5
Owen Defense: 1. e4 b6
Guatemala Defense: 1. e4 b6 2. d4 Ba6
Owen Defense: Matovinsky Gambit: 1. e4 b6 2. d4 Bb7 3. Bd3 f5 4. exf5 Bxg2 5. Qh5+ g6
Owen Defense: Naselwaus Gambit: 1. e4 b6 2. d4 Bb7 3. Bg5
Owen Defense: Wind Gambit: 1. e4 b6 2. d4 Bb7 3. f3 e5
Owen Defense: Smith Gambit: 1. e4 b6 2. d4 Bb7 3. Nf3
Owen Defense: Hekili-Loa Gambit: 1. e4 b6 2. d4 c5 3. dxc5 Nc6
Pirc Defense: 1. e4 d6
Pirc Defense: 1. e4 d6 2. d4
Rat Defense: Antal Defense: 1. e4 d6 2. d4 Nd7
Pirc Defense: 1. e4 d6 2. d4 Nf6
Lion Defense: Lion's Jaw: 1. e4 d6 2. d4 Nf6 3. f3
Pirc Defense: Roscher Gambit: 1. e4 d6 2. d4 Nf6 3. Nf3
Rat Defense: Harmonist: 1. e4 d6 2. f4
Rat Defense: Fuller Gambit: 1. e4 d6 2. f4 d5 3. exd5 Nf6
Rat Defense: Spike Attack: 1. e4 d6 2. g4
Rat Defense: Petruccioli Attack: 1. e4 d6 2. h4
Duras Gambit: 1. e4 f5
Barnes Defense: 1. e4 f6
Owen Defense: Unicorn Variation: 1. e4 f6 2. d4 b6 3. c4 Bb7
Fried Fox Defense: 1. e4 f6 2. d4 Kf7
Borg Defense: 1. e4 g5
Borg Defense: Borg Gambit: 1. e4 g5 2. d4 Bg7
Borg Defense: Zilbermints Gambit: 1. e4 g5 2. d4 e5
Borg Defense: Troon Gambit: 1. e4 g5 2. d4 h6 3. h4 g4
Goldsmith Defense: 1. e4 h5
Goldsmith Defense: Picklepuss Defense: 1. e4 h5 2. d4 Nf6
Carr Defense: 1. e4 h6
Carr Defense: Zilbermints Gambit: 1. e4 h6 2. d4 e5
Lemming Defense: 1. e4 Na6
Nimzowitsch Defense: 1. e4 Nc6
Nimzowitsch Defense: Wheeler Gambit: 1. e4 Nc6 2. b4
Nimzowitsch Defense: Pseudo-Spanish Variation: 1. e4 Nc6 2. Bb5
Nimzowitsch Defense: 1. e4 Nc6 2. d4
Nimzowitsch Defense: Woodchuck Variation: 1. e4 Nc6 2. d4 a6
Nimzowitsch Defense: Scandinavian Variation: 1. e4 Nc6 2. d4 d5
Nimzowitsch Defense: Hornung Gambit: 1. e4 Nc6 2. d4 d5 3. Be3
Nimzowitsch Defense: Scandinavian Variation, Advance Variation: 1. e4 Nc6 2. d4 d5 3. e5
Nimzowitsch Defense: Scandinavian Variation, Aachen Gambit: 1. e4 Nc6 2. d4 d5 3. exd5 Nb4
Nimzowitsch Defense: Scandinavian Variation, Exchange Variation: 1. e4 Nc6 2. d4 d5 3. exd5 Qxd5
Nimzowitsch Defense: Scandinavian Variation, Exchange Variation, Marshall Gambit: 1. e4 Nc6 2. d4 d5 3. exd5 Qxd5 4. Nc3
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation: 1. e4 Nc6 2. d4 d5 3. Nc3
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Brandics Gambit: 1. e4 Nc6 2. d4 d5 3. Nc3 a6
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation: 1. e4 Nc6 2. d4 d5 3. Nc3 dxe4
Van Geet Opening: Berlin Gambit: 1. e4 Nc6 2. d4 d5 3. Nc3 dxe4 4. d5
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Richter Gambit: 1. e4 Nc6 2. d4 d5 3. Nc3 dxe4 4. d5 Nb8 5. f3
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Nimzowitsch Gambit: 1. e4 Nc6 2. d4 d5 3. Nc3 dxe4 4. d5 Ne5
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Heinola-Deppe Gambit: 1. e4 Nc6 2. d4 d5 3. Nc3 e5
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Erben Gambit: 1. e4 Nc6 2. d4 d5 3. Nc3 g6
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Vehre Variation: 1. e4 Nc6 2. d4 d5 3. Nc3 Nf6
Nimzowitsch Defense: Mikenas Variation: 1. e4 Nc6 2. d4 d6
Nimzowitsch Defense: Kennedy Variation: 1. e4 Nc6 2. d4 e5
Nimzowitsch Defense: Kennedy Variation, Linksspringer Variation: 1. e4 Nc6 2. d4 e5 3. d5
Nimzowitsch Defense: Kennedy Variation, Bielefelder Gambit: 1. e4 Nc6 2. d4 e5 3. dxe5 Bc5
Nimzowitsch Defense: Kennedy Variation, de Smet Gambit: 1. e4 Nc6 2. d4 e5 3. dxe5 d6
Nimzowitsch Defense: Kennedy Variation, Hammer Gambit: 1. e4 Nc6 2. d4 e5 3. dxe5 f6
Nimzowitsch Defense: Kennedy Variation, Riemann Defense: 1. e4 Nc6 2. d4 e5 3. dxe5 Nxe5 4. f4 Nc6
Nimzowitsch Defense: Kennedy Variation, Main Line: 1. e4 Nc6 2. d4 e5 3. dxe5 Nxe5 4. f4 Ng6
Nimzowitsch Defense: Kennedy Variation, Keres Attack: 1. e4 Nc6 2. d4 e5 3. dxe5 Nxe5 4. Nc3
Nimzowitsch Defense: Kennedy Variation, Paulsen Attack: 1. e4 Nc6 2. d4 e5 3. dxe5 Nxe5 4. Nf3
Nimzowitsch Defense: Kennedy Variation, Herford Gambit: 1. e4 Nc6 2. d4 e5 3. dxe5 Qh4
Nimzowitsch Defense: Neo-Mongoloid Defense: 1. e4 Nc6 2. d4 f6
Nimzowitsch Defense: French Connection: 1. e4 Nc6 2. Nc3 e6
Nimzowitsch Defense: Pirc Connection: 1. e4 Nc6 2. Nc3 g6
Nimzowitsch Defense: Breyer Variation: 1. e4 Nc6 2. Nc3 Nf6 3. d4 e5
Nimzowitsch Defense: Declined Variation: 1. e4 Nc6 2. Nf3
Nimzowitsch Defense: Williams Variation: 1. e4 Nc6 2. Nf3 d6
Nimzowitsch Defense: Franco-Nimzowitsch Variation: 1. e4 Nc6 2. Nf3 e6
Nimzowitsch Defense: Colorado Countergambit: 1. e4 Nc6 2. Nf3 f5
Nimzowitsch Defense: Colorado Countergambit Accepted: 1. e4 Nc6 2. Nf3 f5 3. exf5
Nimzowitsch Defense: El Columpio Defense: 1. e4 Nc6 2. Nf3 Nf6 3. e5 Ng4
Nimzowitsch Defense: El Columpio Defense, Pin Variation: 1. e4 Nc6 2. Nf3 Nf6 3. e5 Ng4 4. d4 d6 5. h3 Nh6 6. Bb5
Nimzowitsch Defense: El Columpio Defense, El Columpio Gambit: 1. e4 Nc6 2. Nf3 Nf6 3. e5 Ng4 4. d4 d6 5. h3 Nh6 6. e6
Nimzowitsch Defense: El Columpio Defense, Exchange Variation: 1. e4 Nc6 2. Nf3 Nf6 3. e5 Ng4 4. d4 d6 5. h3 Nh6 6. exd6
Hippopotamus Defense: 1. e4 Nh6
Hippopotamus Defense: 1. e4 Nh6 2. d4 g6 3. c4 f6

B01 Scandinavian Defence (Center Counter Defence): 1...d5 (without 2.Nf3 (Tennison Gambit, A06))

Scandinavian Defense: 1. e4 d5
Scandinavian Defense: 1. e4 d5 2. b3
Scandinavian Defense: Zilbermints Gambit: 1. e4 d5 2. b4
Scandinavian Defense: Blackburne-Kloosterboer Gambit: 1. e4 d5 2. exd5 c6
Scandinavian Defense: Kloosterboer Gambit: 1. e4 d5 2. exd5 c6 3. dxc6 e5
Scandinavian Defense: Blackburne Gambit: 1. e4 d5 2. exd5 c6 3. dxc6 Nxc6
Scandinavian Defense: Boehnke Gambit: 1. e4 d5 2. exd5 e5 3. dxe6 Bxe6
Scandinavian Defense: Modern Variation: 1. e4 d5 2. exd5 Nf6
Scandinavian Defense: Panov Transfer: 1. e4 d5 2. exd5 Nf6 3. c4 c6
Scandinavian Defense: Icelandic-Palme Gambit: 1. e4 d5 2. exd5 Nf6 3. c4 e6
Scandinavian Defense: Modern Variation: 1. e4 d5 2. exd5 Nf6 3. d4
Scandinavian Defense: Portuguese Gambit: 1. e4 d5 2. exd5 Nf6 3. d4 Bg4
Scandinavian Defense: Portuguese Gambit, Elbow Variation: 1. e4 d5 2. exd5 Nf6 3. d4 Bg4 4. Bb5+ c6
Scandinavian Defense: Portuguese Gambit, Lusophobe Variation: 1. e4 d5 2. exd5 Nf6 3. d4 Bg4 4. Bb5+ Nbd7 5. Be2
Scandinavian Defense: Portuguese Gambit, Wuss Variation: 1. e4 d5 2. exd5 Nf6 3. d4 Bg4 4. Be2
Scandinavian Defense: Portuguese Gambit, Jadoul Variation: 1. e4 d5 2. exd5 Nf6 3. d4 Bg4 4. f3 Bf5 5. Bb5+ Nbd7 6. c4
Scandinavian Defense: Portuguese Gambit, Melbourne Shuffle Variation: 1. e4 d5 2. exd5 Nf6 3. d4 Bg4 4. f3 Bf5 5. Bb5+ Nbd7 6. Nc3
Scandinavian Defense: Portuguese Gambit, Banker Variation: 1. e4 d5 2. exd5 Nf6 3. d4 Bg4 4. f3 Bf5 5. c4
Scandinavian Defense: Portuguese Gambit, Correspondence Refutation: 1. e4 d5 2. exd5 Nf6 3. d4 Bg4 4. f3 Bf5 5. g4
Scandinavian Defense: Portuguese Gambit, Classical Variation: 1. e4 d5 2. exd5 Nf6 3. d4 Bg4 4. Nf3
Scandinavian Defense: Kádas Gambit: 1. e4 d5 2. exd5 Nf6 3. d4 c6 4. dxc6 e5
Scandinavian Defense: Richter Variation: 1. e4 d5 2. exd5 Nf6 3. d4 g6
Scandinavian Defense: Modern Variation, Wing Gambit: 1. e4 d5 2. exd5 Nf6 3. d4 g6 4. c4 b5
Scandinavian Defense: Marshall Variation: 1. e4 d5 2. exd5 Nf6 3. d4 Nxd5
Scandinavian Defense: Kiel Variation: 1. e4 d5 2. exd5 Nf6 3. d4 Nxd5 4. c4 Nb4
Scandinavian Defense: Modern Variation, Gipslis Variation: 1. e4 d5 2. exd5 Nf6 3. d4 Nxd5 4. Nf3 Bg4
Scandinavian Defense: Richter Variation: 1. e4 d5 2. exd5 Nf6 3. d4 Nxd5 4. Nf3 g6
Scandinavian Defense: Mieses-Kotroc Variation: 1. e4 d5 2. exd5 Qxd5
Scandinavian Defense: Main Line: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5
Scandinavian Defense: Main Line, Leonhardt Gambit: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. b4
Scandinavian Defense: Anderssen Counterattack: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 e5
Scandinavian Defense: Anderssen Counterattack, Orthodox Attack: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 e5 5. dxe5 Nc6 6. Nf3 Bb4 7. Bd2
Scandinavian Defense: Anderssen Counterattack, Goteborg System: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 e5 5. Nf3
Scandinavian Defense: Anderssen Counterattack, Collijn Variation: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 e5 5. Nf3 Bg4
Scandinavian Defense: Main Line, Mieses Variation: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 Nf6
Scandinavian Defense: Classical Variation: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 Nf6 5. Nf3 Bf5
Scandinavian Defense: Grünfeld Variation: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 Nf6 5. Nf3 Bf5 6. Ne5 c6 7. g4
Scandinavian Defense: Lasker Variation: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 Nf6 5. Nf3 Bg4 6. h3
Scandinavian Defense: Gubinsky-Melts Defense: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qd6
Scandinavian Defense: Schiller-Pytel Variation: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qd6 4. d4 c6
Scandinavian Defense: Schiller-Pytel Variation, Modern Variation: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qd6 4. d4 Nf6 5. Bc4 c6 6. Nge2 Bf5 7. Bf4 Qb4
Scandinavian Defense: Bronstein Variation: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qd6 4. d4 Nf6 5. Nf3 a6
Scandinavian Defense: Valencian Variation: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qd8
Scandinavian Defense: Valencian Variation, Main Line: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qd8 4. d4 Nf6 5. Nf3 Bg4
Scandinavian Defense: Valencian Variation, Ilundain Variation: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qd8 4. d4 Nf6 5. Nf3 c6
Van Geet Opening: Grünfeld Defense: 1. e4 d5 2. Nc3 dxe4 3. Nxe4 e5

B02 Alekhine's Defence: 1.e4 Nf6

Alekhine Defense: 1. e4 Nf6
Alekhine Defense: Krejcik Variation: 1. e4 Nf6 2. Bc4
Alekhine Defense: Krejcik Variation, Krejcik Gambit: 1. e4 Nf6 2. Bc4 Nxe4 3. Bxf7+
Alekhine Defense: Maróczy Variation: 1. e4 Nf6 2. d3
Alekhine Defense: Normal Variation: 1. e4 Nf6 2. e5 Nd5
Alekhine Defense: Welling Variation: 1. e4 Nf6 2. e5 Nd5 3. b3
Alekhine Defense: Kmoch Variation: 1. e4 Nf6 2. e5 Nd5 3. Bc4 Nb6 4. Bb3 c5 5. d3
Alekhine Defense: Two Pawns Attack: 1. e4 Nf6 2. e5 Nd5 3. c4
Alekhine Defense: Two Pawns Attack, Tate Variation: 1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. a4
Alekhine Defense: Steiner Variation: 1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. b3
Alekhine Defense: Two Pawns Attack, Lasker Variation: 1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. c5
Alekhine Defense: Hunt Variation, Lasker Simul Gambit: 1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. c5 Nd5 5. Bc4 e6 6. Nc3
Alekhine Defense: Two Pawns Attack, Mikenas Variation: 1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. c5 Nd5 5. Bc4 e6 6. Nc3 d6
Alekhine Defense: Hunt Variation, Mikenas Gambit: 1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. c5 Nd5 5. Bc4 e6 6. Nc3 d6 7. Nxd5 exd5 8. Bxd5
Alekhine Defense: Hunt Variation, Matsukevich Gambit: 1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. c5 Nd5 5. Nc3 Nxc3 6. dxc3 d6 7. Bg5
Alekhine Defense: The Squirrel: 1. e4 Nf6 2. e5 Nd5 3. c4 Nf4
Alekhine Defense: Buckley Attack: 1. e4 Nf6 2. e5 Nd5 3. Na3
Alekhine Defense: Sämisch Attack: 1. e4 Nf6 2. e5 Nd5 3. Nc3
Alekhine Defense: Mokele Mbembe: 1. e4 Nf6 2. e5 Ne4
Alekhine Defense: Mokele Mbembe, Vavra Defense: 1. e4 Nf6 2. e5 Ne4 3. d4 e6
Alekhine Defense: Mokele Mbembe, Modern Line: 1. e4 Nf6 2. e5 Ne4 3. d4 f6
Alekhine Defense: Brooklyn Variation: 1. e4 Nf6 2. e5 Ng8
Alekhine Defense: Brooklyn Variation, Everglades Variation: 1. e4 Nf6 2. e5 Ng8 3. d4 f5
Alekhine Defense: Scandinavian Variation: 1. e4 Nf6 2. Nc3 d5
Alekhine Defense: Scandinavian Variation, Myers Gambit: 1. e4 Nf6 2. Nc3 d5 3. d3 dxe4 4. Bg5
Alekhine Defense: Spielmann Gambit: 1. e4 Nf6 2. Nc3 d5 3. e5 Nfd7 4. e6
Alekhine Defense: Scandinavian Variation, Geschev Gambit: 1. e4 Nf6 2. Nc3 d5 3. exd5 c6

B03: 1.e4 Nf6 2.e5 Nd5 3.d4 (including the Exchange Variation and Four Pawns Attack)

Alekhine Defense: 1. e4 Nf6 2. e5 Nd5 3. d4
Alekhine Defense: O'Sullivan Gambit: 1. e4 Nf6 2. e5 Nd5 3. d4 b5
Alekhine Defense: 1. e4 Nf6 2. e5 Nd5 3. d4 d6
Alekhine Defense: Balogh Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Bc4
Alekhine Defense: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4
Alekhine Defense: Hunt Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. c5
Alekhine Defense: Exchange Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. exd6
Alekhine Defense: Exchange Variation, Voronezh Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. exd6 cxd6 6. Nc3 g6 7. Be3 Bg7 8. Rc1 O-O 9. b3
Alekhine Defense: Exchange Variation, Karpov Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. exd6 cxd6 6. Nc3 g6 7. h3 Bg7 8. Nf3 O-O 9. Be2 Nc6 10. O-O Bf5 11. Bf4
Alekhine Defense: Four Pawns Attack: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4
Alekhine Defense: Four Pawns Attack, Trifunovic Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 Bf5
Alekhine Defense: Four Pawns Attack, Korchnoi Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 dxe5 6. fxe5 Bf5 7. Nc3 e6 8. Nf3 Be7 9. Be2 O-O 10. O-O f6
Alekhine Defense: Four Pawns Attack, Main Line: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 dxe5 6. fxe5 Nc6 7. Be3
Alekhine Defense: Four Pawns Attack, Tartakower Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 dxe5 6. fxe5 Nc6 7. Be3 Bf5 8. Nc3 e6 9. Nf3 Qd7 10. Be2 O-O-O 11. O-O Be7
Alekhine Defense: Four Pawns Attack, Ilyin-Zhenevsky Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 dxe5 6. fxe5 Nc6 7. Nf3 Bg4 8. e6 fxe6 9. c5
Alekhine Defense: Four Pawns Attack, Cambridge Gambit: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 g5
Alekhine Defense: Four Pawns Attack, Fianchetto Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4 g6
Alekhine Defense: Modern Variation, Alekhine Gambit: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. Nf3 Bg4 6. Be2

B04: 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 (Modern Variation without 4...Bg4)

Alekhine Defense: Modern Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3
Alekhine Defense: Modern Variation, Larsen Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 dxe5
Alekhine Defense: Modern Variation, Alburt Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 g6
Alekhine Defense: Modern Variation, Keres Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 g6 5. Bc4 Nb6 6. Bb3 Bg7 7. a4
Alekhine Defense: Modern Variation, Schmid Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Nb6
Alekhine Defense: Modern Variation, Larsen-Haakert Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Nc6

B05: 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 Bg4 (Modern Variation with 4...Bg4)

Alekhine Defense: Modern Variation, Main Line: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4
Alekhine Defense: Modern Variation, Flohr Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4 5. Be2 c6
Alekhine Defense: Modern Variation, Alekhine Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4 5. c4
Alekhine Defense: Modern Variation, Vitolins Attack: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4 5. c4 Nb6 6. d5
Alekhine Defense: Modern Variation, Panov Variation: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4 5. h3

B06 Robatsch (Modern) Defence, including Monkey's Bum

Pterodactyl Defense: Eastern, Benoni: 1. d4 g6 2. e4 Bg7 3. Nc3 c5 4. d5
Pterodactyl Defense: Eastern, Benoni Pterodactyl: 1. d4 g6 2. Nc3 Bg7 3. e4 c5 4. d5 Qa5
Modern Defense: 1. e4 g6
Modern Defense: Bishop Attack, Monkey's Bum: 1. e4 g6 2. Bc4 Bg7 3. Qf3 e6 4. d4 Bxd4
Modern Defense: 1. e4 g6 2. d4 Bg7
Modern Defense: Bishop Attack: 1. e4 g6 2. d4 Bg7 3. Bc4
Modern Defense: Bishop Attack, Bücker Gambit: 1. e4 g6 2. d4 Bg7 3. Bc4 b5
Modern Defense: Westermann Gambit: 1. e4 g6 2. d4 Bg7 3. Bd2
Modern Defense: Wind Gambit: 1. e4 g6 2. d4 Bg7 3. Bd3
Pterodactyl Defense: Central, Benoni Quetzalcoatlus: 1. e4 g6 2. d4 Bg7 3. c4 c5 4. d5 d6 5. Nc3 Qa5
Pterodactyl Defense: Central, Anhanguera: 1. e4 g6 2. d4 Bg7 3. c4 c5 4. Nc3 d6 5. Be3 Qa5
Pterodactyl Defense: Central, Quetzalcoatlus Gambit: 1. e4 g6 2. d4 Bg7 3. c4 c5 4. Nc3 d6 5. dxc5 Qa5
Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation Declined: 1. e4 g6 2. d4 Bg7 3. c4 c5 4. Nf3 d6 5. Be2 Qa5+
Modern Defense: Dunworthy Variation: 1. e4 g6 2. d4 Bg7 3. c4 d5 4. exd5 c6 5. dxc6 Bxd4
Modern Defense: Three Pawns Attack: 1. e4 g6 2. d4 Bg7 3. f4
Pterodactyl Defense: Austrian, Pteranodon: 1. e4 g6 2. d4 Bg7 3. f4 c5 4. c3 Qa5
Pterodactyl Defense: Austrian, Austriadactylus Western: 1. e4 g6 2. d4 Bg7 3. f4 c5 4. Nf3 Qa5+
Pterodactyl Defense: Fianchetto, Rhamphorhynchus: 1. e4 g6 2. d4 Bg7 3. g3 c5 4. dxc5 Qa5+
Pterodactyl Defense: Fianchetto, King Pterodactyl: 1. e4 g6 2. d4 Bg7 3. g3 c5 4. Nf3 Qa5+
Modern Defense: Standard Line: 1. e4 g6 2. d4 Bg7 3. Nc3
Modern Defense: Mongredien Defense, with Nc3: 1. e4 g6 2. d4 Bg7 3. Nc3 b6
Modern Defense: Modern Pterodactyl: 1. e4 g6 2. d4 Bg7 3. Nc3 c5
Pterodactyl Defense: Eastern, Anhanguera: 1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. Be3
Pterodactyl Defense: Eastern, Benoni Pteranodon: 1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. d5 Bxc3+ 5. bxc3 Qa5
Pterodactyl Defense: Eastern, Rhamphorhynchus: 1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. dxc5
Pterodactyl Defense: Eastern, Pteranodon: 1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. dxc5 Bxc3+ 5. bxc3 Qa5
Pterodactyl Defense: Eastern, Pterodactyl: 1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. dxc5 Qa5
Pterodactyl Defense: Sicilian, Siroccopteryx: 1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. Nf3 Qa5 5. Bc4
Pterodactyl Defense: Sicilian, Quetzalcoatlus: 1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. Nf3 Qa5 5. Be2 d6
Modern Defense: Anti-Modern: 1. e4 g6 2. d4 Bg7 3. Nc3 c6 4. Bc4 d6 5. Qe2
Modern Defense: Gurgenidze Defense: 1. e4 g6 2. d4 Bg7 3. Nc3 c6 4. f4 d5 5. e5 h5
Modern Defense: Two Knights Variation, Suttles Variation: 1. e4 g6 2. d4 Bg7 3. Nc3 c6 4. Nf3 d6
Modern Defense: Lizard Defense, Mittenberger Gambit: 1. e4 g6 2. d4 Bg7 3. Nc3 d5
Modern Defense: Standard Defense: 1. e4 g6 2. d4 Bg7 3. Nc3 d6
Modern Defense: Pseudo-Austrian Attack: 1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. f4
Modern Defense: Two Knights Variation: 1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. Nf3
Modern Defense: Two Knights Variation, Suttles Variation, Tal Gambit: 1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. Nf3 c6 5. Bg5 Qb6 6. Qd2 Qxb2
Modern Defense: Mongredien Defense, with Nf3: 1. e4 g6 2. d4 Bg7 3. Nf3 b6
Pterodactyl Defense: Western, Anhanguera: 1. e4 g6 2. d4 Bg7 3. Nf3 c5 4. Be3 Qa5+
Rat Defense: Accelerated Gurgenidze: 1. e4 g6 2. d4 d6 3. Nc3 c6
Modern Defense: Fianchetto Gambit: 1. e4 g6 2. d4 f5
Modern Defense: Norwegian Defense: 1. e4 g6 2. d4 Nf6
Modern Defense: Norwegian Defense, Norwegian Gambit: 1. e4 g6 2. d4 Nf6 3. e5 Nh5 4. Be2 d6
Modern Defense: Masur Gambit: 1. e4 g6 2. d4 Nh6 3. Nc3 f5 4. Bxh6 Bxh6 5. exf5 O-O
Pterodactyl Defense: Austrian, Grand Prix Pterodactyl: 1. e4 g6 2. Nc3 Bg7 3. f4 c5 4. Nf3 Qa5
Pterodactyl Defense: Western, Siroccopteryx: 1. e4 g6 2. Nf3 Bg7 3. d4 c5 4. Bc4 cxd4 5. Nxd4 Qa5+

B07 Pirc Defence

King's Pawn Game: Maróczy Defense: 1. e4 d6 2. d4 e5
Czech Defense: 1. e4 d6 2. d4 Nf6 3. Nc3 c6
Pirc Defense: 1. e4 d6 2. d4 Nf6 3. Nc3 g6
Pirc Defense: Kholmov System: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Bc4
Pirc Defense: Chinese Variation: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be2 Bg7 5. g4
Pirc Defense: Bayonet Attack: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be2 Bg7 5. h4
Pirc Defense: 150 Attack, Sveshnikov-Janša Attack: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be3 c6 5. h3
Pirc Defense: 150 Attack: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be3 c6 5. Qd2
Pirc Defense: 150 Attack, Inner Doll Defense: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be3 c6 5. Qd2 Bg4
Pirc Defense: Byrne Variation: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Bg5
Pirc Defense: Sveshnikov System: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. g3
Lion Defense: Anti-Philidor: 1. e4 d6 2. d4 Nf6 3. Nc3 Nbd7 4. f4
Lion Defense: Anti-Philidor, Lion's Cave: 1. e4 d6 2. d4 Nf6 3. Nc3 Nbd7 4. f4 e5
Lion Defense: Anti-Philidor, Lion's Cave, Lion Claw Gambit: 1. e4 d6 2. d4 Nf6 3. Nc3 Nbd7 4. f4 e5 5. Nf3 exd4 6. Qxd4 c6 7. Bc4 d5
Lion Defense: Bayonet Attack: 1. e4 d6 2. d4 Nf6 3. Nc3 Nbd7 4. g4
Modern Defense: Geller's System: 1. e4 g6 2. d4 Bg7 3. Nf3 d6 4. c3

B08 Pirc, Classical (Two Knights) System

Pirc Defense: Classical Variation: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3
Pirc Defense: Classical Variation: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7
Pirc Defense: Classical Variation, Quiet System: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. Be2
Pirc Defense: Classical Variation, Quiet System, Parma Defense: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. Be2 O-O 6. O-O Bg4
Pirc Defense: Classical Variation, Quiet System, Czech Defense: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. Be2 O-O 6. O-O c6
Pirc Defense: Classical Variation, Quiet System, Chigorin Line: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. Be2 O-O 6. O-O Nc6
Pirc Defense: Classical Variation, Schlechter Variation: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. h3

B09 Pirc, Austrian Attack

Pirc Defense: Austrian Attack: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4
Pirc Defense: Austrian Attack, Ljubojevic Variation: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Bc4
Pirc Defense: Austrian Attack, Dragon Formation: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 c5
Pirc Defense: Austrian Attack: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 O-O
Pirc Defense: Austrian Attack, Weiss Variation: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 O-O 6. Bd3
Pirc Defense: Austrian Attack, Kurajica Variation: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 O-O 6. Be3
Pirc Defense: Austrian Attack, Unzicker Attack: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 O-O 6. e5
Pirc Defense: Austrian Attack, Unzicker Attack, Bronstein Variation: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 O-O 6. e5 Nfd7 7. h4

B10 Caro–Kann Defence

Caro-Kann Defense: 1. e4 c6
Caro-Kann Defense: Euwe Attack: 1. e4 c6 2. b3
Caro-Kann Defense: Labahn Attack: 1. e4 c6 2. b4
Caro-Kann Defense: Labahn Attack, Double Gambit: 1. e4 c6 2. b4 d5 3. b5
Caro-Kann Defense: Labahn Attack, Polish Variation: 1. e4 c6 2. b4 e5 3. Bb2
Caro-Kann Defense: Hillbilly Attack: 1. e4 c6 2. Bc4
Caro-Kann Defense: Hillbilly Attack, Schaeffer Gambit: 1. e4 c6 2. Bc4 d5 3. Bb3 dxe4 4. Qh5
Caro-Kann Defense: Accelerated Panov Attack: 1. e4 c6 2. c4
Caro-Kann Defense: Accelerated Panov Attack: 1. e4 c6 2. c4 d5
Caro-Kann Defense: Accelerated Panov Attack, Van Weersel Attack: 1. e4 c6 2. c4 d5 3. cxd5 cxd5 4. Qb3
Caro-Kann Defense: Toikkanen Gambit: 1. e4 c6 2. c4 d5 3. e5
Caro-Kann Defense: Accelerated Panov Attack, Modern Variation: 1. e4 c6 2. c4 d5 3. exd5 cxd5 4. cxd5 Nf6
Caro-Kann Defense: Accelerated Panov Attack, Pseudo-Scandinavian: 1. e4 c6 2. c4 d5 3. exd5 Qxd5
Caro-Kann Defense: Accelerated Panov Attack, Open Variation: 1. e4 c6 2. c4 e5
Caro-Kann Defense: Breyer Variation: 1. e4 c6 2. d3
Caro-Kann Defense: Breyer Variation, Stein Attack: 1. e4 c6 2. d3 d5 3. Nd2 g6 4. Ngf3 Bg7 5. g3 e5 6. Bg2 Ne7 7. O-O O-O 8. b4
Caro-Kann Defense: Spike Variation: 1. e4 c6 2. g4
Caro-Kann Defense: Spike Variation, Scorpion-Grob Gambit: 1. e4 c6 2. g4 d5 3. Nc3 dxe4 4. d3
Caro-Kann Defense: 1. e4 c6 2. Nc3
Caro-Kann Defense: 1. e4 c6 2. Nc3 d5
Caro-Kann Defense: Scorpion-Horus Gambit: 1. e4 c6 2. Nc3 d5 3. d3 dxe4 4. Bg5
Caro-Kann Defense: St. Patrick's Attack: 1. e4 c6 2. Nc3 d5 3. h3
Caro-Kann Defense: Two Knights Attack: 1. e4 c6 2. Nc3 d5 3. Nf3
Caro-Kann Defense: Hector Gambit: 1. e4 c6 2. Nc3 d5 3. Nf3 dxe4 4. Ng5
Caro-Kann Defense: Goldman Variation: 1. e4 c6 2. Nc3 d5 3. Qf3
Caro-Kann Defense: Endgame Offer: 1. e4 c6 2. Nf3 d5 3. d3
Caro-Kann Defense: Endgame Variation: 1. e4 c6 2. Nf3 d5 3. d3 dxe4 4. dxe4 Qxd1+ 5. Kxd1
Caro-Kann Defense: Apocalypse Attack: 1. e4 c6 2. Nf3 d5 3. exd5 cxd5 4. Ne5

B11 Caro–Kann, Two knights, 3...Bg4

Caro-Kann Defense: Two Knights Attack, Mindeno Variation: 1. e4 c6 2. Nc3 d5 3. Nf3 Bg4
Caro-Kann Defense: Two Knights Attack, Mindeno Variation, Retreat Line: 1. e4 c6 2. Nc3 d5 3. Nf3 Bg4 4. h3 Bh5
Caro-Kann Defense: Two Knights Attack, Mindeno Variation, Exchange Line: 1. e4 c6 2. Nc3 d5 3. Nf3 Bg4 4. h3 Bxf3

B12 Caro–Kann Defence

Caro-Kann Defense: 1. e4 c6 2. d4
Caro-Kann Defense: 1. e4 c6 2. d4 d5
Caro-Kann Defense: Mieses Attack, Landau Gambit: 1. e4 c6 2. d4 d5 3. Bd3 Nf6 4. e5 Nfd7 5. e6
Caro-Kann Defense: Mieses Gambit: 1. e4 c6 2. d4 d5 3. Be3
Caro-Kann Defense: Advance Variation: 1. e4 c6 2. d4 d5 3. e5
Caro-Kann Defense: Advance Variation, Prins Attack: 1. e4 c6 2. d4 d5 3. e5 Bf5 4. b4
Caro-Kann Defense: Advance, Short Variation: 1. e4 c6 2. d4 d5 3. e5 Bf5 4. c3 e6 5. Be2
Caro-Kann Defense: Advance Variation, Bayonet Attack: 1. e4 c6 2. d4 d5 3. e5 Bf5 4. g4
Caro-Kann Defense: Advance Variation, Tal Variation: 1. e4 c6 2. d4 d5 3. e5 Bf5 4. h4
Caro-Kann Defense: Advance Variation, Van der Wiel Attack: 1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nc3
Caro-Kann Defense: Advance Variation, Van der Wiel Attack: 1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nc3 e6 5. g4 Bg6 6. Nge2 c5 7. h4
Caro-Kann Defense: Advance Variation, Van der Wiel Attack, Dreyev Defense: 1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nc3 Qb6
Caro-Kann Defense: Advance Variation, Bronstein Variation: 1. e4 c6 2. d4 d5 3. e5 Bf5 4. Ne2
Caro-Kann Defense: Advance Variation, Short Variation: 1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nf3
Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense: 1. e4 c6 2. d4 d5 3. e5 c5
Caro-Kann Defense: Maróczy Variation: 1. e4 c6 2. d4 d5 3. f3
Caro-Kann Defense: Maróczy Variation, Maróczy Gambit: 1. e4 c6 2. d4 d5 3. f3 dxe4 4. fxe4 e5 5. Nf3 exd4 6. Bc4
Caro-Kann Defense: Modern Variation: 1. e4 c6 2. d4 d5 3. Nd2
Caro-Kann Defense: Edinburgh Variation: 1. e4 c6 2. d4 d5 3. Nd2 Qb6
Caro-Kann Defense: Ulysses Gambit: 1. e4 c6 2. d4 d5 3. Nf3 dxe4 4. Ng5
Caro-Kann Defense: Massachusetts Defense: 1. e4 c6 2. d4 f5
Caro-Kann Defense: De Bruycker Defense: 1. e4 c6 2. d4 Na6
Caro-Kann Defense: De Bruycker Defense: 1. e4 c6 2. d4 Na6 3. Nc3 Nc7
Caro-Kann Defense: Masi Variation: 1. e4 c6 2. d4 Nf6

B13 Caro–Kann, Exchange Variation

Caro-Kann Defense: Exchange Variation: 1. e4 c6 2. d4 d5 3. exd5
Caro-Kann Defense: Exchange Variation, Rubinstein Variation: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. Bd3 Nc6 5. c3 Nf6 6. Bf4
Caro-Kann Defense: Panov Attack: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4
Caro-Kann Defense: Panov Attack, Gunderam Attack: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. c5
Caro-Kann Defense: Panov Attack: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3
Caro-Kann Defense: Panov Attack, Modern Defense: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 Nc6
Caro-Kann Defense: Panov-Botvinnik, Herzog Defense: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 Nc6 6. Bg5 dxc4 7. d5 Na5
Caro-Kann Defense: Panov Attack, Modern Defense, Carlsbad Line: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 Nc6 6. Bg5 e6
Caro-Kann Defense: Panov Attack, Modern Defense, Czerniak Line: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 Nc6 6. Bg5 Qa5
Caro-Kann Defense: Panov Attack, Modern Defense, Reifir-Spielmann Line: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 Nc6 6. Bg5 Qb6
Caro-Kann Defense: Panov Attack, Modern Defense, Mieses Line: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 Nc6 6. Nf3 Bg4
Caro-Kann Defense: Exchange Variation, Bulla Attack: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. g4
Caro-Kann Defense: Exchange Variation: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. Nf3 Nc6

B14 Caro–Kann, Panov–Botvinnik Attack, 5...e6

Caro-Kann Defense: Panov Attack: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 e6
Caro-Kann Defense: Panov Attack, Main Line: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 e6 6. Nf3 Bb4
Caro-Kann Defense: Panov Attack, Fianchetto Defense: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 g6
Caro-Kann Defense: Panov Attack, Fianchetto Defense, Fianchetto Gambit: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 g6 6. cxd5 Bg7

B15 Caro–Kann Defence

Caro-Kann Defense: 1. e4 c6 2. d4 d5 3. Nc3
Caro-Kann Defense: Gurgenidze Counterattack: 1. e4 c6 2. d4 d5 3. Nc3 b5
Caro-Kann Defense: 1. e4 c6 2. d4 d5 3. Nc3 dxe4
Caro-Kann Defense: von Hennig Gambit: 1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Bc4
Caro-Kann Defense: Rasa-Studier Gambit: 1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. f3
Caro-Kann Defense: Alekhine Gambit: 1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Bd3
Caro-Kann Defense: Alien Gambit: 1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Ng5 h6 6. Nxf7
Caro-Kann Defense: Tartakower Variation: 1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Nxf6+ exf6
Caro-Kann Defense: Forgacs Variation: 1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Nxf6+ exf6 6. Bc4
Caro-Kann Defense: Gurgenidze System: 1. e4 c6 2. d4 d5 3. Nc3 g6
Caro-Kann Defense: Campomanes Attack: 1. e4 c6 2. d4 d5 3. Nc3 Nf6
Caro-Kann Defense: Main Line: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4

B16 Caro–Kann, Bronstein–Larsen Variation

Caro-Kann Defense: Bronstein-Larsen Variation: 1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Nxf6+ gxf6
Caro-Kann Defense: Finnish Variation: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 h6

B17 Caro–Kann, Steinitz Variation, Smyslov Systems

Caro-Kann Defense: Karpov Variation, Modern Variation, Kasparov Attack: 1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 5. Nf3 Ngf6 6. Ng3
Caro-Kann Defense: Karpov Variation: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Nd7
Caro-Kann Defense: Karpov Variation, Smyslov Variation: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Nd7 5. Bc4 Ngf6 6. Ng5 e6 7. Qe2 Nb6
Caro-Kann Defense: Karpov Variation, Smyslov Variation, Main Line: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Nd7 5. Bc4 Ngf6 6. Ng5 e6 7. Qe2 Nb6 8. Bb3
Caro-Kann Defense: Karpov Variation, Tiviakov-Fischer Attack: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Nd7 5. Bc4 Ngf6 6. Nxf6+ Nxf6
Caro-Kann Defense: Karpov Variation, Modern Variation: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Nd7 5. Ng5
Caro-Kann Defense: Karpov Variation, Modern Variation, Ivanchuk Defense: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Nd7 5. Ng5 Ndf6
Caro-Kann Defense: Karpov Variation, Modern Main Line: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Nd7 5. Ng5 Ngf6 6. Bd3 e6 7. N1f3 Bd6 8. Qe2 h6 9. Ne4 Nxe4 10. Qxe4

B18 Caro–Kann, Classical Variation

Caro-Kann Defense: Classical Variation: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Bf5
Caro-Kann Defense: Classical Variation, Maróczy Attack: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. f4
Caro-Kann Defense: Classical Variation, Main Line: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4
Caro-Kann Defense: Classical Variation, Flohr Variation: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. Nh3

B19 Caro–Kann, Classical, 7...Nd7

Caro-Kann Defense: Classical Variation: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7
Caro-Kann Defense: Classical Variation, Spassky Variation: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 8. h5
Caro-Kann Defense: Classical Variation, Lobron System: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 8. h5 Bh7 9. Bd3 Bxd3 10. Qxd3 e6 11. Bd2 Ngf6 12. O-O-O Be7
Caro-Kann Defense: Classical Variation, Seirawan Variation: 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 8. h5 Bh7 9. Bd3 Bxd3 10. Qxd3 Ngf6 11. Bd2 e6 12. O-O-O Bd6

B20–B99

1.e4 c5: Sicilian Defence

B20 Sicilian Defence, (any move for white without 2.Nc3 (B23–B26), 2.c3 (B22), 2.f4 (B21) and 2.Nf3 (B27–B99))
Sicilian Defense: 1. e4 c5
Sicilian Defense: Mengarini Variation: 1. e4 c5 2. a3
Sicilian Defense: Myers Attack, with a4: 1. e4 c5 2. a4
Sicilian Defense: Snyder Variation: 1. e4 c5 2. b3
Sicilian Defense: Snyder Variation, Queen Fianchetto Variation: 1. e4 c5 2. b3 b6
Sicilian Defense: Euwe Attack, Prins Gambit: 1. e4 c5 2. b3 d5 3. Bb2
Sicilian Defense: Wing Gambit: 1. e4 c5 2. b4
Sicilian Defense: Wing Gambit, Marshall Variation: 1. e4 c5 2. b4 cxb4 3. a3
Sicilian Defense: Wing Gambit, Carlsbad Variation: 1. e4 c5 2. b4 cxb4 3. a3 bxa3
Sicilian Defense: Wing Gambit, Marienbad Variation: 1. e4 c5 2. b4 cxb4 3. a3 d5 4. exd5 Qxd5 5. Bb2
Sicilian Defense: Wing Gambit, Romanian Defense: 1. e4 c5 2. b4 cxb4 3. a3 d5 4. exd5 Qxd5 5. Nf3 e5 6. Bb2 Nc6 7. c4 Qe6
Sicilian Defense: Wing Gambit, Nanu Gambit: 1. e4 c5 2. b4 cxb4 3. a3 d5 4. exd5 Qxd5 5. Nf3 e5 6. c4 Qe6 7. Bd3
Sicilian Defense: Wing Gambit, Abrahams Variation: 1. e4 c5 2. b4 cxb4 3. Bb2
Sicilian Defense: Wing Gambit, Santasiere Variation: 1. e4 c5 2. b4 cxb4 3. c4
Sicilian Defense: Bowdler Attack: 1. e4 c5 2. Bc4
Sicilian Defense: Staunton-Cochrane Variation: 1. e4 c5 2. c4
Sicilian Defense: Gloria Variation: 1. e4 c5 2. c4 d6 3. Nc3 Nc6 4. g3 h5
Sicilian Defense: Big Clamp Formation: 1. e4 c5 2. d3 Nc6 3. c3 d6 4. f4
Sicilian Defense: Lasker-Dunne Attack: 1. e4 c5 2. g3
Sicilian Defense: Grob Variation: 1. e4 c5 2. g4
Sicilian Defense: Myers Attack, with h4: 1. e4 c5 2. h4
Sicilian Defense: King David's Opening: 1. e4 c5 2. Ke2
Sicilian Defense: Kronberger Variation: 1. e4 c5 2. Na3
Sicilian Defense: Kronberger Variation, Nemeth Gambit: 1. e4 c5 2. Na3 Nc6 3. d4 cxd4 4. Bc4
Sicilian Defense: Keres Variation: 1. e4 c5 2. Ne2
Sicilian Defense: Brick Variation: 1. e4 c5 2. Nh3
Sicilian Defense: Amazon Attack: 1. e4 c5 2. Qg4

B21 Sicilian, Grand Prix Attack, 2.f4 (without 2...e5 (C30))
Sicilian Defense: Smith-Morra Gambit: 1. e4 c5 2. d4
Sicilian Defense: Smith-Morra Gambit: 1. e4 c5 2. d4 cxd4 3. c3
Sicilian Defense: Smith-Morra Gambit Declined, Push Variation: 1. e4 c5 2. d4 cxd4 3. c3 d3
Sicilian Defense: Smith-Morra Gambit Declined, Dubois Variation: 1. e4 c5 2. d4 cxd4 3. c3 d3 4. c4
Sicilian Defense: Smith-Morra Gambit Declined, Scandinavian Formation: 1. e4 c5 2. d4 cxd4 3. c3 d5
Sicilian Defense: Smith-Morra Gambit Accepted: 1. e4 c5 2. d4 cxd4 3. c3 dxc3
Sicilian Defense: Smith-Morra Gambit, Danish Variation: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nf3
Sicilian Defense: Smith-Morra Gambit Accepted, Chicago Defense: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 d6 5. Nf3 e6 6. Bc4 Nf6 7. O-O a6
Sicilian Defense: Smith-Morra Gambit Accepted, Taimanov Formation: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 e6 5. Bc4 a6 6. Nf3 Ne7
Sicilian Defense: Smith-Morra Gambit Accepted, Kan Formation: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 e6 5. Nf3 a6
Sicilian Defense: Smith-Morra Gambit Accepted, Finegold Defense: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 e6 5. Nf3 d6 6. Bc4 a6 7. O-O Be7 8. Qe2 Nf6
Sicilian Defense: Smith-Morra Gambit Accepted, Sozin Formation: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Bc4 e6 6. Nf3 d6 7. O-O a6 8. Qe2 b5
Sicilian Defense: Smith-Morra Gambit, Chicago Defense: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Bc4 e6 6. Nf3 d6 7. O-O a6 8. Qe2 b5 9. Bb3 Ra7
Sicilian Defense: Smith-Morra Gambit Accepted, Classical Formation: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 d6 6. Bc4 a6 7. O-O Nf6
Sicilian Defense: Smith-Morra Gambit Accepted, Scheveningen Formation: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 d6 6. Bc4 e6
Sicilian Defense: Smith-Morra Gambit Accepted, Paulsen Formation: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 a6
Sicilian Defense: Smith-Morra Gambit Accepted, Morphy Defense Deferred: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 a6 7. O-O b5 8. Bb3 Bc5
Sicilian Defense: Smith-Morra Gambit Accepted, Pin Defense: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 Bb4
Sicilian Defense: Smith-Morra Gambit Accepted, Morphy Defense: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 Bc5
Sicilian Defense: Smith-Morra Gambit Accepted, Siberian Variation: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 Qc7
Sicilian Defense: Smith-Morra Gambit Accepted, Larsen Defense: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 Qc7 7. Qe2 a6 8. O-O Bd6
Sicilian Defense: Smith-Morra Gambit Accepted, Siberian Variation, Siberian Trap: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 Qc7 7. Qe2 Nf6 8. O-O Ng4
Sicilian Defense: Smith-Morra Gambit Accepted, Fianchetto Defense: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 g6
Sicilian Defense: Smith-Morra Gambit Declined, Center Formation: 1. e4 c5 2. d4 cxd4 3. c3 e5
Sicilian Defense: Smith-Morra Gambit Declined, Alapin Formation: 1. e4 c5 2. d4 cxd4 3. c3 Nf6
Sicilian Defense: Smith-Morra Gambit Declined, Wing Formation: 1. e4 c5 2. d4 cxd4 3. c3 Qa5
Sicilian Defense: Halasz Gambit: 1. e4 c5 2. d4 cxd4 3. f4
Sicilian Defense: Morphy Gambit: 1. e4 c5 2. d4 cxd4 3. Nf3
Sicilian Defense: Morphy Gambit, Andreaschek Gambit: 1. e4 c5 2. d4 cxd4 3. Nf3 e5 4. c3
Sicilian Defense: Coles Sicilian Gambit: 1. e4 c5 2. d4 cxd4 3. Qxd4 Nc6 4. Qd1 Nf6 5. Bc4
Sicilian Defense: McDonnell Attack: 1. e4 c5 2. f4
Sicilian Defense: McDonnell Attack, Tal Gambit: 1. e4 c5 2. f4 d5 3. exd5 Nf6
Bird Opening: Dutch Variation, Batavo Gambit: 1. e4 c5 2. f4 d5 3. Nf3 dxe4

B22 Sicilian, Alapin Variation, 2.c3 (without 2...d6 3.Nf3 (C50), 2...e6 3.Nf3 d5 (B40), 2...e6 3.d4 d5 4.e5 (C02), 2...g6 3.Nf3 (B27))
Sicilian Defense: Alapin Variation: 1. e4 c5 2. c3
Sicilian Defense: Alapin Variation, Barmen Defense: 1. e4 c5 2. c3 d5 3. exd5 Qxd5
Sicilian Defense: Alapin Variation, Barmen Defense, Central Exchange: 1. e4 c5 2. c3 d5 3. exd5 Qxd5 4. d4 cxd4 5. cxd4 Nc6 6. Nf3 Bg4
Sicilian Defense: Alapin Variation, Barmen Defense, Endgame Variation: 1. e4 c5 2. c3 d5 3. exd5 Qxd5 4. d4 cxd4 5. cxd4 Nc6 6. Nf3 Bg4 7. Nc3 Bxf3 8. gxf3 Qxd4 9. Qxd4 Nxd4
Sicilian Defense: Alapin Variation, Barmen Defense, Milner-Barry Attack: 1. e4 c5 2. c3 d5 3. exd5 Qxd5 4. d4 Nc6 5. Nf3 cxd4 6. cxd4 e5 7. Nc3 Bb4 8. Be2
Sicilian Defense: Alapin Variation, Barmen Defense, Modern Line: 1. e4 c5 2. c3 d5 3. exd5 Qxd5 4. d4 Nf6 5. Nf3 Bg4
Sicilian Defense: Alapin Variation, Smith-Morra Declined: 1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. d4 cxd4
Sicilian Defense: Alapin Variation, Stoltz Attack: 1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. Nf3 Nc6 5. Bc4 Nb6 6. Bb3
Sicilian Defense: Alapin Variation, Stoltz Attack, Ivanchuk Line: 1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. Nf3 Nc6 5. Bc4 Nb6 6. Bb3 c4 7. Bc2 Qc7 8. Qe2 g5
Sicilian Defense: Heidenfeld Variation: 1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. Nf3 Nc6 5. Na3

B23 Sicilian, Closed, 2.Nc3 (without 2...a6 3.Nf3 (B28), 2...d6 3.Nf3 (B50), 2...Nc6 3.g3 (B24–B26))
Sicilian Defense: Closed: 1. e4 c5 2. Nc3
Sicilian Defense: Closed: 1. e4 c5 2. Nc3 e6
Sicilian Defense: Closed: 1. e4 c5 2. Nc3 e6 3. g3
Sicilian Defense: Closed, Korchnoi Defense: 1. e4 c5 2. Nc3 e6 3. g3 d5
Sicilian Defense: Closed, Traditional: 1. e4 c5 2. Nc3 Nc6
Sicilian Defense: Grand Prix Attack: 1. e4 c5 2. Nc3 Nc6 3. f4
Sicilian Defense: Grand Prix Attack, Schofman Variation: 1. e4 c5 2. Nc3 Nc6 3. f4 g6 4. Nf3 Bg7 5. Bc4 e6 6. f5
Sicilian Defense: Closed, Grob Attack: 1. e4 c5 2. Nc3 Nc6 3. g4
Sicilian Defense: Closed, Chameleon Variation: 1. e4 c5 2. Nc3 Nc6 3. Nge2

B24 Sicilian, Closed, 2.Nc3 Nc6 3.g3 (without 3...g6 (B25–B26))
Sicilian Defense: Closed, Fianchetto Variation: 1. e4 c5 2. Nc3 Nc6 3. g3
Sicilian Defense: Closed: 1. e4 c5 2. Nc3 Nc6 3. g3 g6
Sicilian Defense: Closed: 1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7
Sicilian Defense: Closed, Smyslov Variation: 1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 e6 6. Be3 Nd4 7. Nce2

B25 Sicilian, Closed, 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 (without 6.Be3 (B26))
Sicilian Defense: Closed: 1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6
Sicilian Defense: Closed: 1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. f4
Sicilian Defense: Closed, Botvinnik Defense, with f4: 1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. f4 e5
Sicilian Defense: Closed, Botvinnik Defense, Edge Variation: 1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. f4 e5 7. Nh3 Nge7
Sicilian Defense: Closed, Botvinnik Defense, with Nge2: 1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Nge2 e5

B26 Sicilian, Closed, 6.Be3
Sicilian Defense: Closed: 1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Be3

B27 Sicilian Defence, 2.Nf3 (without 2...a6 (B28), 2...Nc6 (B30), 2...d6 (B50), 2...e6 (B40), 2...Nf6 (B29))
Sicilian Defense: 1. e4 c5 2. Nf3
Sicilian Defense: Polish Gambit: 1. e4 c5 2. Nf3 b5
Sicilian Defense: Katalimov Variation: 1. e4 c5 2. Nf3 b6
Sicilian Defense: Jalalabad Variation: 1. e4 c5 2. Nf3 e5
Sicilian Defense: Brussels Gambit: 1. e4 c5 2. Nf3 f5
Sicilian Defense: Double-Dutch Gambit: 1. e4 c5 2. Nf3 f5 3. exf5 Nh6
Sicilian Defense: Hyperaccelerated Dragon: 1. e4 c5 2. Nf3 g6
Pterodactyl Defense: Western, Pterodactyl: 1. e4 c5 2. Nf3 g6 3. c3 Bg7 4. d4 Qa5
Sicilian Defense: Acton Extension: 1. e4 c5 2. Nf3 g6 3. c4 Bh6
Sicilian Defense: Hyperaccelerated Fianchetto: 1. e4 c5 2. Nf3 g6 3. d4
Sicilian Defense: Hyperaccelerated Pterodactyl: 1. e4 c5 2. Nf3 g6 3. d4 Bg7
Pterodactyl Defense: Western, Rhamphorhynchus: 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+
Pterodactyl Defense: Sicilian, Rhamphorhynchus: 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+ 5. Nc3
Pterodactyl Defense: Sicilian, Pteranodon: 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+ 5. Nc3 Bxc3+ 6. bxc3
Sicilian Defense: Hyperaccelerated Pterodactyl, Exchange Variation: 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+ 5. Nc3 Bxc3+ 6. bxc3 Qxc3+
Modern Defense: Pterodactyl Variation: 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5
Pterodactyl Defense: Sicilian, Unpin: 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Bd2
Pterodactyl Defense: Sicilian, Anhanguera: 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3
Pterodactyl Defense: Sicilian, Benoni Gambit: 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. d5
Sicilian Defense: Frederico Variation: 1. e4 c5 2. Nf3 g6 3. d4 f5
Sicilian Defense: Bücker Variation: 1. e4 c5 2. Nf3 h6
Sicilian Defense: Mongoose Variation: 1. e4 c5 2. Nf3 Qa5
Sicilian Defense: Quinteros Variation: 1. e4 c5 2. Nf3 Qc7

B28 Sicilian, O'Kelly Variation, 2.Nf3 a6 (without 3.d4 cxd4 4.Nxd4 e6 (B41, B43))
Sicilian Defense: O'Kelly Variation: 1. e4 c5 2. Nf3 a6
Sicilian Defense: O'Kelly Variation, Kieseritzky System: 1. e4 c5 2. Nf3 a6 3. b3
Sicilian Defense: O'Kelly Variation, Wing Gambit: 1. e4 c5 2. Nf3 a6 3. b4
Sicilian Defense: O'Kelly Variation, Aronin System: 1. e4 c5 2. Nf3 a6 3. Be2
Sicilian Defense: O'Kelly Variation, Venice System: 1. e4 c5 2. Nf3 a6 3. c3
Sicilian Defense: O'Kelly Variation, Venice System, Ljubojevic Line: 1. e4 c5 2. Nf3 a6 3. c3 b5
Sicilian Defense: O'Kelly Variation, Venice System, Gambit Line: 1. e4 c5 2. Nf3 a6 3. c3 d5 4. exd5 Nf6
Sicilian Defense: O'Kelly Variation, Venice System, Steiner Line: 1. e4 c5 2. Nf3 a6 3. c3 d6
Sicilian Defense: O'Kelly Variation, Venice System, Barcza Line: 1. e4 c5 2. Nf3 a6 3. c3 Nf6
Sicilian Defense: O'Kelly Variation, Maróczy Bind: 1. e4 c5 2. Nf3 a6 3. c4
Sicilian Defense: O'Kelly Variation, Maróczy Bind, Robatsch Line: 1. e4 c5 2. Nf3 a6 3. c4 d6
Sicilian Defense: O'Kelly Variation, Maróczy Bind, Paulsen Line: 1. e4 c5 2. Nf3 a6 3. c4 e6
Sicilian Defense: O'Kelly Variation, Quiet System: 1. e4 c5 2. Nf3 a6 3. d3
Sicilian Defense: O'Kelly Variation, Normal System: 1. e4 c5 2. Nf3 a6 3. d4
Sicilian Defense: O'Kelly Variation, Normal System, Cortlever Gambit: 1. e4 c5 2. Nf3 a6 3. d4 cxd4 4. Bc4
Sicilian Defense: O'Kelly Variation, Normal System, Smith-Morra Line: 1. e4 c5 2. Nf3 a6 3. d4 cxd4 4. c3
Sicilian Defense: O'Kelly Variation, Normal System, Taimanov Line: 1. e4 c5 2. Nf3 a6 3. d4 cxd4 4. Nxd4 e5
Sicilian Defense: O'Kelly Variation, Normal System, Zagorovsky Line: 1. e4 c5 2. Nf3 a6 3. d4 cxd4 4. Qxd4
Sicilian Defense: O'Kelly Variation, Réti System: 1. e4 c5 2. Nf3 a6 3. g3
Sicilian Defense: O'Kelly Variation, Yerevan System: 1. e4 c5 2. Nf3 a6 3. Nc3

B29 Sicilian, Nimzovich–Rubinstein Variation, 2.Nf3 Nf6 (without 3.e5 Nd5 4.c3 (B22), 3.Nc3 Nc6 (B30), 3.Nc3 d6 (B50), 3.d4 cxd4 4.Nxd4 d6 (B54, B56, B94–B99))
Sicilian Defense: Nimzowitsch Variation: 1. e4 c5 2. Nf3 Nf6
Sicilian Defense: Nimzowitsch Variation, Advance Variation: 1. e4 c5 2. Nf3 Nf6 3. e5
Sicilian Defense: Nimzowitsch Variation, Main Line: 1. e4 c5 2. Nf3 Nf6 3. e5 Nd5 4. Nc3 e6 5. Nxd5 exd5 6. d4 Nc6
Sicilian Defense: Nimzowitsch Variation, Exchange Variation: 1. e4 c5 2. Nf3 Nf6 3. e5 Nd5 4. Nc3 Nxc3
Sicilian Defense: Nimzowitsch Variation, Closed Variation: 1. e4 c5 2. Nf3 Nf6 3. Nc3

B30 Sicilian Defence, 2.Nf3 Nc6 (without 3.Bb5 g6 (B31) 3.Bb5 d6 (B51))
- Sicilian, Rossolimo Variation, 3.Bb5
Sicilian Defense: Old Sicilian: 1. e4 c5 2. Nf3 Nc6
Sicilian Defense: Portsmouth Gambit: 1. e4 c5 2. Nf3 Nc6 3. b4
Sicilian Defense: Nyezhmetdinov-Rossolimo Attack: 1. e4 c5 2. Nf3 Nc6 3. Bb5
Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, San Francisco Gambit: 1. e4 c5 2. Nf3 Nc6 3. Bb5 Na5 4. b4
Sicilian Defense: Rossolimo Variation, Brooklyn Retreat Defense: 1. e4 c5 2. Nf3 Nc6 3. Bb5 Nb8
Sicilian Defense: Closed, Anti-Sveshnikov Variation, with d6: 1. e4 c5 2. Nf3 Nc6 3. Nc3 e5 4. Bc4 Be7 5. d3 d6
Sicilian Defense: Closed, Anti-Sveshnikov Variation, Kharlov-Kramnik Line: 1. e4 c5 2. Nf3 Nc6 3. Nc3 e5 4. Bc4 Be7 5. d3 d6 6. Nd2 Bg5
Sicilian Defense: Closed, Anti-Sveshnikov Variation, with Nf6: 1. e4 c5 2. Nf3 Nc6 3. Nc3 e5 4. Bc4 Be7 5. d3 Nf6

B31 Sicilian, Nimzovich–Rossolimo Attack, 3.Bb5 g6
Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation: 1. e4 c5 2. Nf3 Nc6 3. Bb5 g6
Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation, Gufeld Gambit: 1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. O-O Bg7 5. c3 e5 6. d4
Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation, Lutikov Gambit: 1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. O-O Bg7 5. c3 Nf6 6. d4
Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation, Totsky Attack: 1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. O-O Bg7 5. c3 Nf6 6. Qa4
Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Gurgenidze Variation: 1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. O-O Bg7 5. Re1 e5 6. b4

B32 Sicilian Defence, 2.Nf3 Nc6 3.d4 (without 3...cxd4 4.Nxd4 Nf6 (B33), 4...e6 (B44–B47) 4...g6 (B34))
Sicilian Defense: Open: 1. e4 c5 2. Nf3 Nc6 3. d4
Sicilian Defense: Open: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4
Sicilian Defense: Open: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4
Sicilian Defense: O'Kelly Variation, Maróczy Bind, Geller Line: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 a6 5. c4 e5
Sicilian Defense: Nimzo-American Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 d5
Sicilian Defense: Löwenthal Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e5
Sicilian Defense: Kalashnikov Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e5 5. Nb5 d6
Sicilian Defense: Accelerated Dragon: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6
Sicilian Defense: Godiva Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Qb6
Sicilian Defense: Flohr Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Qc7
Sicilian Defense: Franco-Sicilian Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 e6

B33 Sicilian, Sveshnikov (Lasker–Pelikan) Variation, 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 (without 5.Nc3 e6 (B45) 5...g6 (B34) 5...d6 (B56))
Sicilian Defense: Open: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6
Sicilian Defense: Lasker-Pelikan Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5
Sicilian Defense: Lasker-Pelikan Variation, Schlechter Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Nb3
Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5
Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Novosibirsk Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Bxf6 gxf6 10. Nd5 Bg7
Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Bxf6 gxf6 10. Nd5 f5
Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Peresypkin's Sacrifice: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Bxf6 gxf6 10. Nd5 f5 11. Bxb5
Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Nd5
Sicilian Defense: Lasker-Pelikan Variation, Bird Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 Be6
Sicilian Defense: Lasker-Pelikan Variation, Retreat Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Nf3
Sicilian Defense: Lasker-Pelikan Variation, Exchange Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Nxc6
Sicilian Defense: Four Knights Variation, Cobra Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Ndb5 Bc5

B34 Sicilian, Accelerated Fianchetto, Exchange Variation, 2.Nf3 Nc6 3 d4.cxd4 4.Nxd4 g6 (without 5.c4 (B36), 5.Nc3 Bg7 6.Be3 Nf6 7.Bc4 (B35))
Sicilian Defense: Accelerated Dragon, Modern Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3
Sicilian Defense: Accelerated Dragon, Exchange Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nxc6

B35 Sicilian, Accelerated Fianchetto, Modern Variation with 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3 Bg7 6.Be3 Nf6 7.Bc4 (without 7...b6 (B72, B75))
Sicilian Defense: Accelerated Dragon, Modern Bc4 Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 Nf6 7. Bc4
Sicilian Defense: Dragon Variation, Modern Bc4 Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 Nf6 7. Bc4 d6

B36 Sicilian, Accelerated Fianchetto, Maroczy bind 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 (without 5...Bg7 (B37–B39))
Sicilian Defense: Accelerated Dragon, Maróczy Bind: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4
Sicilian Defense: Accelerated Dragon, Maróczy Bind, Gurgenidze Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Nf6 6. Nc3 Nxd4 7. Qxd4 d6

B37 Sicilian, Accelerated Fianchetto, Maroczy bind, 5...Bg7 (without 6.Be3 (B38))
Sicilian Defense: Accelerated Dragon, Maróczy Bind: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Bg7
Sicilian Defense: Accelerated Dragon, Simagin Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Bg7 6. Nc2 d6 7. Be2 Nh6

B38 Sicilian, Accelerated Fianchetto, Maroczy bind, 5...Bg7 6.Be3 (without 6...Nf6 7.Nc3 Ng4 (B39))
Sicilian Defense: Accelerated Dragon, Maróczy Bind: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Bg7 6. Be3

B39 Sicilian, Accelerated Fianchetto, Breyer Variation, 5...Bg7 6.Be3 Nf6 7.Nc3 Ng4
Sicilian Defense: Accelerated Dragon, Maróczy Bind, Breyer Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Bg7 6. Be3 Nf6 7. Nc3 Ng4

B40 Sicilian Defence, 2.Nf3 e6
Sicilian Defense: French Variation: 1. e4 c5 2. Nf3 e6
Sicilian Defense: French Variation, Westerinen Attack: 1. e4 c5 2. Nf3 e6 3. b3
Sicilian Defense: Wing Gambit Deferred: 1. e4 c5 2. Nf3 e6 3. b4
Sicilian Defense: Delayed Alapin Variation, with e6: 1. e4 c5 2. Nf3 e6 3. c3
Sicilian Defense: Alapin Variation, Sherzer Variation: 1. e4 c5 2. Nf3 e6 3. c3 Nf6 4. e5 Nd5 5. d4 Nc6
Sicilian Defense: Kramnik Variation: 1. e4 c5 2. Nf3 e6 3. c4
Sicilian Defense: Drazic Variation: 1. e4 c5 2. Nf3 e6 3. d4 a6
Sicilian Defense: French Variation, Open: 1. e4 c5 2. Nf3 e6 3. d4 cxd4
Sicilian Defense: Smith-Morra Gambit Deferred: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. c3
Sicilian Defense: Paulsen-Basman Defense: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Bc5
Sicilian Defense: French Variation, Normal: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6
Sicilian Defense: Pin Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Bb4
Sicilian Defense: Pin Variation, Jaffe Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Bb4 6. Bd3 e5
Sicilian Defense: Pin Variation, Koch Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Bb4 6. e5
Sicilian Defense: Four Knights Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6
Sicilian Defense: Four Knights Variation, Exchange Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Nxc6
Sicilian Defense: Gaw-Paw Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Qb6
Sicilian Defense: Kveinis Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Qb6
Sicilian Defense: Marshall Counterattack: 1. e4 c5 2. Nf3 e6 3. d4 d5
Sicilian Defense: Kan Variation, Wing Attack, Fianchetto Variation: 1. e4 c5 2. Nf3 e6 3. Nc3 a6 4. g3 b5 5. d4 cxd4 6. Nxd4

B41 Sicilian, Kan Variation, 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 (without 5.Bd3 (B42), 5.Nc3 (B43), 5.Be2 Nf6 6.Nc3 Qc7 (B43))
Sicilian Defense: Kan Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6
Sicilian Defense: Kan Variation, Maróczy Bind, Réti Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. c4
Sicilian Defense: Kan Variation, Maróczy Bind, Hedgehog Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. c4 g6
Sicilian Defense: Kan Variation, Maróczy Bind, Bronstein Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. c4 Nf6 6. Nc3 Bb4 7. Bd3 Nc6
Sicilian Defense: Kan Variation, Maróczy Bind, Bronstein Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. c4 Nf6 6. Nc3 Bb4 7. Bd3 Nc6 8. Bc2

B42 Sicilian, Kan, 5.Bd3
Sicilian Defense: Kan Variation, Modern Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3
Sicilian Defense: Kan Variation, Polugaevsky Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Bc5
Sicilian Defense: Kan Variation, Swiss Cheese Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 g6
Sicilian Defense: Kan Variation, Gipslis Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Nf6 6. O-O d6 7. c4 g6

B43 Sicilian, Kan, 5.Nc3
Sicilian Defense: Kan Variation, Knight Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3
Sicilian Defense: Kan Variation, Wing Attack: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 b5
Sicilian Defense: Kan Variation, Wing Attack, Christiansen's Dream: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 b5 6. Bd3 Qb6 7. Be3 Bc5 8. Qg4
Sicilian Defense: Kan Variation, Wing Attack, Spraggett Attack: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 b5 6. Bd3 Qb6 7. Nf3

B44 Sicilian Defence, 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6
Sicilian Defense: Taimanov Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6
Sicilian Defense: Taimanov Variation, Szén Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nb5
Sicilian Defense: Taimanov Variation, Modern Line: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nb5 d6 6. c4 Nf6 7. N1c3 a6 8. Na3 Be7 9. Be2 O-O 10. O-O b6
Sicilian Defense: Taimanov Variation, Gary Gambit: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nb5 d6 6. c4 Nf6 7. N1c3 a6 8. Na3 d5

B45 Sicilian, Taimanov Variation, 5.Nc3
Sicilian Defense: Taimanov Variation, Normal Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3
Sicilian Defense: Taimanov Variation, American Attack: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Nf6 6. Ndb5 Bb4 7. Nd6+

B46 Sicilian, Taimanov Variation
Sicilian Defense: Taimanov Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 a6

B47 Sicilian, Taimanov (Bastrikov) Variation
Sicilian Defense: Taimanov Variation, Bastrikov Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7
Sicilian Defense: Taimanov Variation, Bastrikov Variation, Ponomariov Gambit: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. Ndb5 Qb8 7. Be3 a6 8. Bb6

B48 Sicilian, Taimanov Variation
Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. Be3

B49 Sicilian, Taimanov Variation
Sicilian Defense: Taimanov Variation, Bastrikov Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. Be3 a6 7. Be2

B50 Sicilian Defence
Sicilian Defense: Modern Variations: 1. e4 c5 2. Nf3 d6
Sicilian Defense: Wing Gambit, Deferred Variation: 1. e4 c5 2. Nf3 d6 3. b4
Sicilian Defense: Kopec System: 1. e4 c5 2. Nf3 d6 3. Bd3
Sicilian Defense: Delayed Alapin Variation, with d6: 1. e4 c5 2. Nf3 d6 3. c3
Sicilian Defense: Delayed Alapin Variation, Basman-Palatnik Gambit: 1. e4 c5 2. Nf3 d6 3. c3 Nf6 4. Be2 Nc6 5. d4 cxd4 6. cxd4 Nxe4
Sicilian Defense: Delayed Alapin Variation, Basman-Palatnik Double Gambit: 1. e4 c5 2. Nf3 d6 3. c3 Nf6 4. Be2 Nc6 5. d4 cxd4 6. cxd4 Nxe4 7. d5 Qa5+ 8. Nc3 Nxc3 9. bxc3
Sicilian Defense: 1. e4 c5 2. Nf3 d6 3. d4
Sicilian Defense: 1. e4 c5 2. Nf3 d6 3. d4 cxd4
Sicilian Defense: Modern Variations, Tartakower: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. c3
Sicilian Defense: Modern Variations, Anti-Qxd4 Move Order: 1. e4 c5 2. Nf3 d6 3. d4 Nf6
Sicilian Defense: Modern Variations, Anti-Qxd4 Move Order Accepted: 1. e4 c5 2. Nf3 d6 3. d4 Nf6 4. dxc5 Nxe4
Sicilian Defense: Kotov Gambit: 1. e4 c5 2. Nf3 d6 3. g3 b5

B51 Sicilian, Canal–Sokolsky Attack
Sicilian Defense: Moscow Variation: 1. e4 c5 2. Nf3 d6 3. Bb5+
Sicilian Defense: Moscow Variation, Moscow Gambit: 1. e4 c5 2. Nf3 d6 3. Bb5+ Nc6 4. O-O Bd7 5. c3 Nf6 6. Re1 a6 7. Bxc6 Bxc6 8. d4 Bxe4 9. Bg5
Sicilian Defense: Moscow Variation, Dorfman Gambit: 1. e4 c5 2. Nf3 d6 3. Bb5+ Nc6 4. O-O Bd7 5. Qe2 g6 6. e5

B52 Sicilian, Canal–Sokolsky Attack, 3...Bd7
Sicilian Defense: Moscow Variation, Main Line: 1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7
Sicilian Defense: Moscow Variation, Sokolsky Variation: 1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Qxd7 5. c4
Sicilian Defense: Moscow Variation, Haag Gambit: 1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Qxd7 5. O-O Nc6 6. c3 Nf6 7. d4

B53 Sicilian, Chekhover Variation
Sicilian Defense: Chekhover Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Qxd4
Sicilian Defense: Chekhover Variation, Zaitsev Defense: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Qxd4 Nc6 5. Bb5 Qd7

B54 Sicilian
Sicilian Defense: Dragon Variation, Accelerated Dragon: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 g6
Sicilian Defense: Modern Variations, Main Line: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6
Sicilian Defense: Modern Variations, Ginsberg Gambit: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Bc4
Sicilian Defense: Prins Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. f3

B55 Sicilian, Prins Variation, Venice Attack
Sicilian Defense: Prins Variation, Venice Attack: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. f3 e5 6. Bb5+

B56 Sicilian
Sicilian Defense: Kupreichik Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Bd7
Sicilian Defense: Venice Attack: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Bb5+
Sicilian Defense: Classical Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6
Sicilian Defense: Classical Variation, Fianchetto Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. g3
Sicilian Defense: Yates Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bd3
Sicilian Defense: Spielmann Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Nde2

B57 Sicilian, Sozin (not Scheveningen) including Magnus Smith Trap
Sicilian Defense: Classical Variation, Sozin Attack: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bc4
Sicilian Defense: Magnus Smith Trap: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bc4 g6 7. Nxc6 bxc6 8. e5
Sicilian Defense: Classical Variation, Anti-Sozin Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bc4 Qb6

B58 Sicilian, Classical
Sicilian Defense: Classical Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Be2
Sicilian Defense: Boleslavsky Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Be2 e5
Sicilian Defense: Classical Variation, Dragon Transfer: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Be2 Nxd4 7. Qxd4 g6
Sicilian Defense: Boleslavsky Variation, Louma Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 e5 7. Nxc6

B59 Sicilian, Boleslavsky Variation, 7.Nb3
Sicilian Defense: Boleslavsky Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 e5 7. Nb3

B60 Sicilian, Richter–Rauzer
Sicilian Defense: Richter-Rauzer Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5
Sicilian Defense: Richter-Rauzer Variation, Modern Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 Bd7
Sicilian Defense: Richter-Rauzer Variation, Dragon Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 g6

B61 Sicilian, Richter–Rauzer, Larsen Variation, 7.Qd2
Sicilian Defense: Richter-Rauzer Variation, Modern Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 Bd7 7. Qd2

B62 Sicilian, Richter–Rauzer, 6...e6
Sicilian Defense: Richter-Rauzer Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6
Sicilian Defense: Richter-Rauzer Variation, Vitolins Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Bb5
Sicilian Defense: Richter-Rauzer Variation, Exchange Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Nxc6
Sicilian Defense: Richter-Rauzer Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd3
Sicilian Defense: Richter-Rauzer Variation, Podebrady Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Nb3

B63 Sicilian, Richter–Rauzer, Rauzer Attack
Sicilian Defense: Richter-Rauzer Variation, Traditional Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2
Sicilian Defense: Richter-Rauzer Variation, Classical Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7
Sicilian Defense: Richter-Rauzer Variation, Classical Variation, Kantscher Line: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 8. O-O-O Nxd4 9. Qxd4 a6 10. f4 b5
Sicilian Defense: Richter-Rauzer Variation, Ivanov Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Qb6

B64 Sicilian, Richter–Rauzer, Rauzer Attack, 7...Be7 defence, 9.f4
Sicilian Defense: Richter-Rauzer Variation, Classical Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 8. O-O-O O-O 9. f4
Sicilian Defense: Richter-Rauzer Variation, Classical Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 Be7 8. O-O-O O-O 9. f4 e5

B65 Sicilian, Richter–Rauzer, Rauzer Attack, 7...Be7 defence, 9...Nxd4
Sicilian Defense: Richter-Rauzer Variation, Rauzer Attack: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 8. O-O-O O-O 9. f4 Nxd4
Sicilian Defense: Richter-Rauzer Variation, Classical Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 8. O-O-O O-O 9. f4 Nxd4 10. Qxd4

B66 Sicilian, Richter–Rauzer, Rauzer Attack, 7...a6
Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation, Early Deviations: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 a6

B67 Sicilian, Richter–Rauzer, Rauzer Attack, 7...a6 defence, 8...Bd7
Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 a6 8. O-O-O Bd7

B68 Sicilian, Richter–Rauzer, Rauzer Attack, 7...a6 defence, 9...Be7
Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 a6 8. O-O-O Bd7 9. f4 Be7

B69 Sicilian, Richter–Rauzer, Rauzer Attack, 7...a6 defence, 11.Bxf6
Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation, Nyezhmetdinov Attack: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 a6 8. O-O-O Bd7 9. f4 Be7 10. Nf3 b5 11. Bxf6

B70 Sicilian, Dragon Variation
Sicilian Defense: Dragon Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6
Sicilian Defense: Dragon Variation, Classical Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be2
Sicilian Defense: Dragon Variation, Fianchetto Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. g3

B71 Sicilian, Dragon, Levenfish Attack
Sicilian Defense: Dragon Variation, Levenfish Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. f4
Sicilian Defense: Dragon Variation, Levenfish Variation, Main Line: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. f4 Nbd7

B72 Sicilian, Dragon, 6.Be3
Sicilian Defense: Dragon Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3
Sicilian Defense: Dragon Variation, Classical Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2
Sicilian Defense: Dragon Variation, Classical Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2 Nc6
Sicilian Defense: Dragon Variation, Classical Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Be2 Nc6 8. Nb3
Sicilian Defense: Dragon Variation, Classical Variation, Amsterdam Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 g6 7. Be3 Bg7 8. Qd2
Sicilian Defense: Dragon Variation, Classical Variation, Grigoriev Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 g6 7. Be3 Bg7 8. Qd2 O-O 9. O-O-O

B73 Sicilian, Dragon, Classical, 8.0-0
Sicilian Defense: Dragon Variation, Classical Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be2 Bg7 7. O-O Nc6 8. Be3
Sicilian Defense: Dragon Variation, Classical Variation, Battery Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be2 Bg7 7. O-O O-O 8. Be3 Nc6 9. Qd2
Sicilian Defense: Dragon Variation, Classical Variation, Zollner Gambit: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Be3 Bg7 6. Be2 Nf6 7. Nc3 O-O 8. O-O d6 9. f4 Qb6 10. e5

B74 Sicilian, Dragon, Classical, 9.Nb3
Sicilian Defense: Dragon Variation, Classical Variation, Stockholm Attack: 1. e4 c5 2. Nc3 d6 3. f4 Nc6 4. Nf3 g6 5. d4 cxd4 6. Nxd4 Bg7 7. Be3 Nf6 8. Be2 O-O 9. Nb3 Be6 10. O-O Na5 11. f5 Bc4 12. Nxa5 Bxe2 13. Qxe2 Qxa5 14. g4
Sicilian Defense: Dragon Variation, Classical Variation, Normal Line: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be2 Bg7 7. O-O O-O 8. Be3 Nc6 9. Nb3
Sicilian Defense: Dragon Variation, Classical Variation, Maróczy Line: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be2 Bg7 7. O-O O-O 8. Be3 Nc6 9. Nb3 Be6 10. f4 Na5
Sicilian Defense: Dragon Variation, Classical Variation, Tartakower Line: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be2 Bg7 7. O-O O-O 8. Be3 Nc6 9. Nb3 Be6 10. f4 Qc8
Sicilian Defense: Dragon Variation, Classical Variation, Bernard Defense: 1. e4 c5 2. Nf3 g6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 Bg7 7. O-O O-O 8. Be3 Nc6 9. Nb3 Be6 10. f4 Na5 11. f5 Bc4 12. Bd3 Bxd3 13. cxd3 d5
Sicilian Defense: Dragon Variation, Classical Variation, Spielmann Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 Nf6 7. Be2 O-O 8. Nb3 d6 9. O-O Be6 10. f4 Na5 11. f5 Bc4 12. Bd3
Sicilian Defense: Dragon Variation, Classical Variation, Alekhine Line: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 Nf6 7. Be2 O-O 8. O-O d6 9. Nb3 a5

B75 Sicilian, Dragon, Yugoslav Attack
Sicilian Defense: Dragon Variation, Yugoslav Attack, Early Deviations: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3
Sicilian Defense: Dragon Variation, Yugoslav Attack, Belezky Line: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 Nc6

B76 Sicilian, Dragon, Yugoslav Attack, 7...0-0
Sicilian Defense: Dragon Variation, Yugoslav Attack, Modern Line: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 Nc6 8. Qd2 O-O 9. O-O-O
Sicilian Defense: Dragon Variation, Yugoslav Attack: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O
Sicilian Defense: Dragon Variation, Yugoslav Attack: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. Qd2 Nc6
Sicilian Defense: Dragon Variation, Yugoslav Attack, Panov Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. Qd2 Nc6 9. g4

B77 Sicilian, Dragon, Yugoslav Attack, 9.Bc4
Sicilian Defense: Dragon Variation, Yugoslav Attack, Sosonko Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 Nc6 8. Qd2 O-O 9. Bc4 Nd7
Sicilian Defense: Dragon Variation, Yugoslav Attack, Czerniak Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 Nc6 8. Qd2 O-O 9. Bc4 Nxd4 10. Bxd4 Be6
Sicilian Defense: Dragon Variation, Yugoslav Attack, Main Line: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. Qd2 Nc6 9. Bc4
Sicilian Defense: Dragon Variation, Yugoslav Attack, Byrne Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. Qd2 Nc6 9. Bc4 a5
Sicilian Defense: Dragon Variation, Yugoslav Attack: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. Qd2 Nc6 9. Bc4 Bd7

B78 Sicilian, Dragon, Yugoslav Attack, 10.0-0-0
Sicilian Defense: Dragon Variation, Yugoslav Attack: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. Qd2 Nc6 9. Bc4 Bd7 10. O-O-O
Sicilian Defense: Dragon Variation, Yugoslav Attack, Old Line: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. Qd2 Nc6 9. Bc4 Bd7 10. O-O-O Rc8

B79 Sicilian, Dragon, Yugoslav Attack, 12.h4
Sicilian Defense: Dragon Variation, Yugoslav Attack: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. Qd2 Nc6 9. Bc4 Bd7 10. h4 Qa5 11. O-O-O Rfc8 12. Bb3
Sicilian Defense: Dragon Variation, Yugoslav Attack, Soltis Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. Qd2 Nc6 9. Bc4 Bd7 10. O-O-O Qa5 11. h4 Rfc8 12. Bb3 h5

B80 Sicilian, Scheveningen Variation
Sicilian Defense: Scheveningen Variation, English Attack, with Qd2: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e6 7. Qd2
Sicilian Defense: Scheveningen Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6
Sicilian Defense: Scheveningen Variation, Vitolins Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bb5+
Sicilian Defense: Scheveningen Variation, Fianchetto Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. g3

B81 Sicilian, Scheveningen, Keres Attack
Sicilian Defense: Scheveningen Variation, Keres Attack: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. g4

B82 Sicilian, Scheveningen, 6.f4
Sicilian Defense: Scheveningen Variation, Matanovic Attack: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. f4
Sicilian Defense: Scheveningen Variation, Tal Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. f4 Nc6 7. Be3 Be7 8. Qf3

B83 Sicilian, Scheveningen, 6.Be2
Sicilian Defense: Scheveningen Variation, Modern Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 d6 6. Be2 Nf6
Sicilian Defense: Scheveningen Variation, Classical Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2
Sicilian Defense: Scheveningen Variation, Modern Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 Be7 7. O-O O-O 8. f4 Nc6 9. Be3
Sicilian Defense: Scheveningen Variation, Modern Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 Be7 7. O-O O-O 8. f4 Nc6 9. Be3 Bd7 10. Nb3

B84 Sicilian, Scheveningen (Paulsen), Classical Variation
Sicilian Defense: Scheveningen Variation, Classical Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e6
Sicilian Defense: Najdorf Variation, Scheveningen Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e6 7. O-O Nbd7
Sicilian Defense: Scheveningen Variation, Classical Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e6 7. O-O Qc7

B85 Sicilian, Scheveningen, Classical Variation with ...Qc7 and ...Nc6
Sicilian Defense: Scheveningen Variation, Classical Variation, Paulsen Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f4 e6 7. Be2 Qc7 8. O-O Nc6
Sicilian Defense: Scheveningen Variation, Classical Main Line: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. Be2 a6 7. O-O Nf6 8. Be3 Be7 9. f4 d6 10. Qe1 O-O
Sicilian Defense: Scheveningen Variation, Classical Variation, Paulsen Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. Be2 a6 7. O-O Nf6 8. Be3 d6 9. f4
Sicilian Defense: Scheveningen Variation, Classical Variation, Paulsen Variation: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. Be2 a6 7. O-O Nf6 8. Kh1 Be7 9. f4 d6 10. a4

B86 Sicilian, Sozin Attack
Sicilian Defense: Sozin Attack: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bc4

B87 Sicilian, Sozin with ...a6 and ...b5
Sicilian Defense: Sozin Attack, Flank Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bc4 e6 7. Bb3 b5

B88 Sicilian, Sozin, Leonhardt Variation
Sicilian Defense: Sozin Attack, Leonhardt Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bc4 e6
Sicilian Defense: Sozin Attack, Fischer Variation: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bc4 e6 7. Bb3 Be7 8. Be3 O-O 9. f4

B89 Sicilian, Sozin, 7.Be3
Sicilian Defense: Sozin Attack, Main Line, Sherbakov Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bc4 e6 7. Be3 Be7 8. Bb3 O-O 9. O-O Na5 10. f4 b6
Sicilian Defense: Sozin Attack, Main Line: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bc4 e6 7. Be3
Sicilian Defense: Velimirovic Attack: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bc4 e6 7. Be3 Be7 8. Qe2

B90 Sicilian, Najdorf
Sicilian Defense: Najdorf Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6
Sicilian Defense: Najdorf Variation, Lipnitsky Attack: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bc4
Sicilian Defense: Najdorf Variation, English Attack: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3
Sicilian Defense: Scheveningen Variation, English Attack, with f3: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e6 7. f3
Sicilian Defense: Scheveningen Variation, Delayed Keres Attack: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e6 7. g4
Sicilian Defense: Scheveningen Variation, Delayed Keres Attack, Perenyi Gambit: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e6 7. g4 e5 8. Nf5 g6 9. g5
Sicilian Defense: Najdorf Variation, English Attack, Anti-English: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 Ng4
Sicilian Defense: Najdorf Variation, Dekker Gambit: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. g4
Sicilian Defense: Najdorf Variation, Adams Attack: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. h3
Sicilian Defense: Najdorf Variation, Freak Attack: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Rg1

B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation (6.g3)
Sicilian Defense: Najdorf Variation, Zagreb Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. g3

B92 Sicilian, Najdorf, Opocensky Variation (6.Be2)
Sicilian Defense: Najdorf Variation, Opocensky Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2
Sicilian Defense: Najdorf Variation, Opocensky Variation, Modern Line: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nb3 Be7 8. O-O Be6
Sicilian Defense: Najdorf Variation, Opocensky Variation, Traditional Line: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nb3 Be7 8. O-O O-O
Sicilian Defense: Najdorf Variation, Opocensky Variation: 1. e4 c5 2. Nf3 Nf6 3. Nc3 d6 4. d4 cxd4 5. Nxd4 a6 6. Be2 e5 7. Nb3 Be6 8. Be3

B93 Sicilian, Najdorf, 6.f4
Sicilian Defense: Najdorf Variation, Amsterdam Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f4

B94 Sicilian, Najdorf, 6.Bg5
Sicilian Defense: Najdorf Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5
Sicilian Defense: Najdorf Variation, Ivkov Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 Nbd7 7. Bc4 Qa5 8. Qd2 e6 9. O-O-O b5 10. Bb3 Bb7 11. Rhe1 Nc5 12. e5

B95 Sicilian, Najdorf, 6...e6
Sicilian Defense: Najdorf Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6

B96 Sicilian, Najdorf, 7.f4
Sicilian Defense: Najdorf Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4
Sicilian Defense: Najdorf Variation, Polugaevsky Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 b5
Sicilian Defense: Najdorf Variation, Polugaevsky Variation, Simagin Line: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 b5 8. e5 dxe5 9. fxe5 Qc7 10. Qe2
Sicilian Defense: Najdorf Variation, Neo-Classical Defense: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Nc6

B97 Sicilian, Najdorf, 7...Qb6 including Poisoned Pawn Variation
Sicilian Defense: Najdorf Variation, Poisoned Pawn Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Qb6
Sicilian Defense: Najdorf Variation, Poisoned Pawn Accepted: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Qb6 8. Qd2 Qxb2 9. Rb1 Qa3

B98 Sicilian, Najdorf, 7...Be7
Sicilian Defense: Najdorf Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7
Sicilian Defense: Najdorf Variation, Goteborg Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 8. Qf3 h6 9. Bh4 g5
Sicilian Defense: Najdorf Variation, Browne Variation: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 8. Qf3 h6 9. Bh4 Qc7
Sicilian Defense: Najdorf Variation, Traditional Line: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 8. Qf3 Qc7

B99 Sicilian, Najdorf, 7...Be7 Main line
Sicilian Defense: Najdorf Variation, Main Line: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 8. Qf3 Qc7 9. O-O-O Nbd7

C – Open Games and the French Defence

1.e4 e6: French Defence (C00–C19)
1.e4 e5: Open Game (C20–C99)

C00–C19

1.e4 e6: French Defence

C00 French Defence
French Defense: 1. e4 e6
French Defense: Horwitz Attack: 1. e4 e6 2. b3
French Defense: Horwitz Attack, Papa-Ticulat Gambit: 1. e4 e6 2. b3 d5 3. Bb2
French Defense: Banzai-Leong Gambit: 1. e4 e6 2. b4
French Defense: Banzai-Leong Gambit, Pinova Gambit: 1. e4 e6 2. b4 Bxb4 3. e5
French Defense: Bird Invitation: 1. e4 e6 2. Bb5
French Defense: Steiner Variation: 1. e4 e6 2. c4
French Defense: Orthoschnapp Gambit: 1. e4 e6 2. c4 d5 3. cxd5 exd5 4. Qb3
French Defense: King's Indian Attack: 1. e4 e6 2. d3
French Defense: Reversed Philidor Formation: 1. e4 e6 2. d3 d5 3. Nd2 Nf6 4. Ngf3 Nc6 5. Be2
French Defense: King's Indian Attack, Franco-Hiva Gambit: 1. e4 e6 2. d3 f5
French Defense: Normal Variation: 1. e4 e6 2. d4
French Defense: St. George Defense: 1. e4 e6 2. d4 a6
French Defense: St. George Defense, Three Pawn Attack: 1. e4 e6 2. d4 a6 3. c4
French Defense: St. George Defense, Sanky-George Gambit: 1. e4 e6 2. d4 a6 3. c4 b5
French Defense: St. George Defense, St. George Gambit: 1. e4 e6 2. d4 a6 3. c4 b5 4. cxb5 axb5
French Defense: St. George Defense, Traditional Line: 1. e4 e6 2. d4 a6 3. Nf3 b5 4. Bd3 c5 5. c3 Bb7 6. O-O Nf6
French Defense: Baeuerle Gambit: 1. e4 e6 2. d4 b5
French Defense: Franco-Sicilian Defense: 1. e4 e6 2. d4 c5
French Defense: 1. e4 e6 2. d4 d5
French Defense: Schlechter Variation: 1. e4 e6 2. d4 d5 3. Bd3
French Defense: Alapin Gambit: 1. e4 e6 2. d4 d5 3. Be3
French Defense: Diemer-Duhm Gambit: 1. e4 e6 2. d4 d5 3. c4
French Defense: Diemer-Duhm Gambit Accepted: 1. e4 e6 2. d4 d5 3. c4 dxe4
French Defense: Perseus Gambit: 1. e4 e6 2. d4 d5 3. Nf3
French Defense: Carlson Gambit: 1. e4 e6 2. d4 d5 3. Nf3 dxe4 4. Ne5
French Defense: Morphy Gambit: 1. e4 e6 2. d4 d5 3. Nh3
French Defense: Hoffmann Gambit: 1. e4 e6 2. d4 d5 3. Qe2 e5 4. f4 exf4
French Defense: Franco-Hiva Gambit: 1. e4 e6 2. d4 f5
French Defense: Franco-Hiva Gambit Accepted: 1. e4 e6 2. d4 f5 3. exf5
French Defense: Mediterranean Defense: 1. e4 e6 2. d4 Nf6
Rat Defense: Small Center Defense: 1. e4 e6 2. e4 d6
French Defense: Steinitz Attack: 1. e4 e6 2. e5
French Defense: La Bourdonnais Variation: 1. e4 e6 2. f4
French Defense: La Bourdonnais Variation, Reuter Gambit: 1. e4 e6 2. f4 d5 3. Nf3 dxe4
French Defense: Réti-Spielmann Attack: 1. e4 e6 2. g3
French Defense: Queen's Knight: 1. e4 e6 2. Nc3
French Defense: Pelikan Variation: 1. e4 e6 2. Nc3 d5 3. f4
French Defense: Knight Variation: 1. e4 e6 2. Nf3
French Defense: Wing Gambit: 1. e4 e6 2. Nf3 d5 3. e5 c5 4. b4
French Defense: Two Knights Variation: 1. e4 e6 2. Nf3 d5 3. Nc3
French Defense: Knight Variation, Franco-Hiva Gambit: 1. e4 e6 2. Nf3 f5
French Defense: Chigorin Variation: 1. e4 e6 2. Qe2

C01 French, Exchange Variation
French Defense: Exchange Variation: 1. e4 e6 2. d4 d5 3. exd5
French Defense: Exchange Variation, Monte Carlo Variation: 1. e4 e6 2. d4 d5 3. exd5 exd5 4. c4
French Defense: Exchange Variation, Bogoljubow Variation: 1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nc3 Nf6 5. Bg5 Nc6
French Defense: Exchange Variation, Svenonius Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. exd5 exd5 5. Bg5

C02 French, Advance Variation
French Defense: Advance Variation: 1. e4 e6 2. d4 d5 3. e5
French Defense: Advance Variation, Extended Bishop Swap: 1. e4 e6 2. d4 d5 3. e5 Bd7
French Defense: Advance Variation: 1. e4 e6 2. d4 d5 3. e5 c5
French Defense: Advance Variation, Frenkel Gambit: 1. e4 e6 2. d4 d5 3. e5 c5 4. b4
French Defense: Advance Variation: 1. e4 e6 2. d4 d5 3. e5 c5 4. c3
French Defense: Advance Variation: 1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6
French Defense: Advance Variation, Paulsen Attack: 1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3
French Defense: Advance Variation, Euwe Variation: 1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Bd7
French Defense: Advance Variation, Main Line: 1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. a3
French Defense: Advance Variation, Lputian Variation: 1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. a3 Nh6
French Defense: Advance Variation, Milner-Barry Gambit: 1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. Bd3
French Defense: Advance Variation, Wade Variation: 1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Qb6 5. Nf3 Bd7
French Defense: Advance Variation, Steinitz Variation: 1. e4 e6 2. d4 d5 3. e5 c5 4. dxc5
French Defense: Advance Variation, Nimzowitsch System: 1. e4 e6 2. d4 d5 3. e5 c5 4. Nf3
French Defense: Advance Variation, Ruisdonk Gambit: 1. e4 e6 2. d4 d5 3. e5 c5 4. Nf3 cxd4 5. Bd3
French Defense: Advance Variation, Nimzowitsch Attack: 1. e4 e6 2. d4 d5 3. e5 c5 4. Qg4
French Defense: Advance Variation, Nimzowitsch Gambit: 1. e4 e6 2. d4 d5 3. e5 c5 4. Qg4 cxd4 5. Nf3

C03 French, Tarrasch
French Defense: Tarrasch Variation: 1. e4 e6 2. d4 d5 3. Nd2
French Defense: Tarrasch Variation, Modern System: 1. e4 e6 2. d4 d5 3. Nd2 a6
French Defense: Tarrasch Variation, Morozevich Variation: 1. e4 e6 2. d4 d5 3. Nd2 Be7
French Defense: Tarrasch Variation, Haberditz Variation: 1. e4 e6 2. d4 d5 3. Nd2 f5
French Defense: Tarrasch Variation, Guimard Defense: 1. e4 e6 2. d4 d5 3. Nd2 Nc6
French Defense: Guimard Variation, Thunderbunny Variation: 1. e4 e6 2. d4 d5 3. Nd2 Nc6 4. c3 dxe4 5. Nxe4 e5

C04 French, Tarrasch, Guimard Main line
French Defense: Tarrasch Variation, Guimard Defense, Main Line: 1. e4 e6 2. d4 d5 3. Nd2 Nc6 4. Ngf3 Nf6

C05 French, Tarrasch, Closed Variation
French Defense: Tarrasch Variation, Closed Variation: 1. e4 e6 2. d4 d5 3. Nd2 Nf6
French Defense: Tarrasch Variation, Botvinnik Variation: 1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 b6
French Defense: Tarrasch Variation, Closed Variation: 1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6
French Defense: Tarrasch Variation, Pawn Center Variation: 1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. f4

C06 French, Tarrasch, Closed Variation, Main line
French Defense: Tarrasch Variation, Closed Variation, Main Line: 1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ne2 cxd4 8. cxd4
French Defense: Tarrasch Variation, Leningrad Variation: 1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ne2 cxd4 8. cxd4 Nb6

C07 French, Tarrasch, Open Variation
French Defense: Tarrasch Variation, Open System: 1. e4 e6 2. d4 d5 3. Nd2 c5
French Defense: Tarrasch Variation, Open System, Süchting Line: 1. e4 e6 2. d4 d5 3. Nd2 c5 4. c3
French Defense: Tarrasch Variation, Open System, Shaposhnikov Gambit: 1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 Nf6
French Defense: Tarrasch Variation, Chistyakov Defense: 1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 Qxd5
French Defense: Tarrasch Variation, Chistyakov Defense, Modern Line: 1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 Qxd5 5. Ngf3 cxd4 6. Bc4 Qd6 7. O-O Nf6 8. Nb3 Nc6 9. Nbxd4 Nxd4 10. Nxd4 a6
French Defense: Tarrasch Variation, Eliskases Variation: 1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 Qxd5 5. Ngf3 cxd4 6. Bc4 Qd8
French Defense: Tarrasch Variation, Open System, Euwe-Keres Line: 1. e4 e6 2. d4 d5 3. Nd2 c5 4. Ngf3

C08 French, Tarrasch, Open, 4.exd5 exd5
French Defense: Tarrasch Variation, Open System: 1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 exd5
French Defense: Tarrasch Variation, Open System, Advance Line: 1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 exd5 5. Ngf3 c4

C09 French, Tarrasch, Open Variation, Main line
French Defense: Tarrasch Variation, Open System, Main Line: 1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 exd5 5. Ngf3 Nc6

C10 French, Paulsen Variation
Sicilian Defense: Marshall Gambit: 1. e4 c5 2. Nc3 e6 3. d4 d5
French Defense: Paulsen Variation: 1. e4 e6 2. d4 d5 3. Nc3
French Defense: Rubinstein Variation: 1. e4 e6 2. d4 d5 3. Nc3 dxe4
French Defense: Rubinstein Variation, Fort Knox Variation: 1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bd7 5. Nf3 Bc6
French Defense: Rubinstein Variation, Ellis Gambit: 1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 e5
French Defense: Rubinstein Variation, Blackburne Defense: 1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7
French Defense: Rubinstein Variation, Capablanca Line: 1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 5. Nf3 Ngf6 6. Nxf6+ Nxf6 7. Ne5
French Defense: Rubinstein Variation, Maric Variation: 1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Qd5
French Defense: Classical Variation, Svenonius Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nc6 4. exd5
French Defense: Rubinstein Variation, Kasparov Attack: 1. e4 e6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Nd7 5. Nf3 Ngf6 6. Nxf6+ Nxf6 7. c3

C11 French Defence
French Defense: Steinitz Variation: 1. e4 e6 2. d4 d5 3. Nc3 a6 4. Nf3 Nf6 5. e5 Nfd7
French Defense: Steinitz Variation: 1. e4 e6 2. d4 d5 3. Nc3 a6 4. Nf3 Nf6 5. e5 Nfd7 6. a3
French Defense: Steinitz Variation: 1. e4 e6 2. d4 d5 3. Nc3 a6 4. Nf3 Nf6 5. e5 Nfd7 6. Ne2
French Defense: Classical Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6
French Defense: Classical Variation, Swiss Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bd3
French Defense: Henneberger Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Be3
French Defense: Burn Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5
French Defense: Classical Variation, Burn Variation, Main Line: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4 5. Nxe4 Be7 6. Bxf6 Bxf6 7. Nf3 O-O
French Defense: Classical Variation, Burn Variation, Morozevich Line: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4 5. Nxe4 Be7 6. Bxf6 gxf6
French Defense: Classical Variation, Steinitz Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5
French Defense: Steinitz Variation, Bradford Attack Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. dxc5 Bxc5 7. Qg4
French Defense: Steinitz Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. dxc5 Nc6
French Defense: Steinitz Variation, Brodsky-Jones Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. dxc5 Nc6 7. a3 Bxc5 8. Qg4 O-O 9. Nf3 f6
French Defense: Steinitz Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3
French Defense: Steinitz Variation, Boleslavsky Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Be3
French Defense: Steinitz Variation, Gledhill Attack: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. Qg4
French Defense: Classical Variation, Delayed Exchange Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. exd5

C12 French, MacCutcheon Variation
French Defense: MacCutcheon Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4
French Defense: MacCutcheon Variation, Advance Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5
French Defense: MacCutcheon Variation, Dr. Olland Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bc1
French Defense: MacCutcheon Variation, Lasker Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bd2 Bxc3
French Defense: MacCutcheon Variation, Lasker Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bd2 Bxc3 7. bxc3 Ne4 8. Qg4 g6
French Defense: MacCutcheon Variation, Tartakower Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bd2 Nfd7
French Defense: MacCutcheon Variation, Janowski Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Be3
French Defense: MacCutcheon Variation, Bernstein Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bh4
French Defense: MacCutcheon Variation, Chigorin Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. exf6
French Defense: MacCutcheon Variation, Grigoriev Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. exf6 hxg5 7. fxg7 Rg8 8. h4 gxh4 9. Qg4
French Defense: MacCutcheon Variation, Exchange Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. exd5
French Defense: MacCutcheon Variation, Bogoljubow Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. exd5 Qxd5 6. Bxf6 gxf6 7. Qd2 Qa5
French Defense: MacCutcheon Variation, Duras Variation: 1. e4 e6 2. Nc3 d5 3. d4 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bd2 Bxc3 7. bxc3 Ne4 8. Qg4 Kf8 9. Bc1

C13 French, Classical
French Defense: Classical Variation, Normal Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7
French Defense: Classical Variation, Richter Attack: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. Bxf6
French Defense: Classical Variation, Richter Attack: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. Bxf6 Bxf6 6. e5 Be7 7. Qg4
French Defense: Classical Variation, Tartakower Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Ne4
French Defense: Alekhine-Chatard Attack: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. h4
French Defense: Alekhine-Chatard Attack, Maróczy Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. h4 a6
French Defense: Alekhine-Chatard Attack, Albin-Chatard Gambit: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. h4 Bxg5 7. hxg5 Qxg5
French Defense: Alekhine-Chatard Attack, Breyer Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. h4 c5
French Defense: Alekhine-Chatard Attack, Teichmann Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. h4 f6
French Defense: Alekhine-Chatard Attack, Spielmann Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. h4 O-O
French Defense: Classical Variation, Vistaneckis Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Ng8
French Defense: Classical Variation, Frankfurt Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Ng8 6. Be3 b6

C14 French, Classical Variation
French Defense: Classical Variation: 1. e4 e6 2. d4 d5 3. Nc3 a6 4. Nf3 Nf6 5. e5 Nfd7 6. Bg5
French Defense: Classical Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7
French Defense: Classical Variation, Tarrasch Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. Bd3
French Defense: Classical Variation, Steinitz Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. f4
French Defense: Classical Variation, Stahlberg Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. f4 O-O 8. Nf3 c5 9. Qd2 Nc6 10. O-O-O c4
French Defense: Classical Variation, Alapin Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. Nb5
French Defense: Classical Variation, Rubinstein Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. Qd2
French Defense: Classical Variation, Pollock Variation: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. Qg4

C15 French, Winawer (Nimzovich) Variation
French Defense: Winawer Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4
French Defense: Winawer Variation, Winckelmann-Reimer Gambit: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 dxe4 6. f3
French Defense: Winawer Variation, Fingerslip Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Bd2
French Defense: Winawer Variation, Fingerslip Variation, Main Line: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Bd2 dxe4 5. Qg4 Nf6 6. Qxg7 Rg8 7. Qh6
French Defense: Winawer Variation, Fingerslip Variation, Kunin Double Gambit: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Bd2 dxe4 5. Qg4 Qxd4
French Defense: Winawer Variation, Fingerslip Variation, Schwarz's Line: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Bd2 Ne7 5. Nb1
French Defense: Winawer Variation, Kondratiyev Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Bd3 c5 5. exd5 Qxd5 6. Bd2
French Defense: Winawer Variation, Delayed Exchange Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. exd5
French Defense: Winawer Variation, Exchange Variation, Canal Attack: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. exd5 exd5 5. Bd3 Ne7 6. Qh5
French Defense: Winawer Variation, Alekhine-Maróczy Gambit: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Ne2
French Defense: Winawer Variation, Alekhine Gambit, Alatortsev Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Ne2 dxe4 5. a3 Be7 6. Nxe4 Nf6 7. N2g3 O-O 8. Be2 Nc6
French Defense: Winawer Variation, Alekhine Gambit Accepted: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Ne2 dxe4 5. a3 Bxc3+
French Defense: Winawer Variation, Alekhine Gambit, Kan Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Ne2 dxe4 5. a3 Bxc3+ 6. Nxc3 Nc6
French Defense: MacCutcheon Variation, Wolf Gambit: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Ne2 Nf6 5. Bg5

C16 French, Winawer, Advance Variation
French Defense: Winawer Variation, Advance Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5
French Defense: Winawer Variation, Petrosian Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 Qd7

C17 French, Winawer, Advance Variation
French Defense: Winawer Variation, Advance Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5
French Defense: Winawer Variation, Advance Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3
French Defense: Winawer Variation, Retreat Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Ba5
French Defense: Winawer Variation, Retreat Variation, Armenian Line: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Ba5 6. b4 cxd4
French Defense: Winawer Variation, Marózy-Wallis Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 cxd4 6. axb4 dxc3
French Defense: Winawer Variation, Advance Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 cxd4 6. axb4 dxc3 7. Nf3
French Defense: Winawer Variation, Bogoljubow Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. Bd2
French Defense: Winawer Variation, Bogoljubow Variation, Icelandic Defense: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. Bd2 Ne7 6. f4
French Defense: Winawer Variation, Advance Variation, Moscow Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. Qg4

C18 French, Winawer, Advance Variation
French Defense: Winawer Variation, Advance Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3
French Defense: Winawer Variation, Portisch-Hook Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Qa5
French Defense: Winawer Variation, Classical Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Qc7

C19 French, Winawer, Advance, 6...Ne7
French Defense: Winawer Variation, Advance Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7
French Defense: Winawer Variation, Advance Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. a4
French Defense: Winawer Variation, Positional Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Nf3
French Defense: Winawer Variation, Poisoned Pawn Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Qg4
French Defense: Winawer Variation, Poisoned Pawn Variation, Paoli Variation: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Qg4 Qc7 8. Qxg7 Rg8 9. Qxh7 cxd4 10. Kd1
French Defense: Winawer Variation, Poisoned Pawn Variation, Main Line: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Qg4 Qc7 8. Qxg7 Rg8 9. Qxh7 cxd4 10. Ne2

C20–C99

1.e4 e5: Open Game

C20 King's Pawn Game (includes Alapin's Opening, Centre Pawn Opening, Napoleon Opening, Portuguese Opening, Danvers Opening, Bongcloud Attack)
King's Pawn Game: 1. e4 e5
King's Pawn Game: Mengarini's Opening: 1. e4 e5 2. a3
King's Pawn Opening: 1. e4 e5 2. b3
Portuguese Opening: 1. e4 e5 2. Bb5
Portuguese Opening: Miguel Gambit: 1. e4 e5 2. Bb5 Bc5 3. b4
Portuguese Opening: Portuguese Gambit: 1. e4 e5 2. Bb5 Nf6 3. d4
King's Pawn Game: Tortoise Opening: 1. e4 e5 2. Bd3
King's Pawn Game: MacLeod Attack: 1. e4 e5 2. c3
King's Pawn Game: MacLeod Attack, Norwalde Gambit: 1. e4 e5 2. c3 d5 3. Qh5 Bd6
King's Pawn Game: MacLeod Attack, Lasa Gambit: 1. e4 e5 2. c3 f5
English Opening: The Whale: 1. e4 e5 2. c4
King's Pawn Game: Bavarian Gambit: 1. e4 e5 2. c4 d5
King's Pawn Game: Leonardis Variation: 1. e4 e5 2. d3
King's Pawn Game: Weber Gambit: 1. e4 e5 2. d3 d5 3. exd5 c6 4. dxc6 Nxc6
King's Pawn Game: Clam Variation, King's Gambit Reversed: 1. e4 e5 2. d3 f5
King's Pawn Game: Clam Variation, Radisch Gambit: 1. e4 e5 2. d3 Nf6 3. f4 Bc5
Center Game: 1. e4 e5 2. d4
King's Pawn Game: Beyer Gambit: 1. e4 e5 2. d4 d5
King's Pawn Game: Philidor Gambit: 1. e4 e5 2. d4 d6 3. dxe5 Bd7
King's Pawn Game: King's Head Opening: 1. e4 e5 2. f3
King's Pawn Game: King's Head Opening: 1. e4 e5 2. f3 Nf6 3. Nc3
Bongcloud Attack: 1. e4 e5 2. Ke2
King's Pawn Game: Alapin Opening: 1. e4 e5 2. Ne2
King's Pawn Opening: Van Hooydoon Gambit: 1. e4 e5 2. Qe2 Nc6 3. c3 Nf6 4. Nf3 Bc5 5. d4 exd4 6. cxd4 Nxd4
King's Pawn Game: Napoleon Attack: 1. e4 e5 2. Qf3
King's Pawn Opening: Speers: 1. e4 e5 2. Qg4 Nf6 3. Qf5
King's Pawn Game: Wayward Queen Attack (Danvers Opening) : 1. e4 e5 2. Qh5
King's Pawn Game: Wayward Queen Attack, Mellon Gambit: 1. e4 e5 2. Qh5 Nc6 3. Bc4 Nh6 4. d3 g6 5. Qf3 f6 6. Ne2 d5
King's Pawn Game: Wayward Queen Attack, Kiddie Countergambit: 1. e4 e5 2. Qh5 Nf6
Barnes Opening: Walkerling: 1. f3 e5 2. e4 Nf6 3. Bc4

C21 Center Game (includes Danish Gambit)
Center Game Accepted: 1. e4 e5 2. d4 exd4
Center Game: von der Lasa Gambit: 1. e4 e5 2. d4 exd4 3. Bc4
Center Game: Ross Gambit: 1. e4 e5 2. d4 exd4 3. Bd3
Danish Gambit: 1. e4 e5 2. d4 exd4 3. c3
Danish Gambit Declined: Sorensen Defense: 1. e4 e5 2. d4 exd4 3. c3 d5
Danish Gambit Accepted: 1. e4 e5 2. d4 exd4 3. c3 dxc3
Danish Gambit Accepted: Copenhagen Defense: 1. e4 e5 2. d4 exd4 3. c3 dxc3 4. Bc4 cxb2 5. Bxb2 Bb4+
Danish Gambit Accepted: Schlechter Defense: 1. e4 e5 2. d4 exd4 3. c3 dxc3 4. Bc4 cxb2 5. Bxb2 d5
Danish Gambit Accepted: Classical Defense: 1. e4 e5 2. d4 exd4 3. c3 dxc3 4. Bc4 cxb2 5. Bxb2 Nf6
Danish Gambit Accepted: Chigorin Defense: 1. e4 e5 2. d4 exd4 3. c3 dxc3 4. Bc4 cxb2 5. Bxb2 Qe7
Danish Gambit Accepted: Svenonius Defense: 1. e4 e5 2. d4 exd4 3. c3 Ne7
Center Game: Halasz-McDonnell Gambit: 1. e4 e5 2. d4 exd4 3. f4
Center Game: Halasz-McDonnell Gambit, Crocodile Variation: 1. e4 e5 2. d4 exd4 3. f4 Bc5 4. Nf3 Nc6 5. c3
Center Game: Kieseritzky Variation: 1. e4 e5 2. d4 exd4 3. Nf3
Center Game: Lanc-Arnold Gambit: 1. e4 e5 2. d4 exd4 3. Nf3 Bc5 4. c3
Center Game: Lanc-Arnold Gambit, Schippler Gambit: 1. e4 e5 2. d4 exd4 3. Nf3 Bc5 4. c3 dxc3 5. Bc4
Center Game: Kieseritzky Variation: 1. e4 e5 2. d4 exd4 3. Nf3 c5
Center Game: Kieseritzky Variation: 1. e4 e5 2. d4 exd4 3. Nf3 c5 4. Bc4
Center Game: 1. e4 e5 2. d4 exd4 3. Qxd4

C22 Center Game
Center Game: Normal Variation: 1. e4 e5 2. d4 exd4 3. Qxd4 Nc6
Center Game: Hall Variation: 1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qc4
Center Game: Paulsen Attack Variation: 1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3
Center Game: Charousek Variation: 1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3 Bb4+ 5. c3 Be7
Center Game: l'Hermet Variation: 1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3 f5
Center Game: Berger Variation: 1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3 Nf6
Center Game: Kupreichik Variation: 1. e4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe3 Nf6 5. Nc3 Bb4 6. Bd2 O-O 7. O-O-O Re8 8. Bc4 d6 9. Nh3

C23 Bishop's Opening
Bishop's Opening: 1. e4 e5 2. Bc4
Bishop's Opening: Anderssen Gambit: 1. e4 e5 2. Bc4 b5 3. Bxb5 c6
Bishop's Opening: Thorold Gambit: 1. e4 e5 2. Bc4 b5 3. Bxb5 f5
Bishop's Opening: Boi Variation: 1. e4 e5 2. Bc4 Bc5
Bishop's Opening: McDonnell Gambit: 1. e4 e5 2. Bc4 Bc5 3. b4
Bishop's Opening: McDonnell Gambit, La Bourdonnais-Denker Gambit: 1. e4 e5 2. Bc4 Bc5 3. b4 Bxb4 4. c3
Bishop's Opening: McDonnell Gambit, McDonnell Double Gambit: 1. e4 e5 2. Bc4 Bc5 3. b4 Bxb4 4. f4
Bishop's Opening: Four Pawns Gambit: 1. e4 e5 2. Bc4 Bc5 3. b4 Bxb4 4. f4 exf4 5. Nf3 Be7 6. d4 Bh4+ 7. g3 fxg3 8. O-O gxh2+ 9. Kh1
Bishop's Opening: Philidor Variation: 1. e4 e5 2. Bc4 Bc5 3. c3
Bishop's Opening: Lewis Countergambit: 1. e4 e5 2. Bc4 Bc5 3. c3 d5
Bishop's Opening: Lewis Countergambit: 1. e4 e5 2. Bc4 Bc5 3. c3 d5 4. Bxd5 Nf6
Bishop's Opening: Lewis Countergambit, Walker Variation: 1. e4 e5 2. Bc4 Bc5 3. c3 d5 4. Bxd5 Nf6 5. d4
Bishop's Opening: Pratt Variation: 1. e4 e5 2. Bc4 Bc5 3. c3 Nf6 4. d4 exd4 5. e5 d5 6. exf6 dxc4 7. Qh5 O-O
Bishop's Opening: del Rio Variation: 1. e4 e5 2. Bc4 Bc5 3. c3 Qg5
Bishop's Opening: Lewis Gambit: 1. e4 e5 2. Bc4 Bc5 3. d4
Bishop's Opening: Stein Gambit: 1. e4 e5 2. Bc4 Bc5 3. f4
Bishop's Opening: Lopez Variation: 1. e4 e5 2. Bc4 Bc5 3. Qe2
Bishop's Opening: Lopez Gambit: 1. e4 e5 2. Bc4 Bc5 3. Qe2 Nc6 4. c3 Nf6 5. f4
Bishop's Opening: Lopez Variation, Lopez Gambit: 1. e4 e5 2. Bc4 Bc5 3. Qe2 Nf6 4. f4
Bishop's Opening: Philidor Counterattack: 1. e4 e5 2. Bc4 c6
Bishop's Opening: Lisitsyn Variation: 1. e4 e5 2. Bc4 c6 3. d4 d5 4. exd5 cxd5 5. Bb5+ Bd7 6. Bxd7+ Nxd7 7. dxe5 Nxe5 8. Ne2
Bishop's Opening: Khan Gambit: 1. e4 e5 2. Bc4 d5
Bishop's Opening: Calabrese Countergambit: 1. e4 e5 2. Bc4 f5
Bishop's Opening: Calabrese Countergambit, Jaenisch Variation: 1. e4 e5 2. Bc4 f5 3. d3

C24 Bishop's Opening, Berlin Defence
Bishop's Opening: Berlin Defense: 1. e4 e5 2. Bc4 Nf6
Bishop's Opening: Kitchener Folly: 1. e4 e5 2. Bc4 Nf6 3. d3 Be7 4. Nf3 O-O
Bishop's Opening: Vienna Hybrid: 1. e4 e5 2. Bc4 Nf6 3. d3 Nc6 4. Nc3
Bishop's Opening: Ponziani Gambit: 1. e4 e5 2. Bc4 Nf6 3. d4
Bishop's Opening: Warsaw Gambit: 1. e4 e5 2. Bc4 Nf6 3. d4 exd4 4. c3
Bishop's Opening: Urusov Gambit, Panov Variation: 1. e4 e5 2. Bc4 Nf6 3. d4 exd4 4. Nf3 d5 5. exd5 Bb4+ 6. c3 Qe7+
Bishop's Opening: Krejcik Gambit: 1. e4 e5 2. Bc4 Nf6 3. f3 Bc5 4. Ne2 Nc6 5. b4
Bishop's Opening: Berlin Defense, Greco Gambit: 1. e4 e5 2. Bc4 Nf6 3. f4
Bishop's Opening: Pachman Gambit: 1. e4 e5 2. Bc4 Nf6 3. Ne2 Nxe4 4. Nec3

C25 Vienna Game
Vienna Gambit, with Max Lange Defense: Hamppe-Allgaier Gambit, Thorold Variation: 1. e4 e5 2. f4 exf4 3. Nf3 Nc6 4. Nc3 g5 5. h4 g4 6. Ng5 h6 7. Nxf7 Kxf7 8. d4
Vienna Game: 1. e4 e5 2. Nc3
Vienna Game: Zhuravlev Countergambit: 1. e4 e5 2. Nc3 Bb4 3. Qg4 Nf6
Vienna Game: Anderssen Defense: 1. e4 e5 2. Nc3 Bc5
Vienna Game: Hamppe-Meitner Variation: 1. e4 e5 2. Nc3 Bc5 3. Na4
Vienna Game: Giraffe Attack: 1. e4 e5 2. Nc3 Bc5 3. Qg4
Vienna Game: Omaha Gambit: 1. e4 e5 2. Nc3 d6 3. f4
Vienna Game: Max Lange Defense: 1. e4 e5 2. Nc3 Nc6
Vienna Game: Stanley Variation, Meitner-Mieses Gambit: 1. e4 e5 2. Nc3 Nc6 3. Bc4 Bc5 4. Qg4 Qf6 5. Nd5
Vienna Game: Fyfe Gambit: 1. e4 e5 2. Nc3 Nc6 3. d4
Vienna Game: Philidor Countergambit: 1. e4 e5 2. Nc3 Nc6 3. d4 f5
Vienna Gambit, with Max Lange Defense: 1. e4 e5 2. Nc3 Nc6 3. f4
Vienna Gambit, with Max Lange Defense: Quelle Gambit: 1. e4 e5 2. Nc3 Nc6 3. f4 Bc5 4. fxe5 d6
Vienna Gambit, with Max Lange Defense: Steinitz Gambit: 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. d4
Vienna Gambit, with Max Lange Defense: Steinitz Gambit, Main Line: 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. d4 Qh4+ 5. Ke2
Vienna Gambit, with Max Lange Defense: Steinitz Gambit, Fraser-Minckwitz Defense: 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. d4 Qh4+ 5. Ke2 b6
Vienna Gambit, with Max Lange Defense: Steinitz Gambit, Zukertort Defense: 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. d4 Qh4+ 5. Ke2 d5
Vienna Gambit, with Max Lange Defense: Steinitz Gambit, Paulsen Defense: 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. d4 Qh4+ 5. Ke2 d6
Vienna Gambit, with Max Lange Defense: Steinitz Gambit, Sörensen Defense: 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. d4 Qh4+ 5. Ke2 g5
Vienna Gambit, with Max Lange Defense: Knight Variation: 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3
Vienna Gambit, with Max Lange Defense: Cunningham Defense: 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 Be7
Vienna Game: Hamppe-Muzio Gambit: 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. Bc4 g4 6. O-O
Vienna Gambit, with Max Lange Defense: Hamppe-Muzio Gambit: 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. Bc4 g4 6. O-O gxf3
Vienna Game: Hamppe-Muzio, Dubois Variation: 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. Bc4 g4 6. O-O gxf3 7. Qxf3 Ne5 8. Qxf4 Qf6
Vienna Gambit, with Max Lange Defense: Pierce Gambit: 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. d4
Vienna Game: Pierce Gambit, Rushmere Attack: 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. d4 g4 6. Bc4 gxf3 7. O-O d5 8. exd5 Bg4 9. dxc6
Vienna Gambit, with Max Lange Defense: Hamppe-Allgaier Gambit: 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. h4 g4 6. Ng5
Vienna Gambit, with Max Lange Defense: Hamppe-Allgaier Gambit, Alapin Variation: 1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 g5 5. h4 g4 6. Ng5 d6
Vienna Game: Paulsen Variation: 1. e4 e5 2. Nc3 Nc6 3. g3
Vienna Game: Paulsen Variation, Mariotti Gambit: 1. e4 e5 2. Nc3 Nc6 3. g3 Bc5 4. Bg2 h5 5. Nf3 h4
Vienna Game: Paulsen Variation: 1. e4 e5 2. Nc3 Nc6 3. g3 Nf6 4. Bg2 Bc5 5. Nge2 d5

C26 Vienna Game, Falkbeer Variation
Bishop's Opening: Horwitz Gambit: 1. e4 e5 2. Bc4 Nf6 3. Nc3 b5
Vienna Game: Falkbeer Variation: 1. e4 e5 2. Nc3 Nf6
Vienna Game: Mengarini Variation: 1. e4 e5 2. Nc3 Nf6 3. a3
Vienna Game: Stanley Variation: 1. e4 e5 2. Nc3 Nf6 3. Bc4
Vienna Game: Stanley Variation, Reversed Spanish: 1. e4 e5 2. Nc3 Nf6 3. Bc4 Bb4
Bishop's Opening: Vienna Hybrid, Spielmann Attack: 1. e4 e5 2. Nc3 Nf6 3. Bc4 Bc5 4. d3
Vienna Game: Stanley Variation, Eifel Gambit: 1. e4 e5 2. Nc3 Nf6 3. Bc4 Bc5 4. Nge2 b5
Vienna Game: Mieses Variation: 1. e4 e5 2. Nc3 Nf6 3. g3
Vienna Game: Paulsen Variation, Pollock Gambit: 1. e4 e5 2. Nc3 Nf6 3. g3 Bc5 4. Bg2 Nc6 5. Nge2 d5 6. exd5
Vienna Game: Mieses Variation, Erben Gambit: 1. e4 e5 2. Nc3 Nf6 3. g3 d5 4. exd5 c6

C27 Vienna Game, Frankenstein–Dracula Variation
Vienna Game: Frankenstein-Dracula Variation: 1. e4 e5 2. Nc3 Nf6 3. Bc4 Nxe4
Vienna Game: Stanley Variation, Monster Declined: 1. e4 e5 2. Nc3 Nf6 3. Bc4 Nxe4 4. Qh5 Nd6 5. Bb3 Be7
Vienna Game: Stanley Variation, Alekhine Variation: 1. e4 e5 2. Nc3 Nf6 3. Bc4 Nxe4 4. Qh5 Nd6 5. Bb3 Be7 6. Nf3 Nc6 7. Nxe5
Vienna Game: Adams' Gambit: 1. e4 e5 2. Nc3 Nf6 3. Bc4 Nxe4 4. Qh5 Nd6 5. Bb3 Nc6 6. d4
Vienna Game: Stanley Variation, Frankenstein-Dracula Variation: 1. e4 e5 2. Nc3 Nf6 3. Bc4 Nxe4 4. Qh5 Nd6 5. Bb3 Nc6 6. Nb5 g6 7. Qf3 f5 8. Qd5 Qe7 9. Nxc7+ Kd8 10. Nxa8 b6
Bishop's Opening: Boden-Kieseritzky Gambit: 1. e4 e5 2. Nf3 Nf6 3. Bc4 Nxe4 4. Nc3
Bishop's Opening: Boden-Kieseritzky Gambit, Lichtenhein Defense: 1. e4 e5 2. Nf3 Nf6 3. Bc4 Nxe4 4. Nc3 d5

C28 Vienna Game
Vienna Game: Stanley Variation, Three Knights Variation: 1. e4 e5 2. Nc3 Nc6 3. Bc4 Nf6
Bishop's Opening: Vienna Hybrid, Hromádka Variation: 1. e4 e5 2. Nc3 Nc6 3. Bc4 Nf6 4. d3 Bb4 5. Ne2
Vienna Game: Stanley Variation, Bronstein Gambit: 1. e4 e5 2. Nc3 Nc6 3. Bc4 Nf6 4. f4 Nxe4 5. Nf3

C29 Vienna Gambit, Kaufmann Variation including Würzburger Trap
Vienna Game: Vienna Gambit: 1. e4 e5 2. Nc3 Nf6 3. f4
Vienna Game: Vienna Gambit, Main Line: 1. e4 e5 2. Nc3 Nf6 3. f4 d5
Vienna Game: Vienna Gambit, Steinitz Variation: 1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. d3
Vienna Game: Vienna Gambit, Modern Variation: 1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. d3
Vienna Game: Vienna Gambit, Wurzburger Trap: 1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. d3 Qh4+ 6. g3 Nxg3 7. Nf3 Qh5 8. Nxd5
Vienna Game: Vienna Gambit, Breyer Variation: 1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. Nf3 Be7
Vienna Game: Vienna Gambit, Kaufmann Variation: 1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. Nf3 Bg4 6. Qe2
Vienna Game: Vienna Gambit, Paulsen Attack: 1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. Qf3
Vienna Game: Vienna Gambit, Bardeleben Variation: 1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. Qf3 f5
Vienna Game: Heyde Variation: 1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. Qf3 f5 6. d4

C30 King's Gambit
King's Gambit Declined: Mafia Defense: 1. e4 c5 2. f4 e5
King's Gambit Declined: Classical, Svenonius Variation: 1. e4 e5 2. Bc4 Nc6 3. Nc3 Nf6 4. d3 Bc5 5. f4 d6 6. Nf3 Bg4 7. h3 Bxf3 8. Qxf3 exf4
King's Gambit: 1. e4 e5 2. f4
King's Gambit Declined: Classical Variation: 1. e4 e5 2. f4 Bc5
King's Gambit Declined: Classical Variation, Rotlewi Countergambit: 1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. b4
King's Gambit Declined: Classical Variation: 1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. c3
King's Gambit Declined: Classical Variation, Euwe Attack: 1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. c3 Bg4 5. fxe5 dxe5 6. Qa4+
King's Gambit Declined: Classical Variation, Rubinstein Countergambit: 1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. c3 f5
King's Gambit Declined: Classical, Réti Variation: 1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. c3 f5 5. fxe5 dxe5 6. d4 exd4 7. Bc4
King's Gambit Declined: Classical, Soldatenkov Variation: 1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. fxe5
King's Gambit Declined: Classical, Hanham Variation: 1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. Nc3 Nd7
King's Gambit Declined: Senechaud Countergambit: 1. e4 e5 2. f4 Bc5 3. Nf3 g5
King's Gambit Declined: Panteldakis Countergambit: 1. e4 e5 2. f4 f5
King's Gambit Declined: Panteldakis Countergambit, Schiller's Defense: 1. e4 e5 2. f4 f5 3. exf5 Bc5
King's Gambit Declined: Panteldakis Countergambit, Symmetrical Variation: 1. e4 e5 2. f4 f5 3. exf5 exf4 4. Nf3 d5 5. d4 Bd6 6. Bd3
King's Gambit Declined: Panteldakis Countergambit, Pawn Sacrifice Line: 1. e4 e5 2. f4 f5 3. exf5 exf4 4. Qh5+ g6 5. fxg6 Qe7+ 6. Kd1
King's Gambit Declined: Panteldakis Countergambit, Shirazi Line: 1. e4 e5 2. f4 f5 3. exf5 exf4 4. Qh5+ Ke7
King's Gambit Declined: Panteldakis Countergambit, Greco Variation: 1. e4 e5 2. f4 f5 3. exf5 Qh4+
King's Gambit Declined: Soller-Zilbermints Gambit: 1. e4 e5 2. f4 f6 3. fxe5 Nc6
King's Gambit Declined: Zilbermints Double Countergambit: 1. e4 e5 2. f4 g5
King's Gambit Declined: Queen's Knight Defense: 1. e4 e5 2. f4 Nc6
King's Gambit Declined: Miles Defense: 1. e4 e5 2. f4 Nc6 3. Nf3 f5
King's Gambit Declined: Zilbermints Double Gambit: 1. e4 e5 2. f4 Nc6 3. Nf3 g5
King's Gambit Declined: Hobbs-Zilbermints Gambit: 1. e4 e5 2. f4 Nc6 3. Nf3 g5 4. fxg5 h6
King's Gambit Declined: Petrov's Defense: 1. e4 e5 2. f4 Nf6
King's Gambit Declined: Norwalde Variation: 1. e4 e5 2. f4 Qf6
King's Gambit Declined: Norwalde Variation, Schubert Variation: 1. e4 e5 2. f4 Qf6 3. Nc3 Qxf4 4. d4
King's Gambit Declined: Norwalde Variation, Bücker Gambit: 1. e4 e5 2. f4 Qf6 3. Nc3 Qxf4 4. Nf3 Bb4 5. Bc4
King's Gambit Declined: Keene's Defense: 1. e4 e5 2. f4 Qh4+
King's Gambit Declined: Keene's Defense: 1. e4 e5 2. f4 Qh4+ 3. g3
King's Gambit Declined: Keene Defense: 1. e4 e5 2. f4 Qh4+ 3. g3 Qe7

C31 King's Gambit Declined, Falkbeer and Nimzowitsch (3...c6) Countergambits
King's Gambit Declined: Falkbeer Countergambit: 1. e4 e5 2. f4 d5
King's Gambit Declined: Falkbeer Countergambit, Hinrichsen Gambit: 1. e4 e5 2. f4 d5 3. d4
King's Gambit Declined: Falkbeer Countergambit Accepted: 1. e4 e5 2. f4 d5 3. exd5
King's Gambit Declined: Falkbeer Countergambit, Miles Gambit: 1. e4 e5 2. f4 d5 3. exd5 Bc5
King's Gambit Declined: Falkbeer Countergambit, Nimzowitsch-Marshall Countergambit: 1. e4 e5 2. f4 d5 3. exd5 c6
King's Gambit Declined: Falkbeer Countergambit, Pickler Gambit: 1. e4 e5 2. f4 d5 3. exd5 c6 4. dxc6 Bc5
King's Gambit Declined: Falkbeer Countergambit, Staunton Line: 1. e4 e5 2. f4 d5 3. exd5 e4
King's Gambit Declined: Falkbeer Countergambit, Anderssen Attack: 1. e4 e5 2. f4 d5 3. exd5 e4 4. Bb5+
King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit: 1. e4 e5 2. f4 d5 3. exd5 e4 4. d3
King's Gambit Declined: Falkbeer Countergambit, Rubinstein Variation: 1. e4 e5 2. f4 d5 3. exd5 e4 4. Nc3 Nf6 5. Qe2
King's Gambit Declined: Falkbeer Countergambit, Modern Transfer: 1. e4 e5 2. f4 d5 3. exd5 exf4
King's Gambit Declined: Falkbeer Countergambit, Milner-Barry Variation: 1. e4 e5 2. f4 d5 3. Nc3
Van Geet Opening: Grünfeld Defense, Steiner Gambit: 1. e4 e5 2. f4 d5 3. Nc3 dxe4 4. Nxe4
King's Gambit Declined: Falkbeer Countergambit, Blackburne Attack: 1. e4 e5 2. f4 d5 3. Nf3
King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit, Morphy Defense: 1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. exd5 e4 5. d3 Bb4 6. Bd2 e3

C32 King's Gambit Declined, Falkbeer, 5.dxe4
King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit Accepted: 1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. dxe4
King's Gambit Declined: Falkbeer Countergambit, Alapin Variation: 1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. dxe4 Nxe4 6. Nf3 Bc5 7. Qe2 Bf2+ 8. Kd1 Qxd5+ 9. Nfd2
King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit, Main Line: 1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. dxe4 Nxe4 6. Nf3 Bc5 7. Qe2 Bf5
King's Gambit Declined: Falkbeer Countergambit, Tarrasch Variation: 1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. dxe4 Nxe4 6. Nf3 Bc5 7. Qe2 Bf5 8. g4 O-O
King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit: 1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. dxe4 Nxe4 6. Qe2
King's Gambit Declined: Falkbeer Countergambit, Charousek Variation: 1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. dxe4 Nxe4 6. Qe2 Qxd5 7. Nd2 f5 8. g4
King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit, Keres Variation: 1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. Nd2
King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit, Old Line: 1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. Qe2

C33 King's Gambit Accepted
King's Gambit Accepted: 1. e4 e5 2. f4 exf4
King's Gambit Accepted: Orsini Gambit: 1. e4 e5 2. f4 exf4 3. b3
King's Gambit Accepted: Schurig Gambit, with Bb5: 1. e4 e5 2. f4 exf4 3. Bb5
King's Gambit Accepted: Bishop's Gambit: 1. e4 e5 2. f4 exf4 3. Bc4
King's Gambit Accepted: Bishop's Gambit, Kieseritzky Gambit: 1. e4 e5 2. f4 exf4 3. Bc4 b5
King's Gambit Accepted: Bishop's Gambit, Lopez Defense: 1. e4 e5 2. f4 exf4 3. Bc4 c6
King's Gambit Accepted: Bishop's Gambit, Bledow Variation: 1. e4 e5 2. f4 exf4 3. Bc4 d5
King's Gambit Accepted: Bishop's Gambit, Anderssen Variation: 1. e4 e5 2. f4 exf4 3. Bc4 d5 4. Bxd5 c6
King's Gambit Accepted: Bishop's Gambit, Bledow Countergambit: 1. e4 e5 2. f4 exf4 3. Bc4 d5 4. Bxd5 Nf6
King's Gambit Accepted: Bishop's Gambit, Boren-Svenonius Variation: 1. e4 e5 2. f4 exf4 3. Bc4 d5 4. Bxd5 Qh4+ 5. Kf1 Bd6
King's Gambit Accepted: Bishop's Gambit, Gianutio Gambit: 1. e4 e5 2. f4 exf4 3. Bc4 f5
King's Gambit Accepted: Lopez-Gianutio Countergambit, Hein Variation: 1. e4 e5 2. f4 exf4 3. Bc4 f5 4. Qe2 Qh4+ 5. Kd1 fxe4 6. Nc3 Kd8
King's Gambit Accepted: Bishop's Gambit, Anderssen Defense: 1. e4 e5 2. f4 exf4 3. Bc4 g5
King's Gambit Accepted: Bishop's Gambit, Maurian Defense: 1. e4 e5 2. f4 exf4 3. Bc4 Nc6
King's Gambit Accepted: Bishop's Gambit, Steinitz Defense: 1. e4 e5 2. f4 exf4 3. Bc4 Ne7
King's Gambit Accepted: Bishop's Gambit, Cozio Defense: 1. e4 e5 2. f4 exf4 3. Bc4 Nf6
King's Gambit Accepted: Bishop's Gambit, Bogoljubow Variation: 1. e4 e5 2. f4 exf4 3. Bc4 Nf6 4. Nc3
King's Gambit Accepted: Bishop's Gambit, Paulsen Attack: 1. e4 e5 2. f4 exf4 3. Bc4 Nf6 4. Nc3 Bb4 5. e5
King's Gambit Accepted: Bishop's Gambit, Bogoljubow Defense: 1. e4 e5 2. f4 exf4 3. Bc4 Nf6 4. Nc3 c6
King's Gambit Accepted: Bishop's Gambit, Bryan Countergambit: 1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 b5
King's Gambit Accepted: Bishop's Gambit, Greco Variation: 1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 Bc5
King's Gambit Accepted: Bishop's Gambit, Chigorin's Attack: 1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 d5 5. Bxd5 g5 6. g3
King's Gambit Accepted: Bishop's Gambit, Cozio Variation: 1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 d6
King's Gambit Accepted: Bishop's Gambit, Lopez Variation: 1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 g5
King's Gambit Accepted: Bishop's Gambit, Grimm Attack: 1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 g5 5. Nc3 Bg7 6. d4 d6 7. e5
King's Gambit Accepted: Bishop's Gambit, McDonnell Attack: 1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 g5 5. Nc3 Bg7 6. d4 Ne7 7. g3
King's Gambit Accepted: Bishop's Gambit, McDonnell Attack: 1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 g5 5. Nc3 Bg7 6. g3
King's Gambit Accepted: Bishop's Gambit, Fraser Variation: 1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 g5 5. Nc3 Bg7 6. g3 fxg3 7. Qf3
King's Gambit Accepted: Bishop's Gambit, Classical Defense, Cozio Attack: 1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 g5 5. Qf3
King's Gambit Accepted: Bishop's Gambit, Boden Variation: 1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 Nc6
King's Gambit Accepted: Bishop's Gambit, Classical Defense: 1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 Ne7 5. Nc3 g5 6. d4 Bg7
King's Gambit Accepted: Bishop's Gambit, First Jaenisch Variation: 1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 Nf6
King's Gambit Accepted: Schurig Gambit, with Bd3: 1. e4 e5 2. f4 exf4 3. Bd3
King's Gambit Accepted: Tartakower Gambit: 1. e4 e5 2. f4 exf4 3. Be2
King's Gambit Accepted: Tartakower Gambit, Weiss Defense: 1. e4 e5 2. f4 exf4 3. Be2 f5 4. exf5 d6
King's Gambit Accepted: Polerio Gambit: 1. e4 e5 2. f4 exf4 3. d4
King's Gambit Accepted: Gaga Gambit: 1. e4 e5 2. f4 exf4 3. g3
King's Gambit Accepted: Stamma Gambit: 1. e4 e5 2. f4 exf4 3. h4
King's Gambit Accepted: Tumbleweed: 1. e4 e5 2. f4 exf4 3. Kf2
King's Gambit Accepted: Mason-Keres Gambit: 1. e4 e5 2. f4 exf4 3. Nc3
King's Gambit Accepted: Paris Gambit: 1. e4 e5 2. f4 exf4 3. Ne2
King's Gambit Accepted: Eisenberg Variation: 1. e4 e5 2. f4 exf4 3. Nh3
King's Gambit Accepted: Basman Gambit: 1. e4 e5 2. f4 exf4 3. Qe2
King's Gambit Accepted: Breyer Gambit: 1. e4 e5 2. f4 exf4 3. Qf3
King's Gambit Accepted: Dodo Variation: 1. e4 e5 2. f4 exf4 3. Qg4
King's Gambit Accepted: Carrera Gambit: 1. e4 e5 2. f4 exf4 3. Qh5

C34 King's Gambit Accepted, including Fischer Defence
King's Gambit Accepted: King's Knight's Gambit: 1. e4 e5 2. f4 exf4 3. Nf3
King's Gambit Accepted: Fischer Defense: 1. e4 e5 2. f4 exf4 3. Nf3 d6
King's Gambit Accepted: Fischer Defense, Schulder Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 d6 4. b4
King's Gambit Accepted: Greco Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 d6 4. Bc4 h6 5. d4 g5 6. h4 Bg7
King's Gambit Accepted: Fischer Defense, Spanish Variation: 1. e4 e5 2. f4 exf4 3. Nf3 d6 4. d4 Nf6 5. Bd3
King's Gambit Accepted: Gianutio Countergambit: 1. e4 e5 2. f4 exf4 3. Nf3 f5
King's Gambit Accepted: King's Knight's Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5
King's Gambit Accepted: Wagenbach Defense: 1. e4 e5 2. f4 exf4 3. Nf3 h5
King's Gambit Accepted: Becker Defense: 1. e4 e5 2. f4 exf4 3. Nf3 h6
King's Gambit Accepted: MacLeod Defense: 1. e4 e5 2. f4 exf4 3. Nf3 Nc6
King's Gambit Accepted: Bonsch-Osmolovsky Variation: 1. e4 e5 2. f4 exf4 3. Nf3 Ne7
King's Gambit Accepted: Schallopp Defense: 1. e4 e5 2. f4 exf4 3. Nf3 Nf6
King's Gambit Accepted: Schallopp Defense, Tashkent Attack: 1. e4 e5 2. f4 exf4 3. Nf3 Nf6 4. e5 Nh5 5. g4

C35 King's Gambit Accepted, Cunningham Defence
King's Gambit Accepted: Cunningham Defense: 1. e4 e5 2. f4 exf4 3. Nf3 Be7
King's Gambit Accepted: Cunningham Defense, Bertin Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 Be7 4. Bc4 Bh4+ 5. g3
King's Gambit Accepted: Cunningham Defense, Bertin Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 Be7 4. Bc4 Bh4+ 5. g3 fxg3 6. O-O gxh2+ 7. Kh1
King's Gambit Accepted: Cunningham Defense, McCormick Defense: 1. e4 e5 2. f4 exf4 3. Nf3 Be7 4. Bc4 Nf6

C36 King's Gambit Accepted, Abbazia Defence (Classical Defence, Modern Defence)
King's Gambit Accepted: Modern Defense: 1. e4 e5 2. f4 exf4 3. Nf3 d5
King's Gambit Accepted: Modern Defense: 1. e4 e5 2. f4 exf4 3. Nf3 d5 4. exd5
King's Gambit Accepted: Abbazia Defense: 1. e4 e5 2. f4 exf4 3. Nf3 d5 4. exd5 Nf6
King's Gambit Accepted: Abbazia Defense, Main Line: 1. e4 e5 2. f4 exf4 3. Nf3 d5 4. exd5 Nf6 5. Bb5+ c6 6. dxc6 bxc6 7. Bc4 Nd5

C37 King's Gambit Accepted, Quaade Gambit McDonnell Gambit, or Muzio Gambit
King's Gambit Accepted: King's Knight's Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4
King's Gambit Accepted: Middleton Countergambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 d6 5. O-O Bg4 6. h3 h5 7. hxg4 hxg4
King's Gambit Accepted: Lolli Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Bxf7+
King's Gambit Accepted: Lolli Gambit, Young Variation: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Bxf7+ Kxf7 6. O-O gxf3 7. Qxf3 Qf6 8. d4 Qxd4+ 9. Be3 Qf6 10. Nc3
King's Gambit Accepted: Ghulam-Kassim Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. d4
King's Gambit Accepted: Kotov Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. d4 gxf3 6. Bxf4
King's Gambit Accepted: Ghulam-Kassim Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. d4 gxf3 6. Qxf3
King's Gambit Accepted: Australian Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. h4
King's Gambit Accepted: McDonnell Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Nc3
King's Gambit Accepted: Salvio Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Ne5
King's Gambit Accepted: Salvio Gambit, Cochrane Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Ne5 Qh4+ 6. Kf1 f3
King's Gambit Accepted: Salvio Gambit, Viennese Variation: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Ne5 Qh4+ 6. Kf1 Nc6
King's Gambit Accepted: Salvio Gambit, Santa Maria Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Ne5 Qh4+ 6. Kf1 Nf6
King's Gambit Accepted: Salvio Gambit, Silberschmidt Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Ne5 Qh4+ 6. Kf1 Nh6
King's Gambit Accepted: Salvio Gambit, Anderssen Counterattack: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Ne5 Qh4+ 6. Kf1 Nh6 7. d4 d6
King's Gambit Accepted: Silberschmidt Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. Ne5 Qh4+ 6. Kf1 Nh6 7. d4 f3
King's Gambit Accepted: Muzio Gambit, Wild Muzio Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O
King's Gambit Accepted: Muzio Gambit, Brentano Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O d5
King's Gambit Accepted: Muzio Gambit, Holloway Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Nc6
King's Gambit Accepted: Muzio Gambit Accepted, From's Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Qe7
King's Gambit Accepted: Muzio Gambit, Sarratt Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Qf6
King's Gambit Accepted: Double Muzio Gambit, Young Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Qf6 7. Bxf7+ Kxf7 8. d4 Qxd4+ 9. Be3 Qf6 10. Nc3 fxe3
King's Gambit Accepted: Double Muzio Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Qf6 7. e5 Qxe5 8. Bxf7+
King's Gambit Accepted: Double Muzio Gambit, Paulsen Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Qf6 7. e5 Qxe5 8. d3 Bh6 9. Nc3 Ne7 10. Bd2 Nbc6 11. Rae1
King's Gambit Accepted: Double Muzio Gambit, Bello Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Qf6 7. Nc3
King's Gambit Accepted: Double Muzio Gambit, Baldwin Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Qf6 7. Nc3 Qd4+ 8. Kh1 Qxc4 9. Nd5
King's Gambit Accepted: Muzio Gambit, Kling and Horwitz Counterattack: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O Qe7
King's Gambit Accepted: Rosentreter Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. d4
King's Gambit Accepted: Rosentreter Gambit, Testa Variation: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. d4 g4 5. Bxf4
King's Gambit Accepted: Rosentreter Gambit, Sörensen Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. d4 g4 5. Nc3
King's Gambit Accepted: Sörensen Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. d4 g4 5. Ne5
King's Gambit Accepted: Rosentreter Gambit, Bird Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. d4 g4 5. Ne5 Qh4+ 6. g3
King's Gambit Accepted: Quaade Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Nc3
King's Gambit Accepted: Blachly Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 Nc6 4. Bc4 g5

C38 King's Gambit Accepted
King's Gambit Accepted: Traditional Variation: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 Bg7
King's Gambit Accepted: Mayet Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 Bg7 5. d4 d6 6. c3
King's Gambit Accepted: Philidor Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 Bg7 5. h4
King's Gambit Accepted: Greco Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 Bg7 5. h4 h6 6. d4 d6 7. Nc3 c6 8. hxg5 hxg5 9. Rxh8 Bxh8 10. Ne5
King's Gambit Accepted: Hanstein Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 Bg7 5. O-O
King's Gambit Accepted: Philidor Gambit, Schultz Variation: 1. e4 e5 2. f4 exf4 3. Nf3 h6 4. Bc4 d6 5. d4 g5 6. h4 Bg7 7. Qd3

C39 King's Gambit Accepted, Allgaier and Kieseritzky Gambits including Rice Gambit
King's Gambit Accepted: King's Knight's Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4
King's Gambit Accepted: Kieseritzky Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5
King's Gambit Accepted: Kieseritzky, Polerio Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Be7
King's Gambit Accepted: Kieseritzky Gambit, Paulsen Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Bg7
King's Gambit Accepted: Kieseritzky Gambit, Brentano Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 d5
King's Gambit Accepted: Kieseritzky Gambit, Brentano Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 d5 6. d4 Nf6 7. Bxf4
King's Gambit Accepted: Kieseritzky Gambit, Brentano Defense, Caro Variation: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 d5 6. d4 Nf6 7. Bxf4 Nxe4 8. Nd2
King's Gambit Accepted: Kieseritzky Gambit, Kolisch Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 d6
King's Gambit Accepted: Kieseritzky Gambit, Long Whip: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 h5
King's Gambit Accepted: Kieseritzky, Long Whip Defense, Jaenisch Variation: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 h5 6. Bc4 Rh7 7. d4 Bh6 8. Nc3
King's Gambit Accepted: Kieseritzky Gambit, Neumann Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Nc6
King's Gambit Accepted: Kieseritzky Gambit, Berlin Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Nf6
King's Gambit Accepted: Kieseritzky Gambit, Anderssen Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Nf6 6. Bc4 d5 7. exd5 Bd6
King's Gambit Accepted: Kieseritzky Gambit, Anderssen-Cordel Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Nf6 6. Bc4 d5 7. exd5 Bd6 8. d4 Nh5 9. Bxf4 Nxf4
King's Gambit Accepted: Kieseritzky, Rice Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Nf6 6. Bc4 d5 7. exd5 Bd6 8. O-O
King's Gambit Accepted: Kieseritzky Gambit, Rice Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Nf6 6. Bc4 d5 7. exd5 Bd6 8. O-O Bxe5
King's Gambit Accepted: Kieseritzky Gambit, Paulsen Defense Deferred: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Nf6 6. Bc4 d5 7. exd5 Bg7
King's Gambit Accepted: Kieseritzky Gambit, Berlin Defense, Rubinstein Variation: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Nf6 6. d4
King's Gambit Accepted: Kieseritzky Gambit, Berlin Defense, de Riviere Variation: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Nf6 6. Nxg4 d5
King's Gambit Accepted: Kieseritzky Gambit, Rosenthal Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Qe7
King's Gambit Accepted: Kieseritzky, Salvio Defense, Cozio Variation: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ne5 Qe7 6. d4 f5 7. Bc4
King's Gambit Accepted: Allgaier Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5
King's Gambit Accepted: Kieseritzky Gambit, Cotter Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5 h6 6. Nxf7
King's Gambit Accepted: Allgaier Gambit, Urusov Attack: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5 h6 6. Nxf7 Kxf7 7. Bc4+
King's Gambit Accepted: Allgaier, Urusov Attack: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5 h6 6. Nxf7 Kxf7 7. Bc4+ d5 8. Bxd5+ Kg7 9. d4
King's Gambit Accepted: Allgaier Gambit, Thorold Attack: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5 h6 6. Nxf7 Kxf7 7. d4
King's Gambit Accepted: Allgaier, Cook Variation: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5 h6 6. Nxf7 Kxf7 7. d4 d5 8. Bxf4 dxe4 9. Bc4+ Kg7 10. Be5+
King's Gambit Accepted: Allgaier, Blackburne Gambit: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5 h6 6. Nxf7 Kxf7 7. Nc3
King's Gambit Accepted: Allgaier, Horny Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5 h6 6. Nxf7 Kxf7 7. Qxg4 Nf6 8. Qxf4 Bd6
King's Gambit Accepted: Allgaier, Schlechter Defense: 1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5 Nf6

C40 King's Knight Opening (includes Gunderam Defence, Brazilian Defence, Greco Defence, Damiano Defence, Elephant Gambit, and Latvian Gambit.)
King's Knight Opening: 1. e4 e5 2. Nf3
King's Pawn Game: Busch-Gass Gambit: 1. e4 e5 2. Nf3 Bc5
King's Pawn Game: Busch-Gass Gambit, Chiodini Gambit: 1. e4 e5 2. Nf3 Bc5 3. Nxe5 Nc6
King's Pawn Game: Gunderam Gambit: 1. e4 e5 2. Nf3 c6
Elephant Gambit: 1. e4 e5 2. Nf3 d5
Elephant Gambit: Maróczy Gambit: 1. e4 e5 2. Nf3 d5 3. exd5 Bd6
Elephant Gambit: Paulsen Countergambit: 1. e4 e5 2. Nf3 d5 3. exd5 e4
Elephant Gambit: Wasp Variation: 1. e4 e5 2. Nf3 d5 3. Nxe5 dxe4 4. Bc4 Qg5
Latvian Gambit: 1. e4 e5 2. Nf3 f5
Latvian Gambit: Senechaud Gambit: 1. e4 e5 2. Nf3 f5 3. b4
Latvian Gambit: Mayet Attack: 1. e4 e5 2. Nf3 f5 3. Bc4
Latvian Gambit: Mayet Attack, Strautins Gambit: 1. e4 e5 2. Nf3 f5 3. Bc4 b5
Latvian Gambit: Mayet Attack, Polerio-Svedenborg Variation: 1. e4 e5 2. Nf3 f5 3. Bc4 fxe4 4. Nxe5 d5
Latvian Gambit: Corkscrew Countergambit: 1. e4 e5 2. Nf3 f5 3. Bc4 fxe4 4. Nxe5 Nf6
Latvian Gambit: Mayet Attack, Poisoned Pawn Variation: 1. e4 e5 2. Nf3 f5 3. Bc4 fxe4 4. Nxe5 Qg5 5. d4 Qxg2
Latvian Gambit: Behting Variation: 1. e4 e5 2. Nf3 f5 3. Bc4 fxe4 4. Nxe5 Qg5 5. Nf7 Qxg2 6. Rf1 d5 7. Nxh8 Nf6
Latvian Gambit: Mayet Attack, Morgado Defense: 1. e4 e5 2. Nf3 f5 3. Bc4 Nf6
Latvian Gambit: Diepstraten Countergambit: 1. e4 e5 2. Nf3 f5 3. c4
Latvian Gambit: Mason Countergambit: 1. e4 e5 2. Nf3 f5 3. d4
Latvian Gambit Accepted: 1. e4 e5 2. Nf3 f5 3. exf5
Latvian Gambit Accepted: Ian Defense: 1.e4 e5 2. Nf3 f5 3. exf5 e4 4. Ne5 Nf6 5. Be2 Be7 6. Bh5+ Kf8
Latvian Gambit: Lobster Gambit: 1. e4 e5 2. Nf3 f5 3. g4
Latvian Gambit: Mlotkowski Variation: 1. e4 e5 2. Nf3 f5 3. Nc3
Latvian Gambit: Fraser Defense: 1. e4 e5 2. Nf3 f5 3. Nxe5 Nc6
Latvian Gambit: Corkscrew Gambit: 1. e4 e5 2. Nf3 f5 3. Nxe5 Nf6 4. Bc4 fxe4 5. Nf7 Qe7 6. Nxh8 d5
Latvian Gambit: Greco Variation: 1. e4 e5 2. Nf3 f5 3. Nxe5 Qe7
Latvian Gambit Accepted: Main Line: 1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. d4
Latvian Gambit Accepted: Bilguer Variation: 1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. d4 d6 5. Nc4
Latvian Gambit Accepted: Bronstein Attack: 1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. d4 d6 5. Nc4 fxe4 6. Be2
Latvian Gambit Accepted: Nimzowitsch Attack: 1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. d4 d6 5. Nc4 fxe4 6. Ne3
Latvian Gambit Accepted: Bronstein Gambit: 1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. d4 d6 5. Nc4 fxe4 6. Qh5+ g6 7. Qe2
Latvian Gambit Accepted: Foltys-Leonhardt Variation: 1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4
Latvian Gambit Accepted: Foltys Variation: 1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 fxe4 5. d3
Latvian Gambit Accepted: Leonhardt Variation: 1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. Nc4 fxe4 5. Nc3
King's Pawn Game: Damiano Defense: 1. e4 e5 2. Nf3 f6
King's Pawn Game: Damiano Defense, Damiano Gambit: 1. e4 e5 2. Nf3 f6 3. Nxe5 fxe5 4. Qh5+ g6 5. Qxe5+ Qe7 6. Qxh8
King's Pawn Game: Damiano Defense, Damiano Gambit, Chigorin Gambit: 1. e4 e5 2. Nf3 f6 3. Nxe5 Qe7 4. Nf3 d5
Gunderam Defense: 1. e4 e5 2. Nf3 Qe7
King's Pawn Game: Gunderam Defense, Gunderam Gambit: 1. e4 e5 2. Nf3 Qe7 3. Bc4 f5
King's Pawn Game: McConnell Defense: 1. e4 e5 2. Nf3 Qf6
King's Pawn Game: La Bourdonnais Gambit: 1. e4 e5 2. Nf3 Qf6 3. Bc4 Qg6 4. O-O

C41 Philidor Defence
Philidor Defense: Lion Variation, Sozin Variation: 1. e4 d6 2. d4 Nf6 3. Nc3 e5 4. Nf3 Nbd7 5. Bc4 Be7 6. O-O O-O 7. Qe2 c6 8. a4 exd4
Philidor Defense: Lion Variation, Delayed Bishop Sacrifice: 1. e4 d6 2. d4 Nf6 3. Nc3 Nbd7 4. Nf3 e5 5. Bc4 Be7 6. dxe5 dxe5 7. Bxf7+
Philidor Defense: 1. e4 e5 2. Nf3 d6
Philidor Defense: 1. e4 e5 2. Nf3 d6 3. Bc4
Philidor Defense: 1. e4 e5 2. Nf3 d6 3. Bc4 Be7
Philidor Defense: Steinitz Variation: 1. e4 e5 2. Nf3 d6 3. Bc4 Be7 4. c3
Philidor Defense: Lopez Countergambit: 1. e4 e5 2. Nf3 d6 3. Bc4 f5
Philidor Defense: 1. e4 e5 2. Nf3 d6 3. d4
Philidor Defense: Philidor Gambit: 1. e4 e5 2. Nf3 d6 3. d4 Bd7
Philidor Defense: Albin-Blackburne Gambit: 1. e4 e5 2. Nf3 d6 3. d4 Bg4 4. dxe5 Nd7
Philidor Defense: Exchange Variation: 1. e4 e5 2. Nf3 d6 3. d4 exd4
Philidor Defense: Morphy Gambit: 1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Bc4
Philidor Defense: Bird Gambit: 1. e4 e5 2. Nf3 d6 3. d4 exd4 4. c3
Philidor Defense: Exchange Variation: 1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4
Philidor Defense: Paulsen Attack: 1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4 d5 5. exd5
Philidor Defense: Larsen Variation: 1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4 g6
Philidor Defense: Exchange Variation: 1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4 Nf6
Philidor Defense: Berger Variation: 1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4 Nf6 5. Nc3 Be7 6. Be2 O-O 7. O-O c5 8. Nf3 Nc6 9. Bg5 Be6 10. Re1
Philidor Defense: Boden Variation: 1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Qxd4 Bd7
Philidor Defense: Philidor Countergambit: 1. e4 e5 2. Nf3 d6 3. d4 f5
Philidor Defense: Lopez Countergambit, Jaenisch Variation: 1. e4 e5 2. Nf3 d6 3. d4 f5 4. Bc4 exd4 5. Ng5 Nh6 6. Nxh7
Philidor Defense: Philidor Countergambit, del Rio Attack: 1. e4 e5 2. Nf3 d6 3. d4 f5 4. dxe5 fxe4 5. Ng5 d5 6. e6
Philidor Defense: Philidor Countergambit, Berger Variation: 1. e4 e5 2. Nf3 d6 3. d4 f5 4. dxe5 fxe4 5. Ng5 d5 6. e6 Bc5 7. Nc3
Philidor Defense: Philidor Countergambit, Zukertort Variation: 1. e4 e5 2. Nf3 d6 3. d4 f5 4. Nc3
Philidor Defense: Hanham Variation: 1. e4 e5 2. Nf3 d6 3. d4 Nd7
Philidor Defense: Hanham Variation, Delmar Variation: 1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. Bc4 c6 5. c3
Philidor Defense: Hanham Variation, Schlechter Variation: 1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. Bc4 c6 5. Nc3
Philidor Defense: Hanham, Kmoch Variation: 1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. Bc4 c6 5. Ng5
Philidor Defense: Hanham Variation, Krause Variation: 1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. Bc4 c6 5. O-O
Philidor Defense: Hanham Variation, Steiner Variation: 1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. Bc4 c6 5. O-O Be7 6. dxe5
Philidor Defense: Hanham Variation, Sharp Variation: 1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. Bc4 Nb6
Philidor Defense: Lion Variation, Shirov Gambit: 1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. Nc3 Ngf6 5. g4
Philidor Defense: Nimzowitsch Variation: 1. e4 e5 2. Nf3 d6 3. d4 Nf6
Philidor Defense: Nimzowitsch Variation, Klein Variation: 1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. Bc4
Philidor Defense: Nimzowitsch Variation: 1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. dxe5
Philidor Defense: Nimzowitsch Variation, Sokolsky Variation: 1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. dxe5 Nxe4 5. Nbd2
Philidor Defense: Nimzowitsch Variation, Rellstab Variation: 1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. dxe5 Nxe4 5. Qd5
Philidor Defense: Lion Variation: 1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. Nc3 Nbd7
Philidor Defense: Lion Variation, Bishop Sacrifice: 1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. Nc3 Nbd7 5. Bc4 Be7 6. Bxf7+
Philidor Defense: Nimzowitsch, Larobok Variation: 1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. Nc3 Nbd7 5. Bc4 Be7 6. Ng5 O-O 7. Bxf7+
Philidor Defense: Lion Variation, Forcing Line: 1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. Nc3 Nbd7 5. Bc4 Be7 6. Ng5 O-O 7. Bxf7+ Rxf7 8. Ne6
Philidor Defense: Lion Variation, Lion's Claw, with Bc4 and h6: 1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. Nc3 Nbd7 5. Bc4 Be7 6. O-O h6
Philidor Defense: Lion Variation, Lion's Claw, with Be2 and c6: 1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. Nc3 Nbd7 5. Be2 Be7 6. O-O c6
Philidor Defense: Nimzowitsch, Locock Variation: 1. e4 e5 2. Nf3 d6 3. d4 Nf6 4. Ng5

C42 Petrov's Defence, including Marshall Trap
Petrov's Defense: 1. e4 e5 2. Nf3 Nf6
Petrov's Defense: Italian Variation: 1. e4 e5 2. Nf3 Nf6 3. Bc4
Petrov's Defense: Three Knights Game: 1. e4 e5 2. Nf3 Nf6 3. Nc3
Petrov's Defense: 1. e4 e5 2. Nf3 Nf6 3. Nxe5
Petrov's Defense: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6
Petrov's Defense: Paulsen Attack: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nc4
Petrov's Defense: Karklins-Martinovsky Variation: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nd3
Petrov's Defense: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3
Petrov's Defense: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4
Petrov's Defense: Millennium Attack: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Bd3
Petrov's Defense: Kaufmann Attack: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. c4
Petrov's Defense: French Attack: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d3
Petrov's Defense: Classical Attack: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4
Petrov's Defense: Classical Attack, Marshall Variation: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6
Petrov's Defense: Classical Attack, Tarrasch Variation: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 7. O-O O-O 8. c4 Bg4
Petrov's Defense: Classical Attack, Marshall Trap: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 7. O-O O-O 8. c4 Bg4 9. cxd5 f5 10. Re1 Bxh2+
Petrov's Defense: Classical Attack, Staunton Variation: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 7. O-O O-O 8. c4 c6
Petrov's Defense: Classical Attack, Marshall Variation, Chinese Gambit: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6 7. O-O O-O 8. c4 c6 9. Re1 Bg4
Petrov's Defense: Classical Attack, Chigorin Variation: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 8. Re1
Petrov's Defense: Classical Attack, Maróczy Variation: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 8. Re1 Bg4 9. c3 f5 10. c4 Bh4
Petrov's Defense: Classical Attack, Berger Variation: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 8. Re1 Bg4 9. c3 f5 10. Nbd2
Petrov's Defense: Classical Attack, Mason Variation: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O O-O
Petrov's Defense: Classical Attack, Mason-Showalter Variation: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6
Petrov's Defense: Classical Attack, Jaenisch Variation: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. c4
Petrov's Defense: Classical Attack, Chigorin Variation, Main Line: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. c4 Nb4 9. Be2
Petrov's Defense: Classical Attack, Chigorin Variation, Browne Attack: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. c4 Nb4 9. cxd5
Petrov's Defense: Classical Attack, Krause Variation: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. Re1 Bg4 9. c3 f5 10. c4
Petrov's Defense: Classical Attack, Closed Variation: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 Nf6
Petrov's Defense: Nimzowitsch Attack: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Nc3
Petrov's Defense: Cozio Attack: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Qe2
Petrov's Defense: Cochrane Gambit: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nxf7
Petrov's Defense: Cochrane Gambit, Bishop Check Line: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nxf7 Kxf7 5. Bc4+
Petrov's Defense: Cochrane Gambit, Center Variation: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nxf7 Kxf7 5. d4
Petrov's Defense: Stafford Gambit: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nc6
Petrov's Defense: Stafford Gambit: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nc6 4. Nxc6 dxc6
Petrov's Defense: Damiano Variation: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nxe4
Petrov's Defense: Damiano Variation, Kholmov Gambit: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nxe4 4. Qe2 Qe7
Petrov's Defense: Moody Gambit: 1. e4 e5 2. Nf3 Nf6 3. Qe2 Nc6 4. d4

C43 Petrov's Defence, Modern (Steinitz) Attack
Bishop's Opening: Urusov Gambit: 1. e4 e5 2. Bc4 Nf6 3. d4 exd4 4. Nf3
Bishop's Opening: Urusov Gambit, Keidansky Gambit: 1. e4 e5 2. Bc4 Nf6 3. d4 exd4 4. Nf3 Nxe4 5. Qxd4
Petrov's Defense: Modern Attack: 1. e4 e5 2. Nf3 Nf6 3. d4
Petrov's Defense: Modern Attack, Symmetrical Variation: 1. e4 e5 2. Nf3 Nf6 3. d4 d5
Petrov's Defense: Modern Attack: 1. e4 e5 2. Nf3 Nf6 3. d4 exd4
Petrov's Defense: Modern Attack, Tal Gambit: 1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Bb5
Petrov's Defense: Modern Attack, Steinitz Variation: 1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Qe2
Petrov's Defense: Modern Attack, Bardeleben Variation: 1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Qe2 Nc5 6. Nxd4 Nc6
Petrov's Defense: Modern Attack, Center Attack: 1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Qxd4
Petrov's Defense: Modern Attack, Center Variation: 1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 4. Bd3
Petrov's Defense: Modern Attack, Trifunovic Variation: 1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 4. Bd3 d5 5. Nxe5 Bd6 6. O-O O-O 7. c4 Bxe5
Petrov's Defense: Modern Attack, Murrey Variation: 1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 4. Bd3 Nc6

C44 King's Pawn Game (includes Ponziani Opening, Inverted Hungarian Opening, Irish Gambit, Konstantinopolsky Opening and some Scotch Game)
King's Knight Opening: Normal Variation: 1. e4 e5 2. Nf3 Nc6
King's Pawn Game: Pachman Wing Gambit: 1. e4 e5 2. Nf3 Nc6 3. b4
Scotch Game: Benima Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Be7 4. d4 exd4
Scotch Game: Scotch Gambit, Dubois Réti Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4
Scotch Game: Scotch Gambit, Kingside Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. e5 Ng4
King's Pawn Game: Tayler Opening: 1. e4 e5 2. Nf3 Nc6 3. Be2
King's Pawn Game: Tayler Opening, Inverted Hanham: 1. e4 e5 2. Nf3 Nc6 3. Be2 Nf6 4. d3 d5 5. Nbd2
King's Pawn Game: Tayler Opening: 1. e4 e5 2. Nf3 Nc6 3. Be2 Nf6 4. d4
King's Pawn Game: Tayler Opening, Basman Gambit: 1. e4 e5 2. Nf3 Nc6 3. Be2 Nf6 4. d4 exd4 5. e5
Ponziani Opening: 1. e4 e5 2. Nf3 Nc6 3. c3
Ponziani Opening: Romanishin Variation: 1. e4 e5 2. Nf3 Nc6 3. c3 Be7
Ponziani Opening: Spanish Variation: 1. e4 e5 2. Nf3 Nc6 3. c3 d5 4. Bb5
Ponziani Opening: Spanish Variation, Harrwitz Attack, Nikitin Gambit: 1. e4 e5 2. Nf3 Nc6 3. c3 d5 4. Bb5 dxe4 5. Nxe5 Qd5 6. Qa4
Ponziani Opening: Caro Gambit: 1. e4 e5 2. Nf3 Nc6 3. c3 d5 4. Qa4 Bd7
Ponziani Opening: Steinitz Variation: 1. e4 e5 2. Nf3 Nc6 3. c3 d5 4. Qa4 f6
Ponziani Opening: Leonhardt Variation: 1. e4 e5 2. Nf3 Nc6 3. c3 d5 4. Qa4 Nf6
Ponziani Opening: Ponziani Countergambit: 1. e4 e5 2. Nf3 Nc6 3. c3 f5
Ponziani Opening: Ponziani Countergambit, Schmidt Attack: 1. e4 e5 2. Nf3 Nc6 3. c3 f5 4. d4 d6 5. d5
Ponziani Opening: Jaenisch Counterattack: 1. e4 e5 2. Nf3 Nc6 3. c3 Nf6
Ponziani Opening: Neumann Gambit: 1. e4 e5 2. Nf3 Nc6 3. c3 Nf6 4. Bc4
Ponziani Opening: Jaenisch Counterattack: 1. e4 e5 2. Nf3 Nc6 3. c3 Nf6 4. d3
Ponziani Opening: Jaenisch Counterattack: 1. e4 e5 2. Nf3 Nc6 3. c3 Nf6 4. d3 d5
Ponziani Opening: Jaenisch Counterattack: 1. e4 e5 2. Nf3 Nc6 3. c3 Nf6 4. d3 d5 5. Nbd2
Ponziani Opening: Vukovic Gambit: 1. e4 e5 2. Nf3 Nc6 3. c3 Nf6 4. d4 Nxe4 5. d5 Bc5
Ponziani Opening: Réti Variation: 1. e4 e5 2. Nf3 Nc6 3. c3 Nge7
King's Pawn Game: Dresden Opening: 1. e4 e5 2. Nf3 Nc6 3. c4
Dresden Opening: The Goblin: 1. e4 e5 2. Nf3 Nc6 3. c4 Nf6 4. Nxe5
Latvian Gambit: Clam Gambit: 1. e4 e5 2. Nf3 Nc6 3. d3 f5 4. exf5
Scotch Game: 1. e4 e5 2. Nf3 Nc6 3. d4
Scotch Game: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4
Scotch Game: Relfsson Gambit: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bb5
Scotch Game: Scotch Gambit: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4
Scotch Game: Scotch Gambit, London Defense: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bb4+
Scotch Game: Cochrane Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bb4+ 5. c3 dxc3 6. bxc3 Ba5 7. e5
Scotch Game: Hanneken Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bb4+ 5. c3 dxc3 6. O-O cxb2 7. Bxb2 Nf6 8. Ng5 O-O 9. e5 Nxe5
Scotch Game: Haxo Gambit: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bc5
Scotch Game: Scotch Gambit, Sarratt Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bc5 5. Ng5
Scotch Game: Cochrane-Shumov Defense: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bc5 5. Ng5 Nh6 6. Nxf7 Nxf7 7. Bxf7+ Kxf7 8. Qh5+ g6 9. Qxc5 d5
Scotch Game: Vitzthum Attack: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bc5 5. Ng5 Nh6 6. Qh5
Scotch Game: Scotch Gambit, Cochrane-Anderssen Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bc5 5. O-O d6 6. c3 Bg4
Scotch Game: Scotch Gambit, Advance Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. e5
Scotch Game: Göring Gambit: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. c3
Scotch Game: Scotch Gambit, Göring Gambit Declined: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. c3 d5
Scotch Game: Göring Gambit, Double Pawn Sacrifice: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. c3 dxc3 5. Bc4
Scotch Game: Göring Gambit, Bardeleben Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. c3 dxc3 5. Bc4 Nf6 6. Nxc3 Bb4
Scotch Game: Göring Gambit, Main Line: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. c3 dxc3 5. Nxc3 Bb4
Scotch Game: Sea-Cadet Mate: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. c3 dxc3 5. Nxc3 d6 6. Bc4 Bg4 7. O-O Ne5 8. Nxe5 Bxd1 9. Bxf7+ Ke7 10. Nd5#
Scotch Game: Lolli Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 Nxd4
Scotch Game: Napoleon Gambit: 1. e4 e5 2. Nf3 Nc6 3. d4 Nxd4 4. Nxd4 exd4 5. Bc4
Scotch Game: Lolli Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 Nxd4 4. Nxd4 exd4 5. Qxd4
King's Knight Opening: Konstantinopolsky: 1. e4 e5 2. Nf3 Nc6 3. g3
Irish Gambit: 1. e4 e5 2. Nf3 Nc6 3. Nxe5
King's Pawn Game: Schulze-Müller Gambit: 1. e4 e5 2. Nf3 Nc6 3. Nxe5 Nxe5 4. d4

C45 Scotch Game
Scotch Game: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4
Scotch Game: Malaniuk Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bb4+
Scotch Game: Classical Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5
Scotch Game: Paulsen Attack: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. c3 Nge7 7. Bb5
Scotch Game: Paulsen, Gunsberg Defense: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. c3 Nge7 7. Bb5 Nd8
Scotch Game: Meitner Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. c3 Nge7 7. Nc2
Scotch Game: Classical Variation, Blackburne Attack: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. c3 Nge7 7. Qd2
Scotch Game: Gottschall Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. c3 Nge7 7. Qd2 d5 8. Nb5 Bxe3 9. Qxe3 O-O 10. Nxc7 Rb8 11. Nxd5 Nxd5 12. exd5 Nb4
Scotch Game: Classical Variation, Millennium Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. c3 Qg6
Scotch Game: Blumenfeld Attack: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Be3 Qf6 6. Nb5
Scotch Game: Potter Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Nb3
Scotch Game: Romanishin Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Nb3 Bb4+
Scotch Game: Classical Variation, Intermezzo Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Nxc6 Qf6
Scotch Game: Schmidt Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6
Scotch Game: Alekhine Gambit: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 5. e5
Scotch Game: Mieses Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 5. Nxc6 bxc6 6. e5
Scotch Game: Tartakower Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 5. Nxc6 bxc6 6. Nd2
Scotch Game: Ghulam-Kassim Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nxd4 5. Qxd4 d6 6. Bd3
Scotch Game: Steinitz Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4
Scotch Game: Braune Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 5. Be3
Scotch Game: Horwitz Attack: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 5. Nb5
Scotch Game: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 5. Nb5 Bb4+ 6. Bd2
Scotch Game: Rosenthal Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 5. Nb5 Bb4+ 6. Bd2 Qxe4+ 7. Be2 Kd8 8. O-O Bxd2 9. Nxd2 Qg6
Scotch Game: Horwitz Attack, Blackburne Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 5. Nb5 Bb4+ 6. Bd2 Qxe4+ 7. Be2 Kd8 8. O-O Bxd2 9. Qxd2
Scotch Game: Steinitz Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 5. Nc3
Scotch Game: Modern Defense: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 5. Nc3 Bb4
Scotch Game: Fraser Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 5. Nf3
Scotch Game: Paulsen Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4 5. Nf5

C46 Three Knights Game including Halloween Gambit
Three Knights Opening: 1. e4 e5 2. Nf3 Nc6 3. Nc3
Three Knights Opening: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Bb4
Three Knights Opening: Schlechter Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Bb4 4. Nd5 Nf6
Three Knights Opening: Winawer Defense: 1. e4 e5 2. Nf3 Nc6 3. Nc3 f5
Three Knights Opening: Steinitz Defense: 1. e4 e5 2. Nf3 Nc6 3. Nc3 g6
Three Knights Opening: Steinitz-Rosenthal Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 g6 4. d4 exd4 5. Nd5

C47 Four Knights Game
Four Knights Game: Italian Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Nc3
Four Knights Game: Italian Variation, Noa Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Nc3 Nxe4 5. Bxf7+
Four Knights Game: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6
Four Knights Game: Gunsberg Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. a3
Four Knights Game: Scotch Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4
Four Knights Game: Scotch Variation, Oxford Gambit: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 Bb4 5. d5 Nd4
Four Knights Game: Scotch Variation, Krause Gambit: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 Bb4 5. Nxe5
Four Knights Game: Scotch Variation, Krause Gambit, Leonhardt Defense: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 Bb4 5. Nxe5 Qe7
Four Knights Game: Scotch Variation Accepted: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 exd4
Four Knights Game: Scotch Variation, Belgrade Gambit: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 exd4 5. Nd5
Four Knights Game: Scotch Variation, Belgrade Gambit, Modern Defense: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 exd4 5. Nd5 Nxe4 6. Qe2 f5
Four Knights Game: Scotch Variation, Schmid Defense: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 exd4 5. Nxd4 Nxe4
Four Knights Game: Halloween Gambit: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Nxe5
Four Knights Game: Halloween Gambit, Plasma Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Nxe5 Nxe5 5. d4 Nc6 6. d5 Ne5 7. f4 Ng6 8. e5 Ng8 9. d6 cxd6 10. exd6 Qf6 11. Nb5 Rb8
Four Knights Game: Halloween Gambit, Oldtimer Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Nxe5 Nxe5 5. d4 Ng6 6. e5 Ng8 7. Bc4 Bb4 8. Qf3 f5

C48 Four Knights Game, Spanish Variation
Four Knights Game: Spanish Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5
Four Knights Game: Spanish Variation, Ranken Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 a6 5. Bxc6
Four Knights Game: Spanish Variation, Spielmann Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 a6 5. Bxc6 dxc6 6. Nxe5 Nxe4 7. Nxe4 Qd4 8. O-O Qxe5 9. Re1 Be6 10. d4 Qd5
Four Knights Game: Spanish Variation, Classical Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bc5
Four Knights Game: Spanish Variation, Bardeleben Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bc5 5. O-O O-O 6. Nxe5 Nxe5 7. d4 Bd6 8. f4 Nc6 9. e5 Bb4
Four Knights Game: Spanish Variation, Rubinstein Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4
Four Knights Game: Spanish Variation, Rubinstein Variation, Marshall Gambit: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4 5. Ba4 Bc5 6. Nxe5 O-O
Four Knights Game: Spanish Variation, Rubinstein Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4 5. Be2
Four Knights Game: Spanish Variation, Rubinstein Variation, Maróczy Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4 5. Be2 Nxf3+ 6. Bxf3 Bc5 7. O-O O-O 8. d3 d6 9. Na4 Bb6
Four Knights Game: Spanish Variation, Rubinstein Variation Accepted: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4 5. Nxd4
Four Knights Game: Spanish Variation, Rubinstein Variation, Marshall Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4 5. Nxe5 Bc5 6. O-O O-O
Four Knights Game: Spanish Variation, Rubinstein Variation: 1. e4 e5 2. Nf3 Nf6 3. Nc3 Nc6 4. Bb5 Nd4 5. Nxe5 Qe7 6. f4
Four Knights Game: Spanish Variation, Rubinstein Variation, Henneberger Variation: 1. e4 e5 2. Nf3 Nf6 3. Nc3 Nc6 4. Bb5 Nd4 5. O-O

C49 Four Knights Game, Double Ruy Lopez
Four Knights Game: Spanish Variation, Double Spanish: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4
Four Knights Game: Spanish Variation, Nimzowitsch Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. Bxc6
Four Knights Game: Spanish Variation, Double Spanish: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3
Four Knights Game: Spanish Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3
Four Knights Game: Spanish Variation, Svenonius Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d5
Four Knights Game: Spanish Variation, Janowski Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Bxc3 7. bxc3 d6 8. Re1
Four Knights Game: Spanish Variation, Symmetrical Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6
Four Knights Game: Spanish Variation, Symmetrical Variation, Metger Unpin: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7
Four Knights Game: Spanish Variation, Symmetrical Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Bxc3 8. bxc3 Qe7 9. Re1 Nd8 10. d4 Bg4
Four Knights Game: Spanish Variation, Symmetrical Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Ne7
Four Knights Game: Spanish Variation, Symmetrical Variation, Blake Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Ne7 8. Nh4 c6 9. Bc4 d5 10. Bb3 Qd6
Four Knights Game: Spanish Variation, Symmetrical Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Ne2
Four Knights Game: Spanish Variation, Alatortsev Variation: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 Qe7 7. Ne2 d5
Four Knights Game: Spanish Variation, Symmetrical Variation, Tarrasch Variation: 1. e4 e5 2. Nf3 Nf6 3. Nc3 Nc6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6 7. Bg5 Be6
Four Knights Game: Spanish Variation, Gunsberg Counterattack: 1. e4 e5 2. Nf3 Nf6 3. Nc3 Nc6 4. Bb5 Bb4 5. O-O O-O 6. Nd5 Nxd5 7. exd5 e4

C50 Italian Game (includes Blackburne Shilling Gambit, Hungarian Defence, Semi-Italian Opening, Italian Gambit, Légal Trap, Rousseau Gambit, Koltanowski Gambit and Giuoco Pianissimo)
Italian Game: 1. e4 e5 2. Nf3 Nc6 3. Bc4
Italian Game: Giuoco Piano: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5
Italian Game: Jerome Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. Bxf7+
Italian Game: Giuoco Pianissimo: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3
Italian Game: Giuoco Pianissimo, Lucchini Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 f5
Italian Game: Giuoco Pianissimo, Dubois Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 f5 5. Ng5 f4
Italian Game: Giuoco Pianissimo, Italian Four Knights Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 Nf6 5. Nc3
Italian Game: Giuoco Pianissimo, Canal Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 Nf6 5. Nc3 d6 6. Bg5
Italian Game: Rosentreter Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d4
Four Knights Game: Italian Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. Nc3 Nf6
Italian Game: Classical Variation, Albin Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. O-O Nf6 5. c3
Italian Game: Deutz Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. O-O Nf6 5. d4
Italian Game: Hungarian Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Be7
Italian Game: Hungarian Defense, Tartakower Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Be7 4. d4 exd4 5. c3 Nf6 6. e5 Ne4
Italian Game: Paris Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 d6
Italian Game: Rousseau Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 f5
Italian Game: Anti-Fried Liver Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 h6
Italian Game: Blackburne-Kostić Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nd4
Italian Game: Giuoco Pianissimo, Normal: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3 Bc5
Italian Game: Giuoco Pianissimo: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. O-O Bc5 5. Nc3 d6 6. d3

C51 Evans Gambit
Italian Game: Evans Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4
Italian Game: Evans Gambit, Fontaine Countergambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 b5
Italian Game: Evans Gambit Declined: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6
Italian Game: Evans Gambit Declined: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6 5. a4
Italian Game: Evans Gambit Declined, Showalter Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6 5. a4 a6 6. Nc3
Italian Game: Evans Gambit Declined, Lange Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6 5. b5 Na5 6. Nxe5 Nh6
Italian Game: Evans Gambit Declined, Pavlov Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6 5. b5 Na5 6. Nxe5 Nh6 7. d4 d6 8. Bxh6 dxe5 9. Bxg7 Rg8 10. Bxf7+ Kxf7 11. Bxe5 Qg5 12. Nd2
Italian Game: Evans Gambit Declined, Hirschbach Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6 5. b5 Na5 6. Nxe5 Qg5
Italian Game: Evans Gambit Declined, Vasquez Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6 5. b5 Na5 6. Nxe5 Qg5 7. Bxf7+ Ke7 8. Qh5
Italian Game: Evans Gambit Declined, Hicken Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6 5. b5 Na5 6. Nxe5 Qg5 7. Qf3 Qxe5 8. Qxf7+ Kd8 9. Bb2
Italian Game: Evans Gambit Declined, Cordel Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bb6 5. Bb2
Italian Game: Evans Gambit Accepted: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4
Italian Game: Evans Gambit, Morphy Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 exd4 7. O-O d6 8. cxd4 Bb6 9. Nc3
Italian Game: Evans Gambit, McDonnell Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5
Italian Game: Evans Gambit, Harding Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. cxd4 Bb4+ 8. Bd2
Italian Game: Evans Gambit, McDonnell Defense, Main Line: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. cxd4 Bb6
Italian Game: Evans Gambit, Ulvestad Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. cxd4 Bb6 9. d5 Na5 10. Bb2
Italian Game: Evans Gambit, Paulsen Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. cxd4 Bb6 9. d5 Na5 10. Bb2 Ne7
Italian Game: Evans Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. cxd4 Bb6 9. Nc3 Bg4
Italian Game: Evans Gambit, Fraser Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. cxd4 Bb6 9. Nc3 Bg4 10. Qa4
Italian Game: Evans Gambit, Fraser-Mortimer Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. cxd4 Bb6 9. Nc3 Bg4 10. Qa4 Bd7 11. Qb3 Na5 12. Bxf7+ Kf8 13. Qc2
Italian Game: Evans Gambit, Mortimer-Evans Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. cxd4 Bb6 9. Nc3 Bg4 10. Qa4 Bd7 11. Qb3 Na5 12. Bxf7+ Kf8 13. Qc2 Kxf7
Italian Game: Evans Gambit, Göring Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. cxd4 Bb6 9. Nc3 Na5 10. Bg5
Italian Game: Evans Gambit, Steinitz Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. d4 exd4 7. O-O d6 8. cxd4 Bb6 9. Nc3 Na5 10. Bg5 f6 11. Be3
Italian Game: Evans Gambit, Stone-Ware Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bd6
Italian Game: Evans Gambit, Anderssen Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Be7
Italian Game: Evans Gambit, Anderssen Variation, Cordel Line: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Be7 6. d4 Na5
Italian Game: Evans Gambit, Mayet Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bf8
Italian Game: Evans Gambit, Hein Countergambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 d5

C52 Evans Gambit with 4...Bxb4 5.c3 Ba5
Italian Game: Evans Gambit, Main Line: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5
Italian Game: Evans Gambit, Leonhardt Countergambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 b5
Italian Game: Evans Gambit, Bronstein Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 d6
Italian Game: Evans Gambit, Sokolsky Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 d6 7. Bg5
Italian Game: Evans Gambit, Tartakower Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 d6 7. Qb3
Italian Game: Evans Gambit, Levenfish Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 d6 7. Qb3 Qd7 8. dxe5 dxe5 9. O-O Bb6 10. Ba3 Na5 11. Nxe5
Italian Game: Evans Gambit, Pierce Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 exd4
Italian Game: Evans Gambit, Johner Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 exd4 7. O-O b5
Italian Game: Evans Gambit, Dufresne Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 exd4 7. O-O d3
Italian Game: Evans Gambit, Waller Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 exd4 7. O-O d6 8. Qb3
Italian Game: Evans Gambit, Compromised Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 exd4 7. O-O dxc3
Italian Game: Evans Gambit, Compromised Defense, Main Line: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 exd4 7. O-O dxc3 8. Qb3 Qf6 9. e5 Qg6 10. Nxc3 Nge7 11. Ba3
Italian Game: Evans Gambit, Compromised Defense, Potter Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 exd4 7. O-O dxc3 8. Qb3 Qf6 9. e5 Qg6 10. Nxc3 Nge7 11. Rd1
Italian Game: Evans Gambit, Mieses Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 exd4 7. O-O Nge7
Italian Game: Evans Gambit, Laroche Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 Nf6
Italian Game: Evans Gambit, Slow Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. O-O
Italian Game: Evans Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. O-O d6
Italian Game: Evans Gambit, Lasker Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. O-O d6 7. d4 Bb6
Italian Game: Evans Gambit, Sanders-Alapin Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. O-O d6 7. d4 Bd7
Italian Game: Evans Gambit, Alapin-Steinitz Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. O-O d6 7. d4 Bg4
Italian Game: Evans Gambit, Anderssen Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. O-O Nf6 7. d4 exd4
Italian Game: Evans Gambit, Richardson Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. O-O Nf6 7. d4 O-O 8. Nxe5

C53 Giuoco Piano
Italian Game: Classical Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3
Italian Game: Classical Variation, La Bourdonnais Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 d6 5. d4 exd4 6. cxd4 Bb6
Italian Game: Bird's Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. b4
Italian Game: Classical Variation, Closed Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Qe7
Italian Game: Classical Variation, Center Holding Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Qe7 5. d4 Bb6
Italian Game: Classical Variation, Mestel Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Qe7 5. d4 Bb6 6. Bg5
Italian Game: Classical Variation, Eisinger Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Qe7 5. d4 Bb6 6. d5 Nb8 7. d6
Italian Game: Classical Variation, Tarrasch Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Qe7 5. d4 Bb6 6. O-O d6 7. a4 a6 8. h3 Nf6 9. Re1

C54 Giuoco Piano
Italian Game: Classical Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6
Italian Game: Classical Variation, Giuoco Pianissimo: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d3
Italian Game: Classical Variation, Giuoco Pianissimo, with a6: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d3 a6
Italian Game: Classical Variation, Giuoco Pianissimo, with d6: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d3 d6
Italian Game: Classical Variation, Giuoco Pianissimo, Albin Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d3 d6 6. b4
Italian Game: Classical Variation, Giuoco Pianissimo, with a6: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d3 d6 6. Nbd2 a6
Italian Game: Classical Variation, Giuoco Pianissimo: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d3 d6 6. Nbd2 O-O 7. O-O
Italian Game: Classical Variation, Giuoco Pianissimo: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d3 d6 6. O-O O-O
Italian Game: Classical Variation, Giuoco Pianissimo, Main Line: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d3 d6 6. O-O O-O 7. Re1 a6 8. Bb3 Ba7 9. h3
Italian Game: Classical Variation, Center Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4
Italian Game: Classical Variation, Greco Gambit, Traditional Line: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4
Italian Game: Giuoco Piano, Krause Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Bd2 Nxe4 8. Bxb4 Nxb4 9. Bxf7+ Kxf7 10. Qb3+ d5 11. Ne5+ Kf6 12. f3
Italian Game: Giuoco Piano, Cracow Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Kf1
Italian Game: Giuoco Piano, Greco's Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3
Italian Game: Classical Variation, Greco Gambit, Main Line: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 Nxe4 8. O-O Bxc3
Italian Game: Giuoco Piano, Steinitz Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 Nxe4 8. O-O Bxc3 9. bxc3 d5 10. Ba3
Italian Game: Classical Variation, Greco Gambit, Moeller-Therkatz Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 Nxe4 8. O-O Bxc3 9. d5
Italian Game: Giuoco Piano, Therkatz-Herzog Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 Nxe4 8. O-O Bxc3 9. d5 Bf6 10. Re1 Ne7 11. Rxe4 d6 12. Bg5 Bxg5 13. Nxg5 O-O 14. Nxh7
Italian Game: Classical Variation, Greco Gambit, Moeller-Bayonet Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 Nxe4 8. O-O Bxc3 9. d5 Bf6 10. Re1 Ne7 11. Rxe4 d6 12. g4
Italian Game: Classical Variation, Greco Gambit, Greco Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 Nxe4 8. O-O Nxc3
Italian Game: Giuoco Piano, Aitken Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 Nxe4 8. O-O Nxc3 9. bxc3 Bxc3 10. Ba3
Italian Game: Giuoco Piano, Bernstein Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. cxd4 Bb4+ 7. Nc3 Nxe4 8. O-O Nxc3 9. bxc3 Bxc3 10. Qb3 d5
Italian Game: Classical Variation, Greco Gambit, Anderssen Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. e5 d5 7. Bb5 Ne4 8. cxd4 Bb4+
Italian Game: Classical Variation, Ghulam-Kassim Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. e5 Ne4 7. Bd5 Nxf2 8. Kxf2 dxc3+ 9. Kg3
Italian Game: Classical Variation, Giuoco Pianissimo, with a5: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. O-O Nf6 5. d3 a5 6. c3
Italian Game: Classical Variation, Giuoco Pianissimo: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. O-O Nf6 5. d3 d6 6. c3 a6
Italian Game: Classical Variation, Giuoco Pianissimo, with h6: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. O-O Nf6 5. d3 h6
Italian Game: Classical Variation, Giuoco Pianissimo: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. O-O Nf6 5. d3 h6 6. c3
Italian Game: Classical Variation, Giuoco Pianissimo, with h6: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. O-O Nf6 5. d3 h6 6. c3 d6
Italian Game: Giuoco Piano, Holzhausen Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. O-O Bc5 5. d4 Bxd4 6. Nxd4 Nxd4 7. Bg5 d6 8. f4 Qe7 9. fxe5 dxe5 10. Nc3
Italian Game: Giuoco Piano, Rosentreter Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. O-O Bc5 5. d4 Bxd4 6. Nxd4 Nxd4 7. Bg5 h6 8. Bh4 g5 9. f4
Italian Game: Classical Variation, Greco Gambit: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bc5 5. c3 Nf6 6. e5 d5

C55 Two Knights Defence
Italian Game: Two Knights Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6
Italian Game: Two Knights Defense, Modern Bishop's Opening: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3
Italian Game: Two Knights Defense, Modern Bishop's Opening: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3 Be7
Italian Game: Two Knights Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. O-O Bc5 5. d4 Bxd4 6. Nxd4 Nxd4 7. Bg5 d6

C56 Two Knights Defence
Italian Game: Scotch Gambit, Walbrodt-Baird Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d4 exd4 6. O-O
Italian Game: Scotch Gambit, Max Lange Attack Accepted: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. O-O Nf6 5. d4 exd4 6. e5 d5 7. exf6 dxc4 8. Re1+ Be6 9. fxg7
Italian Game: Two Knights Defense, Open Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4
Italian Game: Scotch Invitation Declined: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 d6
Italian Game: Scotch Gambit, Max Lange Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. e5 d5 6. Bb5 Ne4
Italian Game: Two Knights Defense, Keidansky Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. e5 d5 6. Bb5 Ne4 7. Nxd4 Bc5 8. Nxc6 Bxf2+ 9. Kf1 Qh4
Italian Game: Two Knights Defense, Perreux Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. Ng5
Italian Game: Scotch Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O
Italian Game: Two Knights Defense, Max Lange Attack, Berger Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Bc5 6. e5 d5 7. exf6 dxc4 8. Re1+ Be6 9. Ng5 Qd5 10. Nc3 Qf5 11. g4 Qg6 12. Nce4 Bb6 13. f4 O-O-O
Italian Game: Two Knights Defense, Max Lange Attack, Rubinstein Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Bc5 6. e5 d5 7. exf6 dxc4 8. Re1+ Be6 9. Ng5 Qd5 10. Nc3 Qf5 11. Nce4 Bf8
Italian Game: Two Knights Defense, Max Lange Attack, Krause Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Bc5 6. e5 Ng4 7. c3
Italian Game: Scotch Gambit, Double Gambit Accepted: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Nxe4
Italian Game: Scotch Gambit, Nakhmanson Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Nxe4 6. Nc3
Italian Game: Scotch Gambit, Anderssen Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Nxe4 6. Re1 d5 7. Bxd5 Qxd5 8. Nc3
Italian Game: Scotch Gambit, Anderssen Attack, Main Line: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. O-O Nxe4 6. Re1 d5 7. Bxd5 Qxd5 8. Nc3 Qa5 9. Nxe4 Be6 10. Bd2 Qd5 11. Bg5
Italian Game: Two Knights Defense, Max Lange Attack, Loman Defense: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bc5 5. O-O Nf6 6. e5 d5 7. exf6 dxc4 8. Re1+ Be6 9. Ng5 g6
Italian Game: Scotch Gambit, Max Lange Attack: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. O-O Bc5
Italian Game: Two Knights Defense, Max Lange Attack: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. O-O Bc5 6. e5
Italian Game: Scotch Gambit, Max Lange Attack, Long Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. O-O Bc5 6. e5 d5 7. exf6 dxc4 8. Re1+ Be6 9. Ng5 Qd5 10. Nc3 Qf5 11. Nce4
Italian Game: Scotch Gambit, Max Lange Attack, Spielmann Defense: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. O-O Bc5 6. e5 Ng4
Italian Game: Scotch Gambit, de Riviere Defense: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. O-O Be7
Italian Game: Scotch Gambit, Janowski Defense: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. O-O d6
Italian Game: Two Knights Defense, Yurdansky Attack: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. O-O Nxe4 6. Re1 d5 7. Bxd5 Qxd5 8. Nc3 Qa5 9. Nxe4 Be6 10. Bg5 h6 11. Bh4 g5 12. Nf6+ Ke7 13. b4
Italian Game: Scotch Gambit, Canal Variation: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. O-O Nxe4 6. Re1 d5 7. Nc3

C57 Two Knights Defence, including the Fried Liver Attack
Italian Game: Two Knights Defense, Knight Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5
Italian Game: Two Knights Defense, Traxler Counterattack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 Bc5
Italian Game: Two Knights Defense, Traxler Counterattack, Bishop Sacrifice Line: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 Bc5 5. Bxf7+
Italian Game: Two Knights Defense, Traxler Variation, Trencianske-Teplice Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 Bc5 5. Bxf7+ Ke7 6. d4
Italian Game: Two Knights Defense, Traxler Counterattack, Knight Sacrifice Line: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 Bc5 5. Nxf7
Italian Game: Two Knights Defense, Traxler Counterattack, King March Line: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 Bc5 5. Nxf7 Bxf2+ 6. Kxf2 Nxe4+ 7. Ke3
Italian Game: Two Knights Defense, Knight Attack, Normal Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5
Italian Game: Two Knights Defense, Ulvestad Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 b5
Italian Game: Two Knights Defense, Ulvestad Variation, Kurkin Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 b5 6. Bf1 h6 7. Nxf7
Italian Game: Two Knights Defense, Kloss Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nb4
Italian Game: Two Knights Defense, Fritz Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nd4
Italian Game: Two Knights Defense, Fritz, Gruber Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nd4 6. c3 b5 7. Bf1 Nxd5 8. Ne4
Italian Game: Two Knights Defense, Lolli Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. d4
Italian Game: Two Knights Defense, Pincus Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. d4 Bb4+
Italian Game: Two Knights Defense, Fried Liver Attack: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. Nxf7
Italian Game: Two Knights Defense, Fegatello Attack, Leonhardt Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. Nxf7 Kxf7 7. Qf3+ Ke6 8. Nc3 Nb4 9. Qe4 c6 10. a3 Na6 11. d4 Nc7
Italian Game: Two Knights Defense, Ponziani-Steinitz Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 Nxe4

C58 Two Knights Defence
Italian Game: Two Knights Defense, Polerio Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5
Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+
Italian Game: Two Knights Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 bxc6 8. Be2
Italian Game: Two Knights Defense, Polerio Defense, Bogoljubow Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 bxc6 8. Qf3
Italian Game: Two Knights Defense, Blackburne Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 bxc6 8. Qf3 cxb5
Italian Game: Two Knights Defense, Paoli Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 bxc6 8. Qf3 Qc7 9. Bd3
Italian Game: Two Knights Defense, Colman Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 bxc6 8. Qf3 Rb8
Italian Game: Two Knights Defense, Polerio Defense, Kieseritzky Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. d3
Italian Game: Two Knights Defense, Polerio Defense, Yankovich Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. d3 h6 7. Nf3 e4 8. Qe2 Nxc4 9. dxc4 Bc5 10. Nfd2
Italian Game: Two Knights Defense, Maróczy Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. d3 h6 7. Nf3 e4 8. Qe2 Nxc4 9. dxc4 Be7

C59 Two Knights Defence
Italian Game: Two Knights Defense, Polerio Defense, Suhle Defense: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 bxc6 8. Be2 h6
Italian Game: Two Knights Defense, Knorre Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 bxc6 8. Be2 h6 9. Nf3 e4 10. Ne5 Bd6 11. d4 Qc7 12. Bd2
Italian Game: Two Knights Defense, Polerio Defense, Göring Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 bxc6 8. Be2 h6 9. Nf3 e4 10. Ne5 Qc7
Italian Game: Two Knights Defense, Steinitz Variation: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 bxc6 8. Be2 h6 9. Nh3

C60 Ruy Lopez Unusual Black 3rd moves and 3...g6
Ruy Lopez: 1. e4 e5 2. Nf3 Nc6 3. Bb5
Ruy Lopez: Bulgarian Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a5
Ruy Lopez: Rotary-Albany Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 b6
Ruy Lopez: Alapin Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bb4
Ruy Lopez: Alapin Defense, Alapin Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bb4 4. c3 Ba5 5. Bxc6 dxc6
Ruy Lopez: Lucena Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Be7
Ruy Lopez: Spanish Countergambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 d5
Ruy Lopez: Spanish Countergambit, Harding Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 d5 4. Nxe5 Qg5 5. Nxc6
Ruy Lopez: Spanish Countergambit, Harding Countergambit, Fricke Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 d5 4. Nxe5 Qg5 5. O-O
Ruy Lopez: Nürnberg Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 f6
Ruy Lopez: Brentano Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 g5
Ruy Lopez: Fianchetto Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 g6
Ruy Lopez: Fianchetto Defense, Kevitz Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 g6 4. c3 f5
Ruy Lopez: Cozio Defense, Tartakower Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 g6 4. d4 exd4 5. Nxd4 Bg7 6. Be3 Nge7 7. Nc3 O-O 8. Qd2 d5
Ruy Lopez: Pollock Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Na5
Ruy Lopez: Retreat Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nb8
Ruy Lopez: Cozio Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nge7
Ruy Lopez: Cozio Defense, Paulsen Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nge7 4. Nc3 g6
Ruy Lopez: Vinogradov Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Qe7

C61 Ruy Lopez, Bird's Defence
Ruy Lopez: Bird Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nd4
Ruy Lopez: Bird Variation, Paulsen Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nd4 4. Nxd4 exd4 5. O-O Ne7

C62 Ruy Lopez, Old Steinitz Defence
Ruy Lopez: Steinitz Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6
Ruy Lopez: Old Steinitz Defense, Semi-Duras Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 Bd7 5. c4
Ruy Lopez: Steinitz Defense, Nimzowitsch Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 Bd7 5. Nc3 Nf6 6. Bxc6
Ruy Lopez: Steinitz Defense, Center Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 exd4 5. O-O

C63 Ruy Lopez, Schliemann Defence
Ruy Lopez: Schliemann Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 f5
Ruy Lopez: Schliemann Defense, Exchange Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. Bxc6
Ruy Lopez: Schliemann Defense, Schönemann Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. d4
Ruy Lopez: Schliemann Defense, Jaenisch Gambit Accepted: 1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. exf5
Ruy Lopez: Schliemann Defense, Dyckhoff Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. Nc3
Ruy Lopez: Schliemann Defense, Kostić Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. Nc3 fxe4 5. Nxe4 Be7
Ruy Lopez: Schliemann Defense, Möhring Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. Nc3 fxe4 5. Nxe4 d5 6. Nxe5 dxe4 7. Nxc6 Qd5
Ruy Lopez: Schliemann Defense, Classical Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. Nc3 fxe4 5. Nxe4 d5 6. Nxe5 dxe4 7. Nxc6 Qg5
Ruy Lopez: Schliemann Defense, Tartakower Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. Nc3 fxe4 5. Nxe4 Nf6

C64 Ruy Lopez, Classical (Cordel) Defence
Ruy Lopez: Classical Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5
Ruy Lopez: Classical Variation, Spanish Wing Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. b4
Ruy Lopez: Classical Variation, Central Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3
Ruy Lopez: Classical Variation, Charousek Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3 Bb6
Ruy Lopez: Classical Variation, Konikowski Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3 d5
Ruy Lopez: Classical Variation, Cordel Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3 f5
Ruy Lopez: Classical Defense, Boden Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3 Qe7
Ruy Lopez: Classical Defense, Zaitsev Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. O-O Nd4 5. b4
Ruy Lopez: Classical Defense, Benelux Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Bc5 5. c3 O-O 6. d4 Bb6
Ruy Lopez: Classical Variation, Modern Main Line: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Bc5 5. c3 O-O 6. d4 Bb6 7. Bg5

C65 Ruy Lopez, Berlin Defence including Mortimer Trap
Ruy Lopez: Berlin Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6
Ruy Lopez: Berlin Defense, Kaufmann Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 Bc5 5. Be3
Ruy Lopez: Berlin Defense, Anderssen Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 d6 5. Bxc6+
Ruy Lopez: Berlin Defense, Duras Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 d6 5. c4
Ruy Lopez: Berlin Defense, Mortimer Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 Ne7
Ruy Lopez: Berlin Defense, Mortimer Trap: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 Ne7 5. Nxe5 c6
Ruy Lopez: Berlin Defense, Nyholm Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d4 exd4 5. O-O
Ruy Lopez: Halloween Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. Nxe5
Ruy Lopez: Berlin Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O
Ruy Lopez: Berlin Defense, Beverwijk Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Bc5
Ruy Lopez: Classical Variation, Zukertort Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Bc5 5. c3
Ruy Lopez: Berlin Defense, Fishing Pole Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Ng4

C66 Ruy Lopez, Berlin Defence, 4.0-0 d6
Ruy Lopez: Berlin Defense, Tarrasch Trap: 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 Bd7 5. Nc3 Nf6 6. O-O Be7 7. Re1 O-O
Ruy Lopez: Berlin Defense, Improved Steinitz Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6
Ruy Lopez: Berlin Defense, Hedgehog Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Bd7 6. Nc3 Be7
Ruy Lopez: Berlin Defense, Closed Bernstein Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Bd7 6. Nc3 Be7 7. Bg5
Ruy Lopez: Berlin Defense, Closed Showalter Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Bd7 6. Nc3 Be7 7. Bxc6
Ruy Lopez: Berlin Defense, Closed Wolf Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Bd7 6. Nc3 exd4
Ruy Lopez: Closed Berlin Defense, Chigorin Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Nd7

C67 Ruy Lopez, Berlin Defence, Open Variation
Ruy Lopez: Berlin Defense, Rio Gambit Accepted: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4
Ruy Lopez: Berlin Defense, Rosenthal Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 a6
Ruy Lopez: Berlin Defense, Rio de Janeiro Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7
Ruy Lopez: Berlin Defense, Minckwitz Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7 6. dxe5
Ruy Lopez: Berlin Defense, Trifunovic Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7 6. Qe2 d5
Ruy Lopez: Berlin Defense, Pillsbury Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7 6. Qe2 Nd6 7. Bxc6 bxc6 8. dxe5 Nb7 9. b3
Ruy Lopez: Berlin Defense, Zukertort Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7 6. Qe2 Nd6 7. Bxc6 bxc6 8. dxe5 Nb7 9. c4
Ruy Lopez: Berlin Defense, Rio de Janeiro Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7 6. Qe2 Nd6 7. Bxc6 bxc6 8. dxe5 Nb7 9. Nc3 O-O 10. Re1 Nc5 11. Nd4 Ne6 12. Be3 Nxd4 13. Bxd4 c5
Ruy Lopez: Berlin Defense, Winawer Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7 6. Qe2 Nd6 7. Bxc6 bxc6 8. dxe5 Nb7 9. Nd4
Ruy Lopez: Berlin Defense, Cordel Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Be7 6. Qe2 Nd6 7. Bxc6 bxc6 8. dxe5 Nf5
Ruy Lopez: Berlin Defense, l'Hermet Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Nd6
Ruy Lopez: Open Berlin Defense, Showalter Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Nd6 6. Ba4
Ruy Lopez: Berlin Defense, l'Hermet Variation, Westerinen Line: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Nd6 6. Bxc6 dxc6 7. dxe5 Ne4
Ruy Lopez: Berlin Defense, l'Hermet Variation, Berlin Wall Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Nd6 6. Bxc6 dxc6 7. dxe5 Nf5 8. Qxd8+ Kxd8
Ruy Lopez: Berlin Defense, Berlin Wall: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Nd6 6. Bxc6 dxc6 7. dxe5 Nf5 8. Qxd8+ Kxd8 9. Nc3 Bd7
Ruy Lopez: Open Berlin Defense, l'Hermet Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Nd6 6. dxe5

C68 Ruy Lopez, Exchange Variation
Ruy Lopez: Exchange Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6
Ruy Lopez: Exchange Variation, Lutikov Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 bxc6
Ruy Lopez: Exchange Variation, Alekhine Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. d4 exd4 6. Qxd4 Qxd4 7. Nxd4 Bd6
Ruy Lopez: Exchange, Alekhine Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. d4 exd4 6. Qxd4 Qxd4 7. Nxd4 Bd7
Ruy Lopez: Exchange Variation, Keres Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. Nc3
Ruy Lopez: Exchange Variation, Romanovsky Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. Nc3 f6 6. d3

C69 Ruy Lopez, Exchange Variation, 5.0-0
Ruy Lopez: Exchange Variation, Normal Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O
Ruy Lopez: Exchange Variation, King's Bishop Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O Bd6
Ruy Lopez: Exchange Variation, Alapin Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O Bg4 6. h3 h5
Ruy Lopez: Exchange Variation, Gligoric Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O f6
Ruy Lopez: Exchange Variation, Bronstein Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O Qd6

C70 Ruy Lopez, 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4
Ruy Lopez: Morphy Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6
Ruy Lopez: Morphy Defense, Caro Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 b5
Ruy Lopez: Morphy Defense, Graz Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 b5 5. Bb3 Bc5
Ruy Lopez: Morphy Defense, Norwegian Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 b5 5. Bb3 Na5
Ruy Lopez: Morphy Defense, Norwegian Variation, Nightingale Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 b5 5. Bb3 Na5 6. Bxf7+
Ruy Lopez: Morphy Defense, Alapin's Defense Deferred: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Bb4
Ruy Lopez: Morphy Defense, Classical Defense Deferred: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Bc5
Ruy Lopez: Morphy Defense, Schliemann Defense Deferred: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 f5
Ruy Lopez: Morphy Defense, Schliemann Defense Deferred, Jaenisch Gambit Deferred: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 f5 5. exf5
Ruy Lopez: Morphy Defense, Fianchetto Defense Deferred: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 g6
Ruy Lopez: Bird's Defense Deferred: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nd4
Ruy Lopez: Morphy Defense, Cozio Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nge7

C71 Ruy Lopez, Modern Steinitz Defence including Noah's Ark Trap
Ruy Lopez: Noah's Ark Trap: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 b5 5. Bb3 d6 6. d4 Nxd4 7. Nxd4 exd4 8. Qxd4 c5
Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6
Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c4
Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. Nc3

C72 Ruy Lopez, Modern Steinitz Defence 5.0-0
Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. O-O
Ruy Lopez: Closed, Kecskemet Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. O-O Bd7 6. c3 Nf6 7. d4 Be7 8. Nbd2 O-O 9. Re1 Be8

C73 Ruy Lopez, Modern Steinitz Defence, Richter Variation
Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. Bxc6+ bxc6 6. d4
Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. Bxc6+ bxc6 6. d4 f6

C74 Ruy Lopez, Modern Steinitz Defence
Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c3
Ruy Lopez: Morphy Defense, Modern Steinitz Defense, Siesta Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c3 f5
Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c3 f5 6. exf5 Bxf5 7. O-O

C75 Ruy Lopez, Modern Steinitz Defence
Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c3 Bd7
Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c3 Bd7 6. d4 Nge7

C76 Ruy Lopez, Modern Steinitz Defence, Fianchetto (Bronstein) Variation
Ruy Lopez: Morphy Defense, Modern Steinitz Defense, Fianchetto Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 g6 4. c3 a6 5. Ba4 d6 6. d4 Bd7

C77 Ruy Lopez, Morphy Defence
Ruy Lopez: Morphy Defense, Bayreuth Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. Bxc6
Ruy Lopez: Morphy Defense, Jaffe Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. c3
Ruy Lopez: Morphy Defense, Anderssen Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. d3
Ruy Lopez: Morphy Defense, Duras Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. d3 d6 6. c4
Ruy Lopez: Morphy Defense, Mackenzie Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. d4
Ruy Lopez: Morphy Defense, Tarrasch Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. Nc3
Ruy Lopez: Morphy Defense, Wormald Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. Qe2
Ruy Lopez: Wormald Attack, Grünfeld Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. Qe2 b5 6. Bb3 Be7 7. d4 d6 8. c3 Bg4

C78 Ruy Lopez, 5.0-0
Ruy Lopez: Morphy Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O
Ruy Lopez: Morphy Defense, Arkhangelsk Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3 Bb7
Ruy Lopez: Morphy Defense, Wing Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3 Be7 7. a4
Ruy Lopez: Morphy Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3 d6
Ruy Lopez: Rabinovich Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3 d6 7. Ng5 d5 8. exd5 Nd4 9. Re1 Bc5 10. Rxe5+ Kf8
Ruy Lopez: Morphy Defense, Neo-Arkhangelsk Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Bc5
Ruy Lopez: Central Countergambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O d5
Ruy Lopez: Brix Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O g6

C79 Ruy Lopez, Steinitz Defence Deferred (Russian Defence)
Ruy Lopez: Morphy Defense, Steinitz Deferred: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O d6
Ruy Lopez: Steinitz Defense Deferred, Lipnitsky Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O d6 6. Bxc6+ bxc6 7. d4 Bg4
Ruy Lopez: Morphy Defense, Steinitz Deferred: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O d6 6. Bxc6+ bxc6 7. d4 Nxe4
Ruy Lopez: Steinitz Defense Deferred, Boleslavsky Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O d6 6. Bxc6+ bxc6 7. d4 Nxe4 8. Re1 f5 9. dxe5 d5 10. Nc3

C80 Ruy Lopez, Open (Tarrasch) Defence
Ruy Lopez: Open: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4
Ruy Lopez: Open: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4
Ruy Lopez: Open: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3
Ruy Lopez: Open, Schlechter Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. a4 Nxd4
Ruy Lopez: Open, Berger Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. a4 Nxd4 9. Nxd4 exd4 10. Nc3
Ruy Lopez: Open, Harksen Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. c4
Ruy Lopez: Open: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5
Ruy Lopez: Open, Main Line: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6
Ruy Lopez: Open, Bernstein Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Nbd2
Ruy Lopez: Open, Bernstein Variation, Luther Line: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Nbd2 Bc5 10. Qe1
Ruy Lopez: Open, Karpov Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Nbd2 Nc5 10. c3 d4 11. Ng5
Ruy Lopez: Open, Zukertort Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Ne7
Ruy Lopez: Open, Richter Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. d5
Ruy Lopez: Open, Friess Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Nxe5
Ruy Lopez: Open, Riga Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 exd4
Ruy Lopez: Open, Knorre Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. Nc3
Ruy Lopez: Morphy Defense, Tartakower Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. Qe2
Ruy Lopez: Open, Skipworth Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. Re1 d5

C81 Ruy Lopez, Open, Howell Attack
Ruy Lopez: Open, Howell Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2
Ruy Lopez: Open, Howell Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Be7 10. c4
Ruy Lopez: Open, Howell Attack, Ekstrom Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Be7 10. Rd1 O-O 11. c4 bxc4 12. Bxc4 Qd7

C82 Ruy Lopez, Open, 9.c3
Ruy Lopez: Open: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. c3
Ruy Lopez: Open, Italian Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. c3 Bc5
Ruy Lopez: Open, St. Petersburg Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. c3 Bc5 10. Nbd2
Ruy Lopez: Open, Dilworth Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. c3 Bc5 10. Nbd2 O-O 11. Bc2 Nxf2
Ruy Lopez: Open, Motzko Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. c3 Bc5 10. Qd3
Ruy Lopez: Open, Motzko Attack, Nenarokov Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. c3 Bc5 10. Qd3 Ne7
Ruy Lopez: Open, Berlin Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. c3 Nc5

C83 Ruy Lopez, Open, Classical Defence
Ruy Lopez: Open, Classical Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. c3 Be7
Ruy Lopez: Open, Malkin Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. c3 Be7 10. Nbd2 O-O 11. Qe2
Ruy Lopez: Open, Breslau Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. c3 Be7 10. Re1 O-O 11. Nd4 Nxe5
Ruy Lopez: Open, Tarrasch Trap: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. c3 Be7 10. Re1 O-O 11. Nd4 Qd7 12. Nxe6 fxe6 13. Rxe4
Ruy Lopez: Open, Classical Defense, Main Line: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 Be7 7. Re1 b5 8. Bb3 d5 9. dxe5 Be6 10. c3

C84 Ruy Lopez, Closed Defence
Ruy Lopez: Closed: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7
Ruy Lopez: Closed, Martinez Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. d3
Ruy Lopez: Closed, Center Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. d4
Ruy Lopez: Closed, Basque Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. d4 exd4 7. e5 Ne4 8. c3
Ruy Lopez: Closed, Center Attack, Basque Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. d4 exd4 7. e5 Ne4 8. c3 dxc3
Ruy Lopez: Closed, Morphy Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Nc3

C85 Ruy Lopez, Exchange Variation Doubly Deferred (DERLD)
Ruy Lopez: Closed, Delayed Exchange: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Bxc6

C86 Ruy Lopez, Worrall Attack
Ruy Lopez: Closed, Worrall Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Qe2
Ruy Lopez: Closed, Worrall Attack, Delayed Castling Line: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Qe2 b5 7. Bb3 d6
Ruy Lopez: Closed, Worrall Attack, Castling Line: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Qe2 b5 7. Bb3 O-O

C87 Ruy Lopez, Closed, Averbakh Variation
Ruy Lopez: Closed, Averbakh Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 d6

C88 Ruy Lopez, Closed
Ruy Lopez: Closed: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3
Ruy Lopez: Closed, Trajkovic Counterattack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 Bb7
Ruy Lopez: Closed, Balla Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 Na5 9. Bc2 c5 10. d4 Qc7 11. a4
Ruy Lopez: Closed, Leonhardt Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 Na5 9. Bc2 c5 10. d4 Qc7 11. h3 Nc6 12. d5 Nb8 13. Nbd2 g5
Ruy Lopez: Closed, Alekhine Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 Na5 9. Bc2 c5 10. d4 Qc7 11. Nbd2 O-O 12. Nf1 Bg4 13. Ne3 Bxf3 14. Qxf3
Ruy Lopez: Closed, Rosen Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. d4
Ruy Lopez: Noah's Ark Trap: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. d4 Nxd4 9. Nxd4 exd4 10. Qxd4 c5
Ruy Lopez: Closed: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O
Ruy Lopez: Closed, Anti-Marshall: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. a4

C89 Ruy Lopez, Marshall Counterattack
Ruy Lopez: Marshall Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3 d5
Ruy Lopez: Marshall Attack, Steiner Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3 d5 9. exd5 e4
Ruy Lopez: Marshall Attack, Modern Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3 d5 9. exd5 Nxd5 10. Nxe5 Nxe5 11. Rxe5 c6
Ruy Lopez: Marshall Attack, Re3 Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3 d5 9. exd5 Nxd5 10. Nxe5 Nxe5 11. Rxe5 c6 12. Bxd5 cxd5 13. d4 Bd6 14. Re3
Ruy Lopez: Marshall Attack, Main Line: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3 d5 9. exd5 Nxd5 10. Nxe5 Nxe5 11. Rxe5 c6 12. d4
Ruy Lopez: Marshall Attack, Modern Main Line: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3 d5 9. exd5 Nxd5 10. Nxe5 Nxe5 11. Rxe5 c6 12. d4 Bd6 13. Re1 Qh4 14. g3 Qh3
Ruy Lopez: Marshall Attack, Main Line, Spassky Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3 d5 9. exd5 Nxd5 10. Nxe5 Nxe5 11. Rxe5 c6 12. d4 Bd6 13. Re1 Qh4 14. g3 Qh3 15. Be3 Bg4 16. Qd3 Rae8 17. Nd2 Re6 18. a4 Qh5
Ruy Lopez: Marshall Attack, Original Marshall Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3 d5 9. exd5 Nxd5 10. Nxe5 Nxe5 11. Rxe5 Nf6

C90 Ruy Lopez, Closed, 7...d6
Ruy Lopez: Closed: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O
Ruy Lopez: Closed, Suetin Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. a3
Ruy Lopez: Closed, Lutikov Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. Bc2
Ruy Lopez: Closed, Pilnik Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. d3 d6 9. c3

C91 Ruy Lopez, Closed, 9.d4
Ruy Lopez: Closed, Yates Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. d4
Ruy Lopez: Closed, Bogoljubow Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. d4 Bg4
Ruy Lopez: Closed, Yates Variation, Short Attack: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. d4 Bg4 10. a4

C92 Ruy Lopez, Closed, 9.h3
Ruy Lopez: Closed: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3
Ruy Lopez: Closed, Flohr System: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Bb7
Ruy Lopez: Closed, Smyslov-Breyer-Zaitsev Hybrid: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Bb7 10. d4 Re8 11. Nbd2 Bf8 12. a3 h6
Ruy Lopez: Closed, Kholmov Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Be6
Ruy Lopez: Closed, Karpov Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Nd7
Ruy Lopez: Closed, Zaitsev System: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Re8

C93 Ruy Lopez, Closed, Smyslov Defence
Ruy Lopez: Closed, Smyslov Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 h6

C94 Ruy Lopez, Closed, Breyer Defence, 10.d3
Ruy Lopez: Closed, Breyer Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Nb8
Ruy Lopez: Closed, Breyer Defense, Quiet Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Nb8 10. d3

C95 Ruy Lopez, Closed, Breyer Defence, 10.d4
Ruy Lopez: Closed, Breyer: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Nb8 10. d4
Ruy Lopez: Closed, Breyer Defense, Zaitsev Hybrid: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Nb8 10. d4 Nbd7
Ruy Lopez: Closed, Breyer Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Nb8 10. d4 Nbd7 11. Nbd2 Bb7 12. Bc2 c5
Ruy Lopez: Closed, Breyer Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Nb8 10. d4 Nbd7 11. Nh4

C96 Ruy Lopez, Closed, 8...Na5
Ruy Lopez: Closed, Chigorin Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2
Ruy Lopez: Closed, Chigorin Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 c5
Ruy Lopez: Closed, Borisenko Variation: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 c5 11. d4 Nc6
Ruy Lopez: Closed, Keres Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 c5 11. d4 Nd7
Ruy Lopez: Closed, Rossolimo Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 c6 11. d4 Qc7
Ruy Lopez: Closed, Chigorin Defense, Gajewski Gambit: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 d5

C97 Ruy Lopez, Closed, Chigorin Defence
Ruy Lopez: Closed, Chigorin Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5
Ruy Lopez: Closed, Chigorin Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 c5 11. d4 Qc7
Ruy Lopez: Closed, Chigorin, Yugoslav System: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 Bd7 13. Nf1 Rfe8 14. Ne3 g6

C98 Ruy Lopez, Closed, Chigorin, 12...Nc6
Ruy Lopez: Closed, Chigorin Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 Nc6
Ruy Lopez: Closed, Chigorin Defense: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 Nc6 13. dxc5

C99 Ruy Lopez, Closed, Chigorin, 12...cxd4
Ruy Lopez: Closed, Chigorin Defense, Panov System: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 cxd4 13. cxd4

D – Closed Games and Semi-Closed Games

1.d4 d5: Closed Game (D00–D69)
1.d4 Nf6 2.c4 g6 with 3...d5: Grünfeld Defence (D70–D99)

D00–D69

1.d4 d5: Closed Game

D00 Queen's Pawn Game (including Blackmar–Diemer Gambit, Halosar Trap and others)
Queen's Pawn Game: 1. d4 d5
Queen's Pawn Game: Accelerated London System: 1. d4 d5 2. Bf4
Queen's Pawn Game: Accelerated London System, Steinitz Countergambit: 1. d4 d5 2. Bf4 c5
Queen's Pawn Game: Accelerated London System, Steinitz Countergambit Accepted: 1. d4 d5 2. Bf4 c5 3. dxc5
Queen's Pawn Game: Accelerated London System, Steinitz Countergambit, Morris Countergambit: 1. d4 d5 2. Bf4 c5 3. e4
Queen's Pawn Game: Accelerated London System, Steinitz Countergambit, Morris Countergambit Accepted: 1. d4 d5 2. Bf4 c5 3. e4 dxe4
Queen's Pawn Game: Levitsky Attack: 1. d4 d5 2. Bg5
Queen's Pawn Game: Levitsky Attack, Welling Variation: 1. d4 d5 2. Bg5 Bg4
Queen's Pawn Game: 1. d4 d5 2. e3
Queen's Pawn Game: 1. d4 d5 2. e3 Nf6
Queen's Pawn Game: Stonewall Attack: 1. d4 d5 2. e3 Nf6 3. Bd3
Blackmar-Diemer Gambit: 1. d4 d5 2. e4
Blackmar-Diemer Gambit: Fritz Attack: 1. d4 d5 2. e4 dxe4 3. Bc4
Blackmar-Diemer Gambit: Diemer-Rosenberg Attack: 1. d4 d5 2. e4 dxe4 3. Be3
Blackmar-Diemer Gambit: Blackmar Gambit: 1. d4 d5 2. e4 dxe4 3. f3
Blackmar-Diemer Gambit: Zeller Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Bf5
Blackmar-Diemer Gambit: Zeller Defense, Soller Attack: 1. d4 d5 2. e4 dxe4 3. Nc3 Bf5 4. f3 Nf6 5. Bc4
Blackmar-Diemer Gambit: Reversed Albin Countergambit: 1. d4 d5 2. e4 dxe4 3. Nc3 c5
Blackmar-Diemer Gambit: Lemberger Countergambit: 1. d4 d5 2. e4 dxe4 3. Nc3 e5
Blackmar-Diemer Gambit: Lemberger Countergambit, Soller Attack: 1. d4 d5 2. e4 dxe4 3. Nc3 e5 4. Be3
Blackmar-Diemer Gambit: Lemberger Countergambit, Endgame Variation: 1. d4 d5 2. e4 dxe4 3. Nc3 e5 4. dxe5
Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack: 1. d4 d5 2. e4 dxe4 3. Nc3 e5 4. Nge2
Blackmar-Diemer Gambit: Lemberger Countergambit, Lange Gambit: 1. d4 d5 2. e4 dxe4 3. Nc3 e5 4. Nxe4
Blackmar-Diemer Gambit: Lemberger Countergambit, Sneiders Attack: 1. d4 d5 2. e4 dxe4 3. Nc3 e5 4. Qh5
Blackmar-Diemer Gambit: Netherlands Variation: 1. d4 d5 2. e4 dxe4 3. Nc3 f5
Blackmar-Diemer Gambit: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6
Blackmar-Diemer Gambit: Rasa-Studier Gambit: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. Be3
Blackmar-Diemer Gambit: von Popiel Gambit: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. Bg5
Blackmar-Diemer Gambit: von Popiel Gambit, Zilbermints Variation: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. Bg5 Bf5 5. Bxf6 exf6 6. g4 Bg6 7. Qe2 Bb4 8. Qb5+
Blackmar-Diemer Gambit Declined: Gedult Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 a6
Blackmar-Diemer Gambit Declined: Vienna Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 Bf5
Blackmar-Diemer Gambit Declined: Brombacher Countergambit: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 c5
Blackmar-Diemer Gambit Declined: O'Kelly Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 c6
Blackmar-Diemer Gambit Declined: Langeheinicke Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 e3
Blackmar-Diemer Gambit Declined: Elbert Countergambit: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 e5
Blackmar-Diemer Gambit Declined: Weinsbach Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 e6
Blackmar-Diemer Gambit Accepted: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3
Blackmar-Diemer Gambit Accepted: Ritter Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 b6
Blackmar-Diemer Gambit Accepted: Gunderam Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bf5
Blackmar-Diemer Gambit Accepted: Gunderam Defense, Stader Variation: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bf5 6. Ne5 e6 7. g4 Be4
Blackmar-Diemer Gambit Accepted: Teichmann Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bg4
Blackmar-Diemer Gambit Accepted: Teichmann Defense, Classical Variation: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bg4 6. h3 Bxf3 7. Qxf3 c6 8. Be3
Blackmar-Diemer Gambit Accepted: Teichmann Defense, Seidel-Hall Attack: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bg4 6. h3 Bxf3 7. Qxf3 c6 8. g4
Blackmar-Diemer Gambit Accepted: Teichmann Defense, Ciesielski Variation: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bg4 6. h3 Bxf3 7. Qxf3 c6 8. Qf2
Blackmar-Diemer Gambit Accepted: Kaulich Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 c5
Blackmar-Diemer Gambit Accepted: Ziegler Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 c6
Blackmar-Diemer Gambit Accepted: Euwe Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 e6
Blackmar-Diemer Gambit Accepted: Euwe Defense, Zilbermints Gambit: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 e6 6. Bg5 Be7 7. Bd3 Nc6 8. O-O Nxd4 9. Kh1
Blackmar-Diemer Gambit Accepted: Bogoljubow Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 g6
Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Mad Dog Attack: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 g6 6. Bc4 Bg7 7. h4
Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Nimzowitsch Attack: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 g6 6. Bc4 Bg7 7. Ne5
Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Kloss Attack: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 g6 6. Bc4 Bg7 7. O-O O-O 8. Kh1
Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Studier Attack: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 g6 6. Bc4 Bg7 7. O-O O-O 8. Qe1
Blackmar-Diemer Gambit Accepted: Schlutter Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Nbd7
Blackmar-Diemer Gambit Accepted: Pietrowsky Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Nc6
Blackmar-Diemer Gambit Accepted: Holwell Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Qd6
Blackmar-Diemer Gambit Accepted: Ryder Gambit: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Qxf3
Blackmar-Diemer Gambit Declined: Lamb Defense: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 Nc6
Queen's Pawn Game: Mason Attack: 1. d4 d5 2. f4
Queen's Pawn Game: Zurich Gambit: 1. d4 d5 2. g4
Queen's Pawn Game: Chigorin Variation: 1. d4 d5 2. Nc3
Queen's Pawn Game: Chigorin Variation, Alburt Defense: 1. d4 d5 2. Nc3 Bf5
Queen's Pawn Game: Chigorin Variation, Anti-Veresov: 1. d4 d5 2. Nc3 Bg4
Queen's Pawn Game: Chigorin Variation, Irish Gambit: 1. d4 d5 2. Nc3 c5
Queen's Pawn Game: Chigorin Variation, Shaviliuk Gambit: 1. d4 d5 2. Nc3 e5
Queen's Pawn Game: Chigorin Variation: 1. d4 d5 2. Nc3 e6
Queen's Pawn Game: Chigorin Variation, Shropshire Defense: 1. d4 d5 2. Nc3 h5
Amazon Attack: 1. d4 d5 2. Qd3
Queen's Pawn Game: Chigorin Variation, Fianchetto Defense: 1. d4 g6 2. Nf3 Bg7 3. Nc3 d5
Queen's Pawn Game: Hübsch Gambit: 1. d4 Nf6 2. Nc3 d5 3. e4

D01 Richter–Veresov Attack
Rapport-Jobava System, with e6: 1. d4 d5 2. Nc3 e6 3. Bf4
Rapport-Jobava System: 1. d4 d5 2. Nc3 Nf6 3. Bf4
Rapport-Jobava System: 1. d4 d5 2. Nc3 Nf6 3. Bf4 e6
Rapport-Jobava System: 1. d4 d5 2. Nc3 Nf6 3. Bf4 g6
Richter-Veresov Attack: 1. d4 Nf6 2. Nc3 d5 3. Bg5
Richter-Veresov Attack: 1. d4 Nf6 2. Nc3 d5 3. Bg5 Bf5
Richter-Veresov Attack: Veresov Variation: 1. d4 Nf6 2. Nc3 d5 3. Bg5 Bf5 4. Bxf6
Richter-Veresov Attack: Richter Variation: 1. d4 Nf6 2. Nc3 d5 3. Bg5 Bf5 4. f3
Richter-Veresov Attack: Malich Gambit: 1. d4 Nf6 2. Nc3 d5 3. Bg5 c5 4. Bxf6 gxf6 5. e4 dxe4 6. d5
Richter-Veresov Attack: Two Knights System: 1. d4 Nf6 2. Nc3 d5 3. Bg5 Nbd7 4. Nf3
Richter-Veresov Attack: Two Knights System, Grünfeld Defense: 1. d4 Nf6 2. Nc3 d5 3. Bg5 Nbd7 4. Nf3 g6
Richter-Veresov Attack: Boyce Defense: 1. d4 Nf6 2. Nc3 d5 3. Bg5 Ne4

D02 Queen's Pawn Game, 2.Nf3 (including the London System)
Queen's Pawn Game: Zukertort Variation: 1. d4 d5 2. Nf3
Queen's Gambit Declined: Baltic Defense, Pseudo-Slav: 1. d4 d5 2. Nf3 Bf5 3. c4 e6 4. Nc3 c6
Queen's Pawn Game: Krause Variation: 1. d4 d5 2. Nf3 c5
Queen's Pawn Game: Chandler Gambit: 1. d4 d5 2. Nf3 c5 3. g3 cxd4 4. Bg2
Queen's Pawn Game: Levitsky Attack, Euwe Variation, Modern Line: 1. d4 d5 2. Nf3 c6 3. Bg5 h6 4. Bh4 Qb6
Queen's Pawn Game: London System, with e6: 1. d4 d5 2. Nf3 e6 3. Bf4
Queen's Pawn Game: Chigorin Variation: 1. d4 d5 2. Nf3 Nc6
Queen's Pawn Game: Symmetrical Variation: 1. d4 d5 2. Nf3 Nf6
Queen's Pawn Game: London System: 1. d4 d5 2. Nf3 Nf6 3. Bf4
Queen's Pawn Game: Zilbermints Countergambit: 1. d4 d5 2. Nf3 Nf6 3. c4 b5
Queen's Pawn Game: Symmetrical Variation, Pseudo-Catalan: 1. d4 d5 2. Nf3 Nf6 3. g3
Queen's Pawn Game: London System, Pterodactyl Variation: 1. d4 g6 2. Nf3 Bg7 3. Bf4 c5 4. c3 cxd4 5. cxd4 Qa5+
London System: Poisoned Pawn Variation: 1. d4 Nf6 2. Nf3 d5 3. Bf4 c5 4. e3 Qb6 5. Nc3
Queen's Pawn Game: Anti-Torre: 1. Nf3 d5 2. d4 Bg4

D03 Torre Attack, Tartakower Variation
Queen's Pawn Game: Torre Attack: 1. d4 d5 2. Nf3 Nf6 3. Bg5
Queen's Pawn Game: Torre Attack, Grünfeld Variation: 1. d4 d5 2. Nf3 Nf6 3. Bg5 g6
Queen's Pawn Game: Torre Attack, Gossip Variation: 1. d4 d5 2. Nf3 Nf6 3. Bg5 Ne4

D04 Queen's Pawn Game, Colle System
Queen's Pawn Game: Colle System: 1. d4 d5 2. Nf3 Nf6 3. e3
Queen's Pawn Game: Colle System, Anti-Colle: 1. d4 d5 2. Nf3 Nf6 3. e3 Bf5
Queen's Pawn Game: Colle System, Grünfeld Formation: 1. d4 d5 2. Nf3 Nf6 3. e3 g6 4. Bd3 Bg7

D05 Queen's Pawn Game, Zukertort Variation (including Colle System)
Queen's Pawn Game: Zukertort Variation: 1. d4 d5 2. Nf3 c5 3. e3 Nf6 4. Nbd2 e6 5. b3
Queen's Pawn Game: Colle System: 1. d4 d5 2. Nf3 Nf6 3. e3 e6
Queen's Pawn Game: Colle System: 1. d4 d5 2. Nf3 Nf6 3. e3 e6 4. Bd3
Rubinstein Opening: Semi-Slav Defense: 1. d4 d5 2. Nf3 Nf6 3. e3 e6 4. Bd3 Bd6 5. O-O O-O 6. b3 Nbd7 7. Bb2
Rubinstein Opening: 1. d4 Nf6 2. Nf3 e6 3. e3 c5 4. Bd3 d5 5. b3
Rubinstein Opening: Bogoljubow Defense: 1. d4 Nf6 2. Nf3 e6 3. e3 c5 4. Bd3 d5 5. b3 Nc6 6. O-O Bd6 7. Bb2 O-O
Rubinstein Opening: Classical Defense: 1. d4 Nf6 2. Nf3 e6 3. e3 c5 4. Bd3 d5 5. b3 Nc6 6. O-O Be7 7. Bb2 O-O
Queen's Pawn Game: Colle System, Traditional Colle: 1. d4 Nf6 2. Nf3 e6 3. e3 c5 4. Bd3 d5 5. c3

D06 Queen's Gambit (including the Baltic Defence, Marshall Defence and Symmetrical Defence)
Queen's Gambit: 1. d4 d5 2. c4
Queen's Gambit Declined: Zilbermints Gambit: 1. d4 d5 2. c4 b5
Queen's Gambit Declined: Baltic Defense: 1. d4 d5 2. c4 Bf5
Queen's Gambit Declined: Baltic Defense, Argentinian Gambit: 1. d4 d5 2. c4 Bf5 3. cxd5 Bxb1 4. Qa4+ c6 5. dxc6 Nxc6
Queen's Gambit Declined: Baltic Defense, Pseudo-Chigorin: 1. d4 d5 2. c4 Bf5 3. Nc3 e6 4. Nf3 Nc6
Queen's Gambit Declined: Baltic Defense, Queen Attack Deferred: 1. d4 d5 2. c4 Bf5 3. Nc3 e6 4. Qb3
Queen's Gambit Declined: Baltic Defense, Queen Attack: 1. d4 d5 2. c4 Bf5 3. Qb3
Queen's Gambit Declined: Austrian Defense: 1. d4 d5 2. c4 c5
Queen's Gambit Declined: Austrian Defense, Gusev Countergambit: 1. d4 d5 2. c4 c5 3. cxd5 Nf6
Queen's Gambit Declined: Austrian Defense, Haberditz Variation: 1. d4 d5 2. c4 c5 3. cxd5 Nf6 4. e4 Nxe4 5. dxc5 Qa5+
Queen's Gambit Declined: Austrian Attack, Salvio Countergambit: 1. d4 d5 2. c4 c5 3. dxc5 d4
Queen's Gambit Declined: Marshall Defense: 1. d4 d5 2. c4 Nf6
Queen's Gambit Declined: Marshall Defense, Tan Gambit: 1. d4 d5 2. c4 Nf6 3. cxd5 c6

D07 QGD, Chigorin Defence
Queen's Gambit Declined: Chigorin Defense: 1. d4 d5 2. c4 Nc6
Queen's Gambit Declined: Chigorin Defense, Exchange Variation: 1. d4 d5 2. c4 Nc6 3. cxd5 Qxd5
Queen's Gambit Declined: Chigorin Defense, Exchange Variation, Costa's Line: 1. d4 d5 2. c4 Nc6 3. cxd5 Qxd5 4. e3 e5 5. Nc3 Bb4 6. Bd2 Bxc3 7. Bxc3 exd4 8. Ne2
Queen's Gambit Declined: Chigorin Defense: 1. d4 d5 2. c4 Nc6 3. Nc3
Queen's Gambit Declined: Chigorin Defense: 1. d4 d5 2. c4 Nc6 3. Nc3 dxc4
Queen's Gambit Declined: Chigorin Defense, Janowski Variation: 1. d4 d5 2. c4 Nc6 3. Nc3 dxc4 4. Nf3
Queen's Gambit Declined: Chigorin Defense, Modern Gambit: 1. d4 d5 2. c4 Nc6 3. Nc3 dxc4 4. Nf3 Nf6
Queen's Gambit Declined: Chigorin Defense, Tartakower Gambit: 1. d4 d5 2. c4 Nc6 3. Nc3 e5
Queen's Gambit Declined: Chigorin Defense, Main Line: 1. d4 d5 2. c4 Nc6 3. Nf3 Bg4
Queen's Gambit Declined: Chigorin Defense, Main Line, Alekhine Variation: 1. d4 d5 2. c4 Nc6 3. Nf3 Bg4 4. Qa4
Queen's Gambit Declined: Chigorin Defense, Lazard Gambit: 1. d4 d5 2. c4 Nc6 3. Nf3 e5

D08 QGD, Albin Countergambit and Lasker Trap
Queen's Gambit Declined: Albin Countergambit: 1. d4 d5 2. c4 e5
Queen's Gambit Declined: Albin Countergambit, Lasker Trap: 1. d4 d5 2. c4 e5 3. dxe5 d4 4. e3 Bb4+ 5. Bd2 dxe3
Queen's Gambit Declined: Albin Countergambit, Normal Line: 1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3
Queen's Gambit Declined: Albin Countergambit, Tartakower Defense: 1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 c5
Queen's Gambit Declined: Albin Countergambit, Modern Line: 1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. Nbd2
Queen's Gambit Declined: Albin Countergambit, Krenosz Variation: 1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. Nbd2 Bg4 6. h3 Bxf3 7. Nxf3 Bb4+ 8. Bd2 Qe7
Queen's Gambit Declined: Albin Countergambit, Janowski Variation: 1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. Nbd2 f6
Queen's Gambit Declined: Albin Countergambit, Balogh Variation: 1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. Nbd2 Qe7

D09 QGD, Albin Countergambit, 5.g3
Queen's Gambit Declined: Albin Countergambit, Fianchetto Variation: 1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. g3
Queen's Gambit Declined: Albin Countergambit, Fianchetto Variation, Be6 Line: 1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. g3 Be6
Queen's Gambit Declined: Albin Countergambit, Fianchetto Variation, Bf5 Line: 1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. g3 Bf5
Queen's Gambit Declined: Albin Countergambit, Fianchetto Variation, Bg4 Line: 1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. g3 Bg4

D10 QGD, Slav Defence
Slav Defense: 1. d4 d5 2. c4 c6
Slav Defense: Exchange Variation: 1. d4 d5 2. c4 c6 3. cxd5
Slav Defense: Exchange Variation, Boor Attack: 1. d4 d5 2. c4 c6 3. cxd5 cxd5 4. Nc3 Nf6 5. f3
Slav Defense: Diemer Gambit: 1. d4 d5 2. c4 c6 3. e4
Slav Defense: 1. d4 d5 2. c4 c6 3. Nc3
Slav Defense: 1. d4 d5 2. c4 c6 3. Nc3 dxc4
Slav Defense: Slav Gambit, Alekhine Attack: 1. d4 d5 2. c4 c6 3. Nc3 dxc4 4. e4
Slav Defense: Winawer Countergambit: 1. d4 d5 2. c4 c6 3. Nc3 e5
Slav Defense: Winawer Countergambit, Anti-Winawer Gambit: 1. d4 d5 2. c4 c6 3. Nc3 e5 4. e4

D11 QGD, Slav Defence, 3.Nf3
Slav Defense: Modern Line: 1. d4 d5 2. c4 c6 3. Nf3
Slav Defense: Bonet Gambit: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Bg5
Slav Defense: Quiet Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3
Slav Defense: Quiet Variation, Pin Defense: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bg4
Slav Defense: Breyer Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nbd2

D12 QGD, Slav Defence, 4.e3 Bf5
Slav Defense: Quiet Variation, Schallopp Defense: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bf5
Slav Defense: Quiet Variation, Amsterdam Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bf5 5. cxd5 cxd5 6. Nc3 e6 7. Ne5 Nfd7
Slav Defense: Quiet Variation, Landau Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bf5 5. cxd5 cxd5 6. Qb3 Qc8 7. Bd2 e6 8. Na3

D13 QGD, Slav Defence, Exchange Variation
Slav Defense: Exchange Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. cxd5 cxd5
Slav Defense: Exchange Variation, Schallopp Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bf5 5. cxd5 cxd5 6. Nc3

D14 QGD, Slav Defence, Exchange Variation
Slav Defense: Exchange Variation, Symmetrical Line: 1. d4 d5 2. c4 c6 3. cxd5 cxd5 4. Nc3 Nf6 5. Nf3 Nc6 6. Bf4 Bf5
Slav Defense: Exchange Variation, Trifunovic Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. cxd5 cxd5 5. Nc3 Nc6 6. Bf4 Bf5 7. e3 e6 8. Qb3 Bb4

D15 QGD, Slav, 4.Nc3
Slav Defense: Three Knights Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3
Slav Defense: Chebanenko Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 a6
Slav Defense: Chebanenko Variation, Advance System: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 a6 5. c5
Slav Defense: Two Knights Attack: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4
Slav Defense: Alekhine Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e3
Slav Defense: Geller Gambit: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4
Slav Defense: Geller Gambit: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 b5 6. e5
Slav Defense: Schlechter Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 g6
Slav Defense: Süchting Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 Qb6

D16 QGD, Slav Accepted, Alapin Variation
Slav Defense: Alapin Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4
Slav Defense: Steiner Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bg4
Slav Defense: Soultanbeieff Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 e6
Slav Defense: Smyslov Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Na6

D17 QGD, Slav Defence, Czech Defence
Slav Defense: Czech Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5
Slav Defense: Czech Variation, Krause Attack: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Ne5
Slav Defense: Czech Variation, Wiesbaden Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Ne5 e6
Slav Defense: Czech Variation, Wiesbaden Variation, Sharp Line: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Ne5 e6 7. f3 Bb4 8. e4
Slav Defense: Czech Variation, Krause Attack, Fazekas Gambit: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Ne5 Na6 7. e4
Slav Defense: Czech Variation, Carlsbad Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Ne5 Nbd7 7. Nxc4 Qc7 8. g3 e5
Slav Defense: Czech Variation, Carlsbad Variation, Morozevich Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Ne5 Nbd7 7. Nxc4 Qc7 8. g3 e5 9. dxe5 Nxe5 10. Bf4 Nfd7 11. Bg2 g5
Slav Defense: Czech Variation, Bled Attack: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Nh4

D18 QGD, Dutch Variation
Slav Defense: Czech Variation, Classical System: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3
Slav Defense: Czech Variation, Lasker Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 Na6

D19 QGD, Dutch Variation
Slav Defense: Czech Variation, Dutch Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 Bb4 8. O-O
Slav Defense: Czech Variation, Classical System, Main Line: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 Bb4 8. O-O O-O 9. Qe2
Slav Defense: Czech Variation, Dutch Variation, Sämisch Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 Bb4 8. O-O O-O 9. Qe2 Ne4 10. g4

D20 Queen's Gambit Accepted without 3.Nf3 (Central Variation, Old Variation, and atypical moves by White)
Queen's Gambit Accepted: 1. d4 d5 2. c4 dxc4
Queen's Gambit Accepted: Old Variation: 1. d4 d5 2. c4 dxc4 3. e3
Queen's Gambit Accepted: Old Variation, Billinger Gambit: 1. d4 d5 2. c4 dxc4 3. e3 e5 4. Bxc4 exd4 5. Qb3 Qe7 6. a3
Queen's Gambit Accepted: Old Variation, Korchnoi Gambit: 1. d4 d5 2. c4 dxc4 3. e3 e5 4. Bxc4 exd4 5. Qb3 Qe7 6. Kf1
Queen's Gambit Accepted: Old Variation, Novikov Gambit: 1. d4 d5 2. c4 dxc4 3. e3 e5 4. Bxc4 exd4 5. Qb3 Qe7 6. Nd2
Queen's Gambit Accepted: Old Variation, Christensen Gambit: 1. d4 d5 2. c4 dxc4 3. e3 e5 4. Bxc4 exd4 5. Qb3 Qe7 6. Nf3
Queen's Gambit Accepted: Saduleto Variation: 1. d4 d5 2. c4 dxc4 3. e4
Queen's Gambit Accepted: Central Variation, Greco Variation: 1. d4 d5 2. c4 dxc4 3. e4 b5
Queen's Gambit Accepted: Central Variation, Rubinstein Defense: 1. d4 d5 2. c4 dxc4 3. e4 c5
Queen's Gambit Accepted: Central Variation, Rubinstein Defense, Yefimov Gambit: 1. d4 d5 2. c4 dxc4 3. e4 c5 4. d5 b5
Queen's Gambit Accepted: Linares Variation: 1. d4 d5 2. c4 dxc4 3. e4 c5 4. d5 Nf6 5. Nc3 b5
Queen's Gambit Accepted: Central Variation, McDonnell Defense: 1. d4 d5 2. c4 dxc4 3. e4 e5
Queen's Gambit Accepted: Central Variation, McDonnell Defense, Somov Gambit: 1. d4 d5 2. c4 dxc4 3. e4 e5 4. Bxc4
Queen's Gambit Accepted: Schwartz Defense: 1. d4 d5 2. c4 dxc4 3. e4 f5
Queen's Gambit Accepted: Central Variation, Modern Defense: 1. d4 d5 2. c4 dxc4 3. e4 Nc6
Queen's Gambit Accepted: Central Variation, Alekhine System: 1. d4 d5 2. c4 dxc4 3. e4 Nf6
Queen's Gambit Accepted: Accelerated Mannheim Variation: 1. d4 d5 2. c4 dxc4 3. Qa4+

D21 QGA, 3.Nf3
Queen's Gambit Accepted: Normal Variation: 1. d4 d5 2. c4 dxc4 3. Nf3
Queen's Gambit Accepted: Alekhine Defense, Borisenko-Furman Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e4
Queen's Gambit Accepted: Slav Gambit: 1. d4 d5 2. c4 dxc4 3. Nf3 b5
Queen's Gambit Accepted: Gunsberg Defense: 1. d4 d5 2. c4 dxc4 3. Nf3 c5
Queen's Gambit Accepted: Rosenthal Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 e6
Queen's Gambit Accepted: Godes Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 Nd7

D22 QGA, Alekhine Defence (3...a6)
Queen's Gambit Accepted: Alekhine Defense: 1. d4 d5 2. c4 dxc4 3. Nf3 a6
Queen's Gambit Accepted: Alekhine Defense, Haberditz Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 b5
Queen's Gambit Accepted: Alekhine Defense, Alatortsev Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 Bg4 5. Bxc4 e6 6. d5

D23 Queen's Gambit Accepted (3...Nf6)
Queen's Gambit Accepted: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6
Queen's Gambit Accepted: Mannheim Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Qa4+

D24 QGA, 4.Nc3
Queen's Gambit Accepted: Showalter Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Nc3
Queen's Gambit Accepted: Bogoljubow Defense: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Nc3 a6 5. e4
Queen's Gambit Accepted: Gunsberg Defense, Prianishenmo Gambit: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Nc3 c5 5. d5 e6 6. e4 exd5 7. e5

D25 QGA, 4.e3
Queen's Gambit Accepted: Normal Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3
Queen's Gambit Accepted: Winawer Defense: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Be6
Queen's Gambit Accepted: Janowski-Larsen Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4
Queen's Gambit Accepted: Smyslov Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 g6

D26 QGA, Classical Variation
Queen's Gambit Accepted: Normal Variation, Traditional System: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6
Queen's Gambit Accepted: Classical Defense: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5
Queen's Gambit Accepted: Classical Defense, Normal Line: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O
Queen's Gambit Accepted: Classical Defense, Steinitz Variation, Exchange Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O cxd4
Queen's Gambit Accepted: Classical Defense, Steinitz Variation, Development Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O Nc6
Queen's Gambit Accepted: Classical, Furman Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. Qe2 a6 7. dxc5 Bxc5 8. O-O Nc6 9. e4 b5 10. e5

D27 QGA, Classical Variation
Queen's Gambit Accepted: Classical Defense, Russian Gambit: 1. d4 d5 2. c4 dxc4 3. e3 Nf6 4. Bxc4 e6 5. Nf3 c5 6. O-O a6 7. e4
Queen's Gambit Accepted: Classical Defense, Main Line: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6
Queen's Gambit Accepted: Classical Defense, Rubinstein Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. a4
Queen's Gambit Accepted: Furman Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. dxc5 Bxc5

D28 QGA, Classical Variation 7.Qe2
Queen's Gambit Accepted: Classical Defense, Alekhine System: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Qe2
Queen's Gambit Accepted: Classical Defense, Alekhine System: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Qe2 b5
Queen's Gambit Accepted: Classical, Flohr Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Qe2 b5 8. Bb3 Nc6 9. Rd1 c4 10. Bc2 Nb4 11. Nc3 Nxc2 12. Qxc2 Bb7 13. d5 Qc7

D29 QGA, Classical Variation 8...Bb7
Queen's Gambit Accepted: Classical Defense, Alekhine System, Main Line: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Qe2 b5 8. Bb3 Bb7
Queen's Gambit Accepted: Classical Defense, Alekhine System, Smyslov Variation: 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. Qe2 b5 8. Bb3 Bb7 9. Rd1 Nbd7 10. Nc3 Bd6

D30 Queen's Gambit Declined: Orthodox Defence
Semi-Slav Defense: Quiet Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nbd2
Semi-Slav Defense: Quiet Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nbd2 Nbd7
Queen's Gambit Declined: Semmering Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nbd2 Nbd7 6. Bd3 c5
Queen's Gambit Declined: Stonewall Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. Nbd2 Ne4 6. Bd3 f5
Queen's Gambit Declined: 1. d4 d5 2. c4 e6
Queen's Gambit Declined: Tarrasch Defense, Pseudo-Tarrasch: 1. d4 d5 2. c4 e6 3. Nf3 c5
Queen's Gambit Declined: Tarrasch Defense, Pseudo-Tarrasch Bishop Attack: 1. d4 d5 2. c4 e6 3. Nf3 c5 4. cxd5 exd5 5. Bg5
Queen's Gambit Declined: Spielmann Variation: 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. e3 c6 5. Nbd2 g6
Queen's Gambit Declined: Traditional Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Bg5
Queen's Gambit Declined: Vienna Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Bg5 Bb4+
Queen's Gambit Declined: Capablanca Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Bg5 h6
Queen's Gambit Declined: Capablanca Variation: 1. d4 Nf6 2. Nf3 e6 3. c4 d5 4. Bg5 c6 5. Nbd2 Nbd7 6. e3

D31 QGD, 3.Nc3
Queen's Gambit Declined: Queen's Knight Variation: 1. d4 d5 2. c4 e6 3. Nc3
Queen's Gambit Declined: Janowski Variation: 1. d4 d5 2. c4 e6 3. Nc3 a6
Queen's Gambit Declined: Charousek Variation: 1. d4 d5 2. c4 e6 3. Nc3 Be7
Queen's Gambit Declined: Charousek Variation, Miladinovic Gambit: 1. d4 d5 2. c4 e6 3. Nc3 Be7 4. e4 dxe4 5. f3
Queen's Gambit Declined: Uhlmann Variation: 1. d4 d5 2. c4 e6 3. Nc3 Be7 4. Nf3 Nf6 5. Bg5 h6 6. Bh4 O-O 7. Rc1 dxc4
Semi-Slav Defense: Accelerated Move Order: 1. d4 d5 2. c4 e6 3. Nc3 c6
Semi-Slav Defense: Anti-Noteboom, Stonewall Variation, Portisch Gambit: 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e3 f5 5. g4
Semi-Slav Defense: Marshall Gambit: 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e4
Semi-Slav Defense: Gunderam Gambit: 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e4 dxe4 5. f3
Semi-Slav Defense: Marshall Gambit, Main Line: 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e4 dxe4 5. Nxe4 Bb4+ 6. Bd2
Semi-Slav Defense: Marshall Gambit, Tolush Variation: 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e4 dxe4 5. Nxe4 Bb4+ 6. Bd2 Qxd4 7. Bxb4 Qxe4+ 8. Be2 c5 9. Bxc5 Qxg2
Semi-Slav Defense: Marshall Gambit, Forgotten Variation: 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e4 dxe4 5. Nxe4 Bb4+ 6. Nc3
Semi-Slav Defense: Noteboom Variation: 1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4
Queen's Gambit Declined: Semi-Slav, Abrahams Variation: 1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4 5. a4 Bb4 6. e3 b5 7. Bd2 a5
Semi-Slav Defense: Noteboom Variation, Abrahams Variation: 1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4 5. a4 Bb4 6. e3 Bxc3+ 7. bxc3 b5 8. axb5 cxb5
Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Variation: 1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4 5. Bg5
Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Variation, Belyavsky Line: 1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4 5. Bg5 f6
Queen's Gambit Declined: Semi-Slav, Koomen Variation: 1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4 5. e3 b5 6. a4 Bb4 7. Bd2 Qe7
Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Gambit: 1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4 5. g3
Queen's Gambit Declined: Semi-Slav, Junge Variation: 1. d4 d5 2. c4 e6 3. Nf3 c6 4. Nc3 dxc4 5. a4 Bb4 6. e3 b5 7. Bd2 Qb6
Queen's Gambit Declined: Alapin Variation: 1. d4 e6 2. c4 b6 3. Nc3 d5

D32 QGD, Tarrasch Defence
Tarrasch Defense: 1. d4 d5 2. c4 e6 3. Nc3 c5
Tarrasch Defense: Schara Gambit: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 cxd4
Tarrasch Defense: von Hennig Gambit: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 cxd4 5. Qxd4 Nc6 6. Qd1 exd5 7. Qxd5 Be6
Queen's Gambit Declined: Tarrasch Defense: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5
Tarrasch Defense: Tarrasch Gambit: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. dxc5 d4 6. Na4 b5
Tarrasch Defense: Marshall Gambit: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. e4
Tarrasch Defense: Two Knights Variation: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3
Tarrasch Defense: Grünfeld Gambit: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. dxc5 d4 7. Na4 b5
Tarrasch Defense: Symmetrical Variation: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. e3 Nf6 5. Nf3 Nc6

D33 QGD, Tarrasch, Schlechter–Rubinstein System
Tarrasch Defense: Rubinstein System: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3
Tarrasch Defense: Swedish Variation: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 c4
Tarrasch Defense: Swedish Variation, Central Break: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 c4 7. e4
Tarrasch Defense: Prague Variation: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6
Tarrasch Defense: Wagner Variation: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Bg4
Tarrasch Defense: Dubov Tarrasch: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 cxd4 8. Nxd4 Bc5

D34 QGD, Tarrasch, 7...Be7
Tarrasch Defense: Prague Variation, Main Line: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7
Tarrasch Defense: Classical Variation: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. O-O O-O
Tarrasch Defense: Classical Variation, Carlsbad Variation: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. O-O O-O 9. Bg5
Tarrasch Defense: Classical Variation, Endgame Variation: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. O-O O-O 9. Bg5 Be6
Tarrasch Defense: Classical Variation, Advance Variation: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. O-O O-O 9. Bg5 c4
Tarrasch Defense: Classical Variation, Spassky Variation: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. O-O O-O 9. Bg5 cxd4 10. Nxd4 h6 11. Be3 Bg4
Tarrasch Defense: Classical Variation, Main Line: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. O-O O-O 9. Bg5 cxd4 10. Nxd4 h6 11. Be3 Re8
Tarrasch Defense: Classical Variation, Chandler Variation: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. O-O O-O 9. Bg5 cxd4 10. Nxd4 h6 11. Be3 Re8 12. Rc1 Be6
Tarrasch Defense: Classical Variation, Petursson Variation: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. O-O O-O 9. Bg5 cxd4 10. Nxd4 Re8
Tarrasch Defense: Classical Variation, Réti Variation: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. O-O O-O 9. dxc5 Bxc5 10. Na4
Tarrasch Defense: Classical Variation, Classical Tarrasch Gambit: 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3 Nc6 6. g3 Nf6 7. Bg2 Be7 8. O-O O-O 9. dxc5 d4
Queen's Gambit Declined: Tarrasch Defense, Stoltz Variation: 1. d4 d5 2. c4 e6 3. Nf3 c5 4. cxd5 exd5 5. g3 Nc6 6. Bg2 Nf6 7. O-O Be7 8. Nc3 O-O 9. Bg5 Be6 10. Rc1 b6
Tarrasch Defense: Classical Variation, Bogoljubow Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 c5 4. Nf3 d5 5. cxd5 exd5 6. g3 Nc6 7. Bg2 Be7 8. O-O O-O 9. Bg5 Be6 10. Rc1 c4

D35 QGD, Exchange Variation
Queen's Gambit Declined: Normal Defense: 1. d4 d5 2. c4 e6 3. Nc3 Nf6
Queen's Gambit Declined: Harrwitz Attack: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bf4
Queen's Gambit Declined: Exchange Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. cxd5
Queen's Gambit Declined: Exchange Variation, Positional Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. cxd5 exd5 5. Bg5
Queen's Gambit Declined: Exchange Variation, Chameleon Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. cxd5 exd5 5. Bg5 Be7 6. e3 O-O 7. Bd3 Nbd7 8. Qc2 Re8 9. Nge2 Nf8 10. O-O-O
Queen's Gambit Declined: Exchange Variation, Positional Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. cxd5 exd5 5. Bg5 c6
Queen's Gambit Declined: Exchange Variation, Sämisch Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Nbd7 5. cxd5 exd5 6. Bf4

D36 QGD, Exchange, positional line, 6.Qc2
Queen's Gambit Declined: Exchange Variation, Reshevsky Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. cxd5 exd5 5. Bg5 c6 6. Qc2

D37 QGD, 4.Nf3
Queen's Gambit Declined: Harrwitz Attack, Fianchetto Defense: 1. d4 d5 2. c4 e6 3. Nc3 Be7 4. Nf3 Nf6 5. Bf4 O-O 6. e3 b6
Queen's Gambit Declined: Harrwitz Attack, Orthodox Defense: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Be7 5. Bf4 O-O 6. e3 c6
Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense, Blockade Line: 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Nf3 Be7 5. Bf4 O-O 6. e3 Nbd7 7. c5
Queen's Gambit Declined: Three Knights Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3
Queen's Gambit Declined: Harrwitz Attack: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bf4
Queen's Gambit Declined: Harrwitz Attack, Main Line: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bf4 O-O 6. e3 c5 7. dxc5 Bxc5
Queen's Gambit Declined: Harrwitz Attack: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bf4 O-O 6. e3 c5 7. dxc5 Bxc5 8. Qc2 Nc6 9. a3 Qa5 10. O-O-O
Queen's Gambit Declined: Harrwitz Attack: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bf4 O-O 6. e3 c5 7. dxc5 Bxc5 8. Qc2 Nc6 9. Rd1 Qa5 10. a3
Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bf4 O-O 6. e3 Nbd7
Queen's Gambit Declined: Miles Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. Qc2
Queen's Gambit Declined: Three Knights, Vienna Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 dxc4
Queen's Gambit Declined: Vienna Variation, Quiet Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 dxc4 5. e3
Queen's Gambit Declined: Barmen Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Nbd7
Queen's Gambit Declined: Knight Defense, Alekhine Gambit: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Nbd7 5. Bg5 h6 6. Bh4 dxc4

D38 QGD, Ragozin Variation
Queen's Gambit Declined: Ragozin Defense: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Bb4
Queen's Gambit Declined: Westphalian Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Bb4 5. Bg5 Nbd7 6. e3 c5
Queen's Gambit Declined: Ragozin Defense, Alekhine Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Bb4 5. Qa4+

D39 QGD, Ragozin, Vienna Variation
Queen's Gambit Declined: Ragozin Defense, Vienna Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Bb4 5. Bg5 dxc4

D40 QGD, Semi-Tarrasch Defence
Queen's Gambit Declined: Semi-Tarrasch Defense, Pillsbury Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. Bg5
Queen's Gambit Declined: Semi-Tarrasch Defense, Symmetrical Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. e3 Nc6 6. Bd3 Bd6 7. O-O O-O
Queen's Gambit Declined: Semi-Tarrasch Defense, Levenfish Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. e3 Nc6 6. Bd3 Bd6 7. O-O O-O 8. Qe2 Qe7 9. dxc5 Bxc5 10. e4
Queen's Gambit Declined: Semi-Tarrasch Defense: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5

D41 QGD, Semi-Tarrasch, 5.cxd5
Queen's Gambit Declined: Semi-Tarrasch Defense, San Sebastian Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 c5 7. Nf3 cxd4 8. cxd4 Bb4+ 9. Bd2 Qa5
Queen's Gambit Declined: Semi-Tarrasch Defense, Kmoch Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. cxd5 Nxd5 6. e4 Nxc3 7. bxc3 cxd4 8. cxd4 Bb4+ 9. Bd2 Bxd2+ 10. Qxd2 O-O 11. Bb5
Queen's Gambit Declined: Semi-Tarrasch Defense: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5
Queen's Gambit Declined: Semi-Tarrasch Defense, Pillsbury Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. e3
Queen's Gambit Declined: Semi-Tarrasch Defense, Exchange Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. e4

D42 QGD, Semi-Tarrasch, 7.Bd3
Queen's Gambit Declined: Semi-Tarrasch Defense, Main Line: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. e3 Nc6 7. Bd3

D43 QGD, Semi-Slav Defence
Semi-Slav Defense: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6
Semi-Slav Defense: Anti-Moscow Gambit: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 h6 6. Bh4
Queen's Gambit Declined: Hastings Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 h6 6. Bxf6 Qxf6 7. Qb3

D44 QGD, Semi-Slav, 5.Bg5 dxc4
Semi-Slav Defense Accepted: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 dxc4
Semi-Slav Defense: Botvinnik Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 dxc4 6. e4
Semi-Slav Defense: Botvinnik Variation, Ekstrom Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 g5 9. exf6 gxh4 10. Ne5
Semi-Slav Defense: Botvinnik Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 g5 9. Nxg5
Semi-Slav Defense: Botvinnik Variation, Lilienthal Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 g5 9. Nxg5 hxg5 10. Bxg5 Nbd7 11. g3
Semi-Slav Defense: Botvinnik Variation, Szabo Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 g5 9. Nxg5 hxg5 10. Bxg5 Nbd7 11. Qf3
Semi-Slav Defense: Botvinnik Variation, Alatortsev System: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 g5 9. Nxg5 Nd5

D45 QGD, Semi-Slav, 5.e3
Semi-Slav Defense: Main Line: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3
Semi-Slav Defense: Accelerated Meran Variation: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 a6
Semi-Slav Defense: Normal Variation: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7
Semi-Slav Defense: Stoltz Variation: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Qc2
Semi-Slav Defense: Stoltz Variation: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Qc2 b6 7. b3
Semi-Slav Defense: Stoltz Variation, Center Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Qc2 Bd6 7. e4
Semi-Slav Defense: Stoltz Variation, Center Variation, Mikhalchishin Line: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Qc2 Bd6 7. e4 dxe4 8. Nxe4 Nxe4 9. Qxe4 e5 10. dxe5
Semi-Slav Defense: Stoltz Variation, Shabalov Attack: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Qc2 Bd6 7. g4
Semi-Slav Defense: Rubinstein System: 1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 Nf6 5. e3 Nbd7 6. Ne5
Semi-Slav Defense: Stoltz Variation: 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. e3 e6 5. Nc3 Nbd7 6. Qc2 Bd6 7. b3
Semi-Slav Defense: Stoltz Variation: 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. e3 e6 5. Nc3 Nbd7 6. Qc2 Bd6 7. b3 O-O 8. Bb2
Semi-Slav Defense: Stonewall Defense: 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nc3 e6 5. e3 Ne4 6. Bd3 f5

D46 QGD, Semi-Slav, 6.Bd3
Semi-Slav Defense: Main Line: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3
Semi-Slav Defense: Romih Variation: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 Bb4
Semi-Slav Defense: Chigorin Defense: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 Bd6
Semi-Slav Defense: Chigorin Defense: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 Bd6 7. Qc2
Semi-Slav Defense: Bogoljubow Variation: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 Be7
Semi-Slav Defense: Main Line: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Qc2 b6 7. b3 Bb7 8. Bd3 Be7 9. O-O O-O 10. Bb2

D47 QGD, Semi-Slav, 7.Bc4
Semi-Slav Defense: Semi-Meran Variation: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4
Semi-Slav Defense: Meran Variation: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5
Semi-Slav Defense: Meran Variation, Wade Variation: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 Bb7
Semi-Slav Defense: Meran Variation, Wade Variation, Larsen Variation: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 Bb7 9. e4 b4 10. Na4 c5 11. e5 Nd5
Semi-Slav Defense: Meran Variation, Wade Variation, Kaidanov Gambit: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 Bb7 9. e4 b4 10. Na4 c5 11. e5 Nd5 12. O-O cxd4 13. Nxd4
Semi-Slav Defense: Meran Variation, Lundin Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 b4

D48 QGD, Meran, 8...a6
Semi-Slav Defense: Meran Variation: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6
Semi-Slav Defense: Meran Variation: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 c5
Semi-Slav Defense: Meran Variation, Old Variation: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 c5 10. e5
Semi-Slav Defense: Meran Variation, Reynolds' Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 c5 10. d5
Semi-Slav Defense: Meran Variation, Pirc Variation: 1. d4 d5 2. c4 e6 3. Nc3 c6 4. e3 Nf6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 b4

D49 QGD, Meran, 11.Nxb5
Semi-Slav Defense: Meran Variation, Blumenfeld Variation: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 c5 10. e5 cxd4 11. Nxb5
Semi-Slav Defense: Meran Variation, Rabinovich Variation: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 c5 10. e5 cxd4 11. Nxb5 Ng4
Semi-Slav Defense: Meran Variation, Stahlberg Variation: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 c5 10. e5 cxd4 11. Nxb5 Nxe5 12. Nxe5 axb5 13. Qf3
Semi-Slav Defense: Meran Variation, Rellstab Attack: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 c5 10. e5 cxd4 11. Nxb5 Nxe5 12. Nxe5 axb5 13. O-O Qd5 14. Qe2 Ba6 15. Bg5
Semi-Slav Defense: Meran Variation, Sozin Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 c5 10. e5 cxd4 11. Nxb5 Nxe5
Semi-Slav Defense: Meran Variation, Sozin Variation: 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 c5 10. e5 cxd4 11. Nxb5 Nxe5 12. Nxe5 axb5 13. O-O

D50 QGD, 4.Bg5
Queen's Gambit Declined: Modern Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5
Queen's Gambit Declined: Been-Koomen Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5
Queen's Gambit Declined: Pseudo-Tarrasch Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5 5. cxd5
Queen's Gambit Declined: Pseudo-Tarrasch Variation, Canal Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5 5. cxd5 Qb6
Queen's Gambit Declined: Semi-Tarrasch Defense, Krause Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5 5. Nf3 cxd4 6. Nxd4 e5 7. Ndb5 a6 8. Qa4
Queen's Gambit Declined: Pseudo-Tarrasch Variation, Primitive Pillsbury Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5 5. Nf3 cxd4 6. Qxd4

D51 QGD, 4.Bg5 Nbd7 (Cambridge Springs Defence and Elephant Trap)
Queen's Gambit Declined: Modern Variation, Knight Defense: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7
Queen's Gambit Declined: Modern Variation, Knight Defense: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3
Queen's Gambit Declined: Manhattan Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 Bb4
Queen's Gambit Declined: Modern Variation, Knight Defense: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6
Queen's Gambit Declined: Capablanca Variation, Anti-Cambridge Springs Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. a3
Queen's Gambit Declined: Alekhine Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. Nf3 c6 6. e4
Queen's Gambit Declined: Rochlin Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. Nf3 c6 6. Rc1 Qa5 7. Bd2

D52 QGD
Queen's Gambit Declined: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 Nbd7 6. e3
Queen's Gambit Declined: Cambridge Springs Defense: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 Nbd7 6. e3 Qa5
Queen's Gambit Declined: Cambridge Springs Defense: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 Nbd7 6. e3 Qa5 7. cxd5
Queen's Gambit Declined: Cambridge Springs Defense, Yugoslav Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 Nbd7 6. e3 Qa5 7. cxd5 Nxd5
Queen's Gambit Declined: Cambridge Springs Defense, Bogoljubow Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 Nbd7 6. e3 Qa5 7. Nd2 Bb4 8. Qc2
Queen's Gambit Declined: Cambridge Springs Defense, Rubinstein Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 Nbd7 6. e3 Qa5 7. Nd2 dxc4
Queen's Gambit Declined: Cambridge Springs Defense, Capablanca Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. Nf3 Qa5 7. Bxf6
Queen's Gambit Declined: Cambridge Springs Defense, Argentine Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 c6 6. Nf3 Qa5 7. Nd2 Bb4 8. Qc2 O-O 9. Bh4

D53 QGD, 4.Bg5 Be7
Queen's Gambit Declined: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7
Queen's Gambit Declined: Modern Variation, Heral Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. Bxf6
Queen's Gambit Declined: Lasker Defense: 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Bg5 Be7 5. e3 Ne4

D54 QGD, Anti-neo-orthodox Variation
Queen's Gambit Declined: Neo-Orthodox Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Bg5 Be7 5. e3 O-O 6. Rc1

D55 QGD, 6.Nf3
Queen's Gambit Declined: Pillsbury Attack: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 d5 5. cxd5 exd5 6. Bg5 Be7 7. e3 O-O 8. Bd3 Bb7 9. Ne5
Queen's Gambit Declined: Neo-Orthodox Variation, Main Line: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 h6 6. Bh4 O-O 7. e3
Queen's Gambit Declined: Anti-Tartakower Variation, Petrosian Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 h6 6. Bxf6 Bxf6 7. e3 O-O 8. Rc1 c6 9. Bd3 Nd7 10. O-O dxc4 11. Bxc4
Queen's Gambit Declined: Modern Variation, Normal Line: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3
Queen's Gambit Declined: Neo-Orthodox Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 h6
Queen's Gambit Declined: Anti-Tartakower Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 h6 7. Bxf6

D56 QGD, Lasker Defence
Queen's Gambit Declined: Lasker Defense: 1. d4 d5 2. c4 e6 3. Nc3 Be7 4. Nf3 Nf6 5. Bg5 h6 6. Bh4 O-O 7. e3 Ne4
Queen's Gambit Declined: Lasker Defense, Russian Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 7. Bh4 Ne4 8. Bxe7 Qxe7 9. Qc2 Nf6 10. Bd3 dxc4 11. Bxc4 c5 12. O-O Nc6 13. Rfd1 Bd7
Queen's Gambit Declined: Lasker Defense, Teichmann Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 h6 6. Bh4 O-O 7. e3 Ne4 8. Bxe7 Qxe7 9. Qc2

D57 QGD, Lasker Defence, Main line
Queen's Gambit Declined: Lasker Defense, Main Line: 1. d4 d5 2. c4 e6 3. Nc3 Be7 4. Nf3 Nf6 5. Bg5 h6 6. Bh4 O-O 7. e3 Ne4 8. Bxe7 Qxe7 9. cxd5 Nxc3 10. bxc3
Queen's Gambit Declined: Lasker Defense, Bernstein Variation, Mar del Plata Gambit: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 h6 7. Bh4 Ne4 8. Bxe7 Qxe7 9. cxd5 Nxc3 10. bxc3 exd5 11. Qb3 Rd8 12. c4 Be6
Queen's Gambit Declined: Lasker Defense, Bernstein Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Bg5 Be7 5. e3 h6 6. Bh4 O-O 7. Nf3 Ne4 8. Bxe7 Qxe7 9. cxd5 Nxc3 10. bxc3 exd5 11. Qb3 Qd6

D58 QGD, Tartakower (Tartakower–Makogonov–Bondarevsky) System
Queen's Gambit Declined: Tartakower Defense, Exchange Variation: 1. d4 d5 2. c4 e6 3. Nc3 Be7 4. Nf3 Nf6 5. Bg5 h6 6. Bh4 O-O 7. e3 b6 8. cxd5 exd5
Queen's Gambit Declined: Tartakower Defense: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 h6 6. Bh4 O-O 7. e3 b6

D59 QGD, Tartakower (Tartakower–Makogonov–Bondarevsky) System, 8.cxd5 Nxd5
Queen's Gambit Declined: Tartakower Defense, Makogonov Exchange Variation: 1. d4 d5 2. c4 e6 3. Nc3 Be7 4. Nf3 Nf6 5. Bg5 h6 6. Bh4 O-O 7. e3 b6 8. cxd5 Nxd5
Queen's Gambit Declined: Tartakower Defense: 1. d4 d5 2. c4 e6 3. Nc3 Be7 4. Nf3 Nf6 5. Bg5 h6 6. Bh4 O-O 7. e3 b6 8. cxd5 Nxd5 9. Bxe7 Qxe7 10. Nxd5 exd5 11. Rc1 Be6

D60 QGD, Orthodox Defence
Queen's Gambit Declined: Orthodox Defense, Rauzer Variation: 1. d4 d5 2. Nf3 Nf6 3. c4 e6 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Qb3
Queen's Gambit Declined: Orthodox Defense: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7
Queen's Gambit Declined: Orthodox Defense, Botvinnik Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Bd3

D61 QGD, Orthodox Defence, Rubinstein Variation
Queen's Gambit Declined: Orthodox Defense, Rubinstein Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Qc2

D62 QGD, Orthodox Defence, 7.Qc2 c5, 8.cxd5 (Rubinstein)
Queen's Gambit Declined: Orthodox Defense, Rubinstein Variation, Flohr Line: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Qc2 c5 8. cxd5

D63 QGD, Orthodox Defence, 7.Rc1
Queen's Gambit Declined: Orthodox Defense, Pillsbury Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 b6 8. cxd5 exd5 9. Bd3
Queen's Gambit Declined: Orthodox Defense, Main Line: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1
Queen's Gambit Declined: Orthodox Defense, Henneberger Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 a6
Queen's Gambit Declined: Orthodox Defense, Swiss, Carlsbad Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 a6 8. cxd5
Queen's Gambit Declined: Orthodox Defense, Main Line: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 c6
Queen's Gambit Declined: Orthodox Defense, Capablanca Variation: 1. Nf3 d5 2. d4 Nf6 3. c4 e6 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 b6 8. cxd5 exd5 9. Bb5

D64 QGD, Orthodox Defence, Rubinstein Attack (with Rc1)
Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack: 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Nf3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 c6 8. a3 a6 9. Qc2
Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 c6 8. Qc2
Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 c6 8. Qc2 a6
Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack: 1. Nf3 d5 2. d4 Nf6 3. c4 e6 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 c6 8. Qc2 Ne4

D65 QGD, Orthodox Defence, Rubinstein Attack, Main line
Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack: 1. d4 d5 2. Nf3 Nf6 3. c4 e6 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 c6 8. Qc2 a6 9. cxd5

D66 QGD, Orthodox Defence, Bd3 line including Rubinstein Trap
Queen's Gambit Declined: Orthodox Defense, Bd3 Line: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. Bd3
Queen's Gambit Declined: Orthodox Defense, Fianchetto Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c6 5. Nf3 Be7 6. e3 Nbd7 7. Rc1 O-O 8. Bd3 dxc4 9. Bxc4 b5

D67 QGD, Orthodox Defence, Bd3 line, Capablanca freeing manoeuvre
Queen's Gambit Declined: Orthodox Defense, Capablanca System: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. Bd3 dxc4 9. Bxc4 Nd5
Queen's Gambit Declined: Orthodox Defense, Bd3 Line: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7
Queen's Gambit Declined: Orthodox Defense, Alekhine Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. Ne4
Queen's Gambit Declined: Orthodox Defense, Main Line: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. O-O
Queen's Gambit Declined: Orthodox Defense, Janowski Variation: 1. d4 d5 2. Nf3 Nf6 3. c4 e6 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 c6 8. Bd3 dxc4 9. Bxc4 Nd5 10. h4

D68 QGD, Orthodox Defence, Classical Variation
Queen's Gambit Declined: Orthodox Defense, Classical Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. O-O Nxc3 12. Rxc3 e5
Queen's Gambit Declined: Orthodox Defense, Classical Variation: 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 c6 8. Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. O-O Nxc3 12. Rxc3 e5 13. Qb1
Queen's Gambit Declined: Orthodox Defense, Classical Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 c6 8. Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. O-O Nxc3 12. Rxc3 e5 13. Qc2

D69 QGD, Orthodox Defence, Classical, 13.dxe5
Queen's Gambit Declined: Orthodox Defense, Classical Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. O-O Nxc3 12. Rxc3 e5 13. dxe5 Nxe5 14. Nxe5 Qxe5

D70–D99

1.d4 Nf6 2.c4 g6 with 3...d5: Grünfeld Defence

D70 Neo-Grünfeld Defence
Neo-Grünfeld Defense: Goglidze Attack: 1. d4 Nf6 2. c4 g6 3. f3 d5
Neo-Grünfeld Defense: with g3: 1. d4 Nf6 2. c4 g6 3. g3 d5
Neo-Grünfeld Defense: with Nf3: 1. d4 Nf6 2. c4 g6 3. Nf3 d5

D71 Neo-Grünfeld, 5.cxd5
Neo-Grünfeld Defense: Exchange Variation: 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 d5 5. cxd5 Nxd5

D72 Neo-Grünfeld, 5.cxd5, Main line
1. d4 Nf6 2. c4 g6 3. g3 d5 4.Bg2 Bg7 5.cxd5

D73 Neo-Grünfeld, 5.Nf3
1. d4 Nf6 2. c4 g6 3. g3 d5 4.Bg2 Bg7 5.Nf3

D74 Neo-Grünfeld, 6.cxd5 Nxd5, 7.0-0
Neo-Grünfeld Defense: Delayed Exchange Variation: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d5 6. cxd5 Nxd5 7. O-O

D75 Neo-Grünfeld, 6.cxd5 Nxd5, 7.0-0 c5, 8.Nc3
Neo-Grünfeld Defense: Delayed Exchange Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 O-O 5. g3 d5 6. cxd5 Nxd5 7. Bg2 c5 8. O-O
Neo-Grünfeld Defense: Delayed Exchange Variation: 1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. g3 O-O 5. Bg2 d5 6. cxd5 Nxd5 7. O-O c5 8. dxc5

D76 Neo-Grünfeld, 6.cxd5 Nxd5, 7.0-0 Nb6
Neo-Grünfeld Defense: Delayed Exchange Variation: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d5 6. cxd5 Nxd5 7. O-O Nb6

D77 Neo-Grünfeld, 6.0-0
Neo-Grünfeld Defense: Classical Variation: 1. d4 Nf6 2. Nf3 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O d5 6. c4
Neo-Grünfeld Defense: Classical Variation, Modern Defense: 1. d4 Nf6 2. Nf3 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O d5 6. c4 dxc4
Neo-Grünfeld Defense: Classical Variation, Polgar Variation: 1. d4 Nf6 2. Nf3 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O d5 6. c4 Nc6

D78 Neo-Grünfeld, 6.0-0 c6
Neo-Grünfeld Defense: Classical Variation, Original Defense: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 c6 6. O-O d5

D79 Neo-Grünfeld, 6.0-0, Main line
Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 c6 6. O-O d5 7. cxd5 cxd5

D80 Grünfeld Defence
Grünfeld Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 d5
Grünfeld Defense: Stockholm Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bg5
Grünfeld Defense: Lundin Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bg5 Ne4 5. Nxe4 dxe4 6. Qd2 c5
Grünfeld Defense: Lutikov Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. f3
Grünfeld Defense: Lutikov Variation, Murrey Attack: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. f3 c5 5. cxd5 Nxd5 6. Na4
Grünfeld Defense: Gibbon Gambit: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. g4
Grünfeld Defense: Zaitsev Gambit: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. h4

D81 Grünfeld, Russian Variation
Grünfeld Defense: Russian Variation, Accelerated Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Qb3

D82 Grünfeld, 4.Bf4
Grünfeld Defense: Brinckmann Attack: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4

D83 Grünfeld Gambit
Grünfeld Defense: Brinckmann Attack, Grünfeld Gambit: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O
Grünfeld Defense: Brinckmann Attack, Grünfeld Gambit, Capablanca Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Rc1
Grünfeld Defense: Brinckmann Attack, Grünfeld Gambit, Botvinnik Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Rc1 c5 7. dxc5 Be6
Grünfeld Defense: Brinckmann Attack, Reshevsky Gambit: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. Rc1 O-O 6. e3 c5 7. dxc5 Qa5

D84 Grünfeld Gambit Accepted
Grünfeld Defense: Brinckmann Attack, Grünfeld Gambit Accepted: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. cxd5 Nxd5 7. Nxd5 Qxd5 8. Bxc7

D85 Grünfeld, Nadanian Variation
Grünfeld Defense: Exchange Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5
Grünfeld Defense: Exchange Variation, Modern Exchange Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Nf3
Grünfeld Defense: Exchange Variation, Modern Exchange Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Nf3 c5
Grünfeld Defense: Exchange Variation, Modern Exchange Variation, Pawn Grab Line: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Nf3 c5 8. Rb1 O-O 9. Be2 Nc6 10. d5 Bxc3+
Grünfeld Defense: Exchange Variation, Nadanian Attack: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. Na4
Grünfeld Defense: Exchange Variation, Modern Exchange Variation, Kramnik's Line: 1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 d5 5. cxd5 Nxd5 6. e4 Nxc3 7. bxc3 c5 8. h3
Grünfeld Defense: Exchange Variation, Modern Exchange Variation: 1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 d5 5. cxd5 Nxd5 6. e4 Nxc3 7. bxc3 c5 8. Rb1

D86 Grünfeld, Exchange, Classical Variation
Grünfeld Defense: Exchange Variation, Classical Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4
Grünfeld Defense: Exchange Variation, Simagin's Lesser Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 O-O 8. Ne2 b6
Grünfeld Defense: Exchange Variation, Simagin's Improved Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 O-O 8. Ne2 Nc6
Grünfeld Defense: Exchange Variation, Larsen Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 O-O 8. Ne2 Qd7
Grünfeld Defense: Exchange Variation, Larsen Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 O-O 8. Ne2 Qd7 9. O-O b6

D87 Grünfeld, Exchange, Spassky Variation
Grünfeld Defense: Exchange Variation, Seville Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 c5 8. Ne2 Nc6 9. Be3 O-O 10. O-O Bg4 11. f3 Na5 12. Bxf7+
Grünfeld Defense: Exchange Variation, Spassky Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 c5 8. Ne2 O-O

D88 Grünfeld, Spassky Variation, Main line, 10...cxd4, 11.cxd4
Grünfeld Defense: Exchange Variation, Spassky Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 c5 8. Ne2 Nc6 9. Be3 O-O 10. O-O cxd4 11. cxd4

D89 Grünfeld, Spassky Variation, Main line, 13.Bd3
Grünfeld Defense: Exchange Variation, Spassky Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 c5 8. Ne2 Nc6 9. Be3 O-O 10. O-O Bg4 11. f3 Na5 12. Bd3 cxd4 13. cxd4 Be6
Grünfeld Defense: Exchange Variation, Sokolsky Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 c5 8. Ne2 O-O 9. O-O Nc6 10. Be3 Bg4 11. f3 Na5 12. Bd3 cxd4 13. cxd4 Be6 14. d5

D90 Grünfeld, Three Knights Variation
Grünfeld Defense: Three Knights Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3
Grünfeld Defense: Three Knights Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7
Grünfeld Defense: Flohr Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qa4+

D91 Grünfeld, Three Knights Variation
Grünfeld Defense: Three Knights Variation, Petrosian System: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bg5

D92 Grünfeld, 5.Bf4
Grünfeld Defense: Three Knights Variation, Hungarian Attack: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4

D93 Grünfeld with 5.Bf4 0-0 6.e3
Grünfeld Defense: Three Knights Variation, Hungarian Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. e3

D94 Grünfeld, 5.e3
Grünfeld Defense: Flohr Defense: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 g6 5. Nf3 Bg7 6. Bd3 O-O 7. O-O Bf5
Grünfeld Defense: Smyslov Defense: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 g6 5. Nf3 Bg7 6. Bd3 O-O 7. O-O Bg4
Grünfeld Defense: Three Knights Variation, Burille Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3
Grünfeld Defense: Makogonov Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. b4
Grünfeld Defense: Opocensky Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. Bd2
Grünfeld Defense: Three Knights Variation, Paris Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. Bd3

D95 Grünfeld with 5.e3 0-0 6.Qb3
Grünfeld Defense: Pachman Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. e3 Bg7 5. Qb3 dxc4 6. Bxc4 O-O 7. Nf3 Nbd7 8. Ng5
Grünfeld Defense: Three Knights Variation, Vienna Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. Qb3
Grünfeld Defense: Botvinnik Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. Qb3 e6

D96 Grünfeld, Russian Variation
Grünfeld Defense: Russian Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3

D97 Grünfeld, Russian Variation with 7.e4
Grünfeld Defense: Russian Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4
Grünfeld Defense: Russian Variation, Hungarian Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 a6
Grünfeld Defense: Russian Variation, Levenfish Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 b6
Grünfeld Defense: Russian Variation, Szabo Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 c6
Grünfeld Defense: Russian Variation, Prins Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Na6
Grünfeld Defense: Russian Variation, Byrne Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Nc6

D98 Grünfeld, Russian, Smyslov Variation
Grünfeld Defense: Russian Variation, Smyslov Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Bg4
Grünfeld Defense: Russian Variation, Keres Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Bg4 8. Be3 Nfd7 9. Be2 Nb6 10. Qd3 Nc6 11. O-O-O

D99 Grünfeld Defence, Smyslov, Main line
Grünfeld Defense: Russian Variation, Smyslov Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Bg4 8. Be3 Nfd7 9. Qb3
Grünfeld Defense: Russian Variation, Yugoslav Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 O-O 7. e4 Bg4 8. Be3 Nfd7 9. Qb3 c5

E – Indian Defences

1.d4 Nf6 2.c4 e6: Indian systems with ...e6 (E00–E59)
1.d4 Nf6 2.c4 g6 without 3...d5: Indian systems with ...g6 (except Grünfeld) (E60–E99)

E00–E59

1.d4 Nf6 2.c4 e6: Indian systems with ...e6

E00 Queen's Pawn Game (including Neo-Indian Attack, Trompowsky Attack, Catalan Opening and others)
Indian Defense: Seirawan Attack: 1. d4 Nf6 2. c4 e6 3. Bg5
Catalan Opening: 1. d4 Nf6 2. c4 e6 3. g3
Catalan Opening: 1. d4 Nf6 2. c4 e6 3. g3 d5
Catalan Opening: Hungarian Gambit: 1. d4 Nf6 2. c4 e6 3. g3 e5
Indian Defense: Devin Gambit: 1. d4 Nf6 2. c4 e6 3. g4
Indian Defense: 1. d4 Nf6 2. c4 e6 3. Qb3

E01 Catalan, Closed
Catalan Opening: Closed: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2

E02 Catalan, Open, 5.Qa4
Catalan Opening: Open Defense: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4

E03 Catalan, Open, Alekhine Variation
Catalan Opening: Open Defense: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Qa4+ Nbd7 6. Qxc4
Catalan Opening: Open Defense, Alekhine Variation: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Qa4+ Nbd7 6. Qxc4 a6 7. Qc2

E04 Catalan, Open, 5.Nf3
Catalan Opening: Open Defense: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3
Catalan Opening: Open Defense, Modern Sharp Variation: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3 Nc6 6. Qa4 Bb4+

E05 Catalan, Open, Classical line
Catalan Opening: Open Defense, Classical Line: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3 Be7
Catalan Opening: Open Defense, Classical Line: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Be7 5. Bg2 O-O 6. O-O dxc4

E06 Catalan, Closed, 5.Nf3
Catalan Opening: Closed: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3
Catalan Opening: Closed: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O c6 7. Qc2 b6 8. Nbd2 Bb7 9. e4 Na6
Catalan Opening: Closed: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Bb4+ 5. Bd2 Be7 6. Bg2 O-O 7. O-O c6 8. Bf4 b6

E07 Catalan, Closed, 6...Nbd7
Catalan Opening: Closed: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7
Catalan Opening: Closed, Botvinnik Variation: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Nc3 c6 8. Qd3

E08 Catalan, Closed, 7.Qc2
Catalan Opening: Closed, Zagoryansky Variation: 1. d4 e6 2. c4 Nf6 3. Nf3 d5 4. g3 Be7 5. Bg2 O-O 6. O-O Nbd7 7. Qc2 c6 8. Rd1 b6 9. a4
Catalan Opening: Closed, Spassky Gambit: 1. d4 Nf6 2. c4 e6 3. g3 Be7 4. Bg2 d5 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8. b3 b6 9. Rd1 Bb7 10. Nc3 b5
Catalan Opening: Closed: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O c6 7. Qc2 b6 8. Rd1 Nbd7 9. Bf4
Catalan Opening: Closed: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2
Catalan Opening: Closed: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8. b3
Catalan Opening: Closed: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8. b3 b6
Catalan Opening: Closed: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8. Bf4 b6 9. Nbd2 Bb7 10. e4

E09 Catalan, Closed, Main line
Catalan Opening: Closed Variation, Rabinovich Variation: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Qc2 e6 5. Nbd2 Be7 6. g3 Nbd7 7. Bg2 O-O 8. O-O b5
Catalan Opening: Closed, Sokolsky Variation: 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8. Nbd2 b6 9. b3 a5 10. Bb2 Ba6
Catalan Opening: Closed, Main Line: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Be7 5. Bg2 O-O 6. O-O c6 7. Qc2 b6 8. Nbd2 Bb7 9. e4 Nbd7
Catalan Opening: Closed, Main Line: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Be7 5. Bg2 O-O 6. O-O Nbd7 7. Qc2 c6 8. Bf4 b6 9. Nbd2 Bb7 10. e4 dxe4 11. Nxe4 Nxe4 12. Qxe4
Catalan Opening: Closed, Main Line: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Be7 5. Bg2 O-O 6. O-O Nbd7 7. Qc2 c6 8. Nbd2
Catalan Opening: Closed Variation, Traditional Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Be7 5. Bg2 O-O 6. O-O Nbd7 7. Qc2 c6 8. Nbd2 b6

E10 Queen's Pawn Game 3.Nf3
Indian Defense: Anti-Nimzo-Indian: 1. d4 Nf6 2. c4 e6 3. Nf3
Indian Defense: Dzindzi-Indian Defense: 1. d4 Nf6 2. c4 e6 3. Nf3 a6
Blumenfeld Countergambit: 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5
Blumenfeld Countergambit: Duz-Khotimirsky Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5 5. Bg5
Blumenfeld Countergambit: Spielmann Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5 5. Bg5 exd5 6. cxd5 h6
Blumenfeld Countergambit Accepted: 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5 5. dxe6 fxe6 6. cxb5 d5
Indian Defense: Döry Indian: 1. d4 Nf6 2. c4 e6 3. Nf3 Ne4

E11 Bogo-Indian Defence
Bogo-Indian Defense: Retreat Variation: 1. d4 Nf6 2. c4 e6 3. g3 Bb4+ 4. Bd2 Be7 5. Bg2 d5 6. Nf3
Bogo-Indian Defense: Retreat Variation: 1. d4 Nf6 2. c4 e6 3. g3 Bb4+ 4. Bd2 Be7 5. Bg2 d5 6. Nf3 Nbd7 7. O-O O-O 8. Qc2 c6
Bogo-Indian Defense: Retreat Variation: 1. d4 Nf6 2. c4 e6 3. g3 Bb4+ 4. Bd2 Be7 5. Bg2 d5 6. Nf3 O-O
Bogo-Indian Defense: Retreat Variation: 1. d4 Nf6 2. c4 e6 3. g3 Bb4+ 4. Bd2 Be7 5. Bg2 d5 6. Nf3 O-O 7. O-O
Bogo-Indian Defense: Retreat Variation: 1. d4 Nf6 2. c4 e6 3. g3 Bb4+ 4. Bd2 Be7 5. Bg2 d5 6. Nf3 O-O 7. Qc2 c6 8. O-O
Bogo-Indian Defense: Monticelli Trap: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 O-O 8. Nc3 Ne4 9. Qc2 Nxc3 10. Ng5
Bogo-Indian Defense: 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+
Bogo-Indian Defense: Wade-Smyslov Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 a5
Bogo-Indian Defense: Retreat Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 Be7
Bogo-Indian Defense: Exchange Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 Bxd2+
Bogo-Indian Defense: Vitolins Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 c5
Bogo-Indian Defense: Haiti Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 Nc6
Bogo-Indian Defense: Nimzowitsch Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 Qe7
Bogo-Indian Defense: Grünfeld Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nbd2
Bogo-Indian Defense: New England Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nfd2
Bogo-Indian Defense: Retreat Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Bb4+ 5. Bd2 Be7 6. Bg2 O-O 7. O-O c6 8. Qc2 Nbd7 9. Bf4 b6 10. Nbd2
Bogo-Indian Defense: Retreat Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Bb4+ 5. Bd2 Be7 6. Bg2 O-O 7. O-O c6 8. Qc2 Nbd7 9. Bf4 b6 10. Nbd2 Ba6

E12 Queen's Indian Defence
Queen's Indian Defense: 1. d4 Nf6 2. c4 e6 3. Nf3 b6
Queen's Indian Defense: Petrosian Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3
Queen's Indian Defense: Petrosian Variation, Farago Defense: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Ba6 5. Qc2 Bb7
Queen's Indian Defense: Kasparov-Petrosian Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3
Queen's Indian Defense: Kasparov-Petrosian Variation, Marco Defense: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 Be7
Queen's Indian Defense: Kasparov-Petrosian Variation, Main Line: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5
Queen's Indian Defense: Kasparov-Petrosian Variation, Classical Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. cxd5 exd5
Queen's Indian Defense: Kasparov-Petrosian Variation, Modern Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. cxd5 Nxd5
Queen's Indian Defense: Kasparov-Petrosian Variation, Romanishin Attack: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. cxd5 Nxd5 7. Bd2
Queen's Indian Defense: Kasparov-Petrosian Variation, Petrosian Attack: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. cxd5 Nxd5 7. e3
Queen's Indian Defense: Kasparov-Petrosian Variation, Rashkovsky Attack: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. cxd5 Nxd5 7. Qa4+
Queen's Indian Defense: Kasparov-Petrosian Variation, Kasparov Attack: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. cxd5 Nxd5 7. Qc2
Queen's Indian Defense: Kasparov-Petrosian Variation, Hedgehog Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 g6
Queen's Indian Defense: Kasparov-Petrosian Variation, Andersson Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 Ne4
Queen's Indian Defense: Miles Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Bf4
Queen's Indian Defense: Kasparov Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3
Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb4
Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation, Modern Line: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb4 5. Bg5 Bb7 6. Nd2
Queen's Indian Defense: Kasparov-Petrosian Variation, Polovodin Gambit: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. a3 d5 6. cxd5 Nxd5 7. e4
Queen's Indian Defense: Kasparov Variation, Botvinnik Attack: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 h6 6. Bh4 g5 7. Bg3 Nh5

E13 Queen's Indian, 4.Nc3, Main line
Queen's Indian Defense: Kasparov Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb4 5. Bg5 h6 6. Bh4 Bb7

E14 Queen's Indian, 4.e3
Queen's Indian Defense: Spassky System: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. e3
Queen's Indian Defense: Averbakh Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. e3 Bb7 5. Bd3 c5 6. O-O Be7 7. b3 O-O 8. Bb2 cxd4 9. Nxd4

E15 Queen's Indian, 4.g3
Queen's Indian Defense: Fianchetto Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3
Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Ba6
Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation, Quiet Line: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Ba6 5. b3
Queen's Indian Defense: Fianchetto Variation, Check Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Ba6 5. b3 Bb4+
Queen's Indian Defense: Fianchetto Variation, Check Variation, Intermezzo Line: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Ba6 5. b3 Bb4+ 6. Bd2 Be7
Queen's Indian Defense: Fianchetto Variation, Check Variation, Modern Line: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Ba6 5. b3 Bb4+ 6. Bd2 Qe7
Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation, Nimzowitsch Attack: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Ba6 5. Qa4
Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation, Timman's Line: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Ba6 5. Qb3
Queen's Indian Defense: Fianchetto Variation, Traditional Line: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7
Queen's Indian Defense: Fianchetto Variation, Sämisch Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 c5
Queen's Indian Defense: Buerger Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 c5 6. d5 exd5 7. Ng5
Queen's Indian Defense: Fianchetto Variation, Rubinstein Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 c5 6. d5 exd5 7. Nh4

E16 Queen's Indian, Capablanca Variation
Queen's Indian Defense: Capablanca Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+
Queen's Indian Defense: Riumin Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Be7
Queen's Indian Defense: Yates Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 a5 5. g3 b6 6. Bg2 Bb7

E17 Queen's Indian, 5.Bg2 Be7
Queen's Indian Defense: Traditional Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7
Queen's Indian Defense: Anti-Queen's Indian System: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. Nc3
Queen's Indian Defense: Opocensky Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. Nc3 Ne4 7. Bd2
Queen's Indian Defense: Classical Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O
Queen's Indian Defense: Euwe Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. b3
Queen's Indian Defense: Classical Variation, Taimanov Gambit: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. d5 exd5 8. Nd4
Queen's Indian Defense: Classical Variation, Polugaevsky Gambit: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. d5 exd5 8. Nh4
Queen's Indian Defense: Fianchetto Variation, Kramnik Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Re1

E18 Queen's Indian, Old Main line, 7.Nc3
Queen's Indian Defense: Classical Variation, Traditional Variation: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3
Queen's Indian Defense: Classical Variation, Traditional Variation, Nimzowitsch Line: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3 d5
Queen's Indian Defense: Classical Variation, Tiviakov Defense: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3 Na6

E19 Queen's Indian, Old Main line, 9.Qxc3
Queen's Indian Defense: Classical Variation, Traditional Variation, Main Line: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3 Ne4 8. Qc2 Nxc3 9. Qxc3

E20 Nimzo-Indian Defence
Nimzo-Indian Defense: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4
Nimzo-Indian Defense: Kmoch Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3
Nimzo-Indian Defense: Romanishin Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. g3
Nimzo-Indian Defense: Romanishin Variation, English Hybrid: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. g3 cxd4 6. Nxd4 O-O 7. Bg2 d5 8. cxd5 Nxd5
Nimzo-Indian Defense: Romanishin Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. g3 O-O 6. Bg2
Nimzo-Indian Defense: Mikenas Attack: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qd3

E21 Nimzo-Indian, Three Knights Variation
Nimzo-Indian Defense: Three Knights Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3
Nimzo-Indian Defense: Three Knights Variation, Korchnoi Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. d5
Nimzo-Indian Defense: Three Knights Variation, Euwe Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. d5 Ne4
Nimzo-Indian Defense: Three Knights Variation, Shocron Gambit: 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nc3 c5 5. d5 b5

E22 Nimzo-Indian, Spielmann Variation
Nimzo-Indian Defense: Spielmann Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3

E23 Nimzo-Indian, Spielmann, 4...c5, 5.dxc5 Nc6
Nimzo-Indian Defense: Spielmann Variation, Romanovsky Gambit: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 c5 5. dxc5 Nc6
Nimzo-Indian Defense: Spielmann Variation, Stahlberg Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 c5 5. dxc5 Nc6 6. Nf3 Ne4 7. Bd2 Nxc5
Nimzo-Indian Defense: Spielmann Variation, Stahlberg Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 c5 5. dxc5 Nc6 6. Nf3 Ne4 7. Bd2 Nxc5 8. Qc2 f5 9. g3
Nimzo-Indian Defense: Spielmann Variation, Carlsbad Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qb3 c5 5. dxc5 Nc6 6. Nf3 Ne4 7. Bd2 Nxd2

E24 Nimzo-Indian, Sämisch Variation
Nimzo-Indian Defense: Sämisch Variation, Accelerated: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3
Nimzo-Indian Defense: Sämisch Variation, Botvinnik Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3 d5 5. a3 Bxc3+ 6. bxc3 c5 7. e3 O-O 8. cxd5 Nxd5

E25 Nimzo-Indian, Sämisch Variation, Keres Variation
Nimzo-Indian Defense: Sämisch Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3 d5 5. a3 Bxc3+ 6. bxc3 c5 7. cxd5
Nimzo-Indian Defense: Sämisch Variation, Keres Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3 d5 5. a3 Bxc3+ 6. bxc3 c5 7. cxd5 Nxd5 8. dxc5
Nimzo-Indian Defense: Sämisch Variation, Romanovsky Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3 d5 5. a3 Bxc3+ 6. bxc3 c5 7. cxd5 Nxd5 8. dxc5 f5

E26 Nimzo-Indian, Sämisch Variation, 4.a3 Bxc3+ 5.bxc3 c5 6.e3
Nimzo-Indian Defense: Sämisch Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. e3
Nimzo-Indian Defense: Sämisch Variation, O'Kelly Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. e3 b6

E27 Nimzo-Indian, Sämisch Variation, 5...0-0
Nimzo-Indian Defense: Sämisch Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 O-O

E28 Nimzo-Indian, Sämisch Variation, 6.e3
Nimzo-Indian Defense: Sämisch Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. a3 Bxc3+ 6. bxc3

E29 Nimzo-Indian, Sämisch Variation, Main line
Nimzo-Indian Defense: Sämisch Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 Nc6 6. a3 Bxc3+ 7. bxc3 O-O
Nimzo-Indian Defense: Sämisch Variation, Capablanca Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 Nc6 6. a3 Bxc3+ 7. bxc3 O-O 8. Ne2 b6 9. e4 Ne8

E30 Nimzo-Indian, Leningrad Variation,
Nimzo-Indian Defense: Leningrad Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5
Nimzo-Indian Defense: Leningrad Variation, Averbakh Gambit: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5 h6 5. Bh4 c5 6. d5 b5

E31 Nimzo-Indian, Leningrad Variation, Main line
Nimzo-Indian Defense: Leningrad Variation, Benoni Defense: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5 h6 5. Bh4 c5 6. d5 d6

E32 Nimzo-Indian, Classical Variation (4.Qc2)
Nimzo-Indian Defense: Classical Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2
Nimzo-Indian Defense: Classical Variation, Vitolins-Adorjan Gambit: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b5
Nimzo-Indian Defense: Classical Variation, Keres Defense: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6

E33 Nimzo-Indian, Classical Variation, 4...Nc6
Nimzo-Indian Defense: Classical Variation, Zurich Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 Nc6
Nimzo-Indian Defense: Classical Variation, Milner-Barry Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 Nc6 5. Nf3 d6

E34 Nimzo-Indian, Classical, Noa Variation (4...d5)
Nimzo-Indian Defense: Classical Variation, Noa Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5
Nimzo-Indian Defense: Classical Variation, Belyavsky Gambit: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. cxd5 Qxd5 6. Nf3 Qf5 7. Qd1 e5

E35 Nimzo-Indian, Classical, Noa Variation, 5.cxd5 exd5
Nimzo-Indian Defense: Classical Variation, Noa Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. cxd5 exd5

E36 Nimzo-Indian, Classical, Noa Variation, 5.a3
Nimzo-Indian Defense: Classical Variation, Noa Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3
Nimzo-Indian Defense: Classical Variation, Noa Variation, Botvinnik Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Nc6
Nimzo-Indian Defense: Classical Variation, Noa Variation, Main Line: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Ne4

E37 Nimzo-Indian, Classical, Noa Variation, Main line, 7.Qc2
Nimzo-Indian Defense: Classical Variation, Noa Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Ne4 7. Qc2
Nimzo-Indian Defense: Classical Variation, Noa Variation, San Remo Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Ne4 7. Qc2 Nc6 8. e3 e5

E38 Nimzo-Indian, Classical, 4...c5
Nimzo-Indian Defense: Classical Variation, Berlin Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5
Nimzo-Indian Defense: Classical Variation, Berlin Variation, Steiner Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 5. dxc5 Bxc3+

E39 Nimzo-Indian, Classical, Pirc Variation
Nimzo-Indian Defense: Classical Variation, Berlin Variation, Pirc Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 5. dxc5 O-O
Nimzo-Indian Defense: Classical Variation, Berlin Variation, Macieja System: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 5. dxc5 O-O 6. a3 Bxc5 7. Nf3 b6 8. Bf4

E40 Nimzo-Indian, 4.e3
Nimzo-Indian Defense: Normal Line: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3
Nimzo-Indian Defense: Normal Variation, Taimanov Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 Nc6

E41 Nimzo-Indian, 4.e3 c5 5.Bd3 Nc6 6.Nf3 Bxc3+ 7.bxc3 d6, Hübner Variation
Nimzo-Indian Defense: Hübner Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5
Nimzo-Indian Defense: Hübner Variation, Main Line: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 Nc6 6. Nf3 Bxc3+ 7. bxc3 d6
Nimzo-Indian Defense: Normal Variation, Hübner Deferred: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Nf3 O-O

E42 Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein)
Nimzo-Indian Defense: Hübner Variation, Rubinstein Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Ne2
Nimzo-Indian Defense: Hübner Variation, Rubinstein Variation, Main Line: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Ne2 cxd4 6. exd4 O-O 7. a3
Nimzo-Indian Defense: Hübner Variation, Rubinstein Variation, Sherbakov Attack: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Ne2 cxd4 6. exd4 O-O 7. c5

E43 Nimzo-Indian, Fischer Variation
Nimzo-Indian Defense: St. Petersburg Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6
Nimzo-Indian Defense: St. Petersburg Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Bd3 Bb7 6. Nf3
Nimzo-Indian Defense: St. Petersburg Variation, with Ne4: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Bd3 Bb7 6. Nf3 Ne4
Nimzo-Indian Defense: St. Petersburg Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Bd3 Bb7 6. Nf3 O-O
Nimzo-Indian Defense: St. Petersburg Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Bd3 Bb7 6. Nf3 O-O 7. O-O
Nimzo-Indian Defense: St. Petersburg Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Bd3 Bb7 6. Nf3 O-O 7. O-O c5
Nimzo-Indian Defense: St. Petersburg Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Bd3 Bb7 6. Nf3 O-O 7. O-O c5 8. Na4 cxd4 9. a3 Be7
Nimzo-Indian Defense: St. Petersburg Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 Ne4 5. Qc2 f5 6. Nf3 b6 7. Bd3 Bb7
Nimzo-Indian Defense: St. Petersburg Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 c5 6. Nf3 b6 7. O-O Bb7 8. Na4 Qe7
Nimzo-Indian Defense: St. Petersburg Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 b6 5. e3 Ne4 6. Qc2
Nimzo-Indian Defense: St. Petersburg Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 b6 5. e3 Ne4 6. Qc2 Bb7 7. Bd3 Bxc3+ 8. bxc3 f5 9. O-O
Nimzo-Indian Defense: St. Petersburg Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Bxc3+ 5. bxc3 b6 6. e3 Bb7 7. Bd3 O-O 8. O-O

E44 Nimzo-Indian, Fischer Variation, 5.Ne2
Nimzo-Indian Defense: Fischer Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Ne2

E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation
Nimzo-Indian Defense: Normal Variation, Bronstein (Byrne) Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Ne2 Ba6

E46 Nimzo-Indian, 4.e3 0-0
Nimzo-Indian Defense: Normal Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O
Nimzo-Indian Defense: Reshevsky Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Ne2
Nimzo-Indian Defense: Simagin Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Ne2 d5 6. a3 Bd6

E47 Nimzo-Indian, 4.e3 0-0, 5.Bd3
Nimzo-Indian Defense: Normal Variation, Bishop Attack: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3

E48 Nimzo-Indian, 4.e3 0-0, 5.Bd3 d5
Nimzo-Indian Defense: Normal Variation, Bishop Attack, Classical Defense: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5
Nimzo-Indian Defense: Ragozin Defense: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 Nc6 7. O-O

E49 Nimzo-Indian, 4.e3, Botvinnik System
Nimzo-Indian Defense: Normal Variation, Botvinnik System: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. a3 Bxc3+ 7. bxc3

E50 Nimzo-Indian, 4.e3 0-0, 5.Nf3, without ...d5
Nimzo-Indian Defense: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3

E51 Nimzo-Indian, 4.e3 0-0, 5.Nf3 d5
Nimzo-Indian Defense: Ragozin Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 Nc6 7. O-O dxc4
Nimzo-Indian Defense: Normal Variation, Ragozin Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5
Nimzo-Indian Defense: Normal Variation, Sämisch Deferred: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. a3

E52 Nimzo-Indian, 4.e3, Main line with ...b6
Nimzo-Indian Defense: Normal Variation, Schlechter Defense: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Bd3 Bb7 6. Nf3 O-O 7. O-O d5
Nimzo-Indian Defense: Normal Variation, Schlechter Defense: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 b6

E53 Nimzo-Indian, 4.e3, Main line with ...c5
Nimzo-Indian Defense: Normal Variation, Gligoric System: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5
Nimzo-Indian Defense: Normal Variation, Gligoric System, Keres Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O b6
Nimzo-Indian Defense: Normal Variation, Gligoric System: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O Nbd7

E54 Nimzo-Indian, 4.e3, Gligoric System with 7...dxc4
Nimzo-Indian Defense: Normal Variation, Gligoric System, Exchange Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O dxc4 8. Bxc4
Nimzo-Indian Defense: Normal Variation, Gligoric System, Smyslov Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O dxc4 8. Bxc4 Qe7

E55 Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation
Nimzo-Indian Defense: Normal Variation, Gligoric System, Bronstein Variation: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O dxc4 8. Bxc4 Nbd7

E56 Nimzo-Indian, 4.e3, Main line with 7...Nc6
Nimzo-Indian Defense: Normal Variation, Gligoric System, Bernstein Defense: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O Nc6

E57 Nimzo-Indian, 4.e3, Main line with 8...dxc4 and 9...Bxc4 cxd4
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Bd3 c5 7. O-O Nc6 8. a3 dxc4 9. Bxc4 cxd4

E58 Nimzo-Indian, 4.e3, Main line with 8...Bxc3
Nimzo-Indian Defense: Normal Variation, Bernstein Defense, Exchange Line: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O Nc6 8. a3 Bxc3 9. bxc3

E59 Nimzo-Indian, 4.e3, Main line
Nimzo-Indian Defense: Normal Variation, Bernstein Defense: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O Nc6 8. a3 Bxc3 9. bxc3 dxc4 10. Bxc4

E60–E99

1.d4 Nf6 2.c4 g6 without 3...d5: Indian systems with ...g6 (except Grünfeld)

E60 King's Indian Defence
Indian Defense: West Indian Defense: 1. d4 Nf6 2. c4 g6
Indian Defense: Anti-Grünfeld, Advance Variation: 1. d4 Nf6 2. c4 g6 3. d5
Indian Defense: Anti-Grünfeld, Adorjan Gambit: 1. d4 Nf6 2. c4 g6 3. d5 b5
Indian Defense: Anti-Grünfeld, Alekhine Variation: 1. d4 Nf6 2. c4 g6 3. f3
Indian Defense: Anti-Grünfeld, Alekhine Variation, Leko Gambit: 1. d4 Nf6 2. c4 g6 3. f3 e5
King's Indian Defense: Fianchetto Variation, Immediate Fianchetto: 1. d4 Nf6 2. c4 g6 3. g3
Indian Defense: King's Indian Variation, Fianchetto Variation: 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2
Grünfeld Defense: Counterthrust Variation: 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 d5
Indian Defense: Anti-Grünfeld, Basman-Williams Attack: 1. d4 Nf6 2. c4 g6 3. h4
King's Indian Defense: Semi-Classical Variation, Benoni Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 O-O 5. e3 d6 6. Be2 c6
King's Indian Defense: Santasiere Variation: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. b4
Queen's Pawn, Mengarini Attack: 1. d4 Nf6 2. c4 g6 3. Qc2
King's Indian Defense: Normal Variation, King's Knight Variation: 1. d4 Nf6 2. Nf3 g6 3. c4
King's Indian Defense: Semi-Classical Variation, Hollywood Variation: 1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 O-O 5. e3 d6 6. Be2 Nc6

E61 King's Indian Defence, 3.Nc3
King's Indian Defense: 1. d4 Nf6 2. c4 g6 3. Nc3
King's Indian Defense: Smyslov Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. Bg5
King's Indian Defense: Fianchetto Variation, Benjamin Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 c6 7. O-O Qb6
King's Indian Defense: Semi-Classical Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 O-O 5. e3 d6 6. Be2
King's Indian Defense: Semi-Classical Variation, Queenside Storm Line: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 O-O 5. e3 d6 6. Be2 Nbd7 7. O-O e5 8. b4
King's Indian Defense: Semi-Classical Variation, Exchange Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 O-O 5. e3 d6 6. Be2 Nbd7 7. O-O e5 8. dxe5 dxe5

E62 King's Indian, Fianchetto Variation
King's Indian Defense: Fianchetto Variation, Carlsbad Variation: 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nc3 d6 6. Nf3 Nc6
King's Indian Defense: Fianchetto Variation, Lesser Simagin (Spassky): 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nc3 d6 6. Nf3 Nc6 7. O-O Bf5
King's Indian Defense: Fianchetto Variation, Delayed Fianchetto: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3
King's Indian Defense: Fianchetto Variation, Larsen Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 c6 7. O-O Bf5
King's Indian Defense: Fianchetto Variation, Simagin Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nc6 7. O-O Bg4
King's Indian Defense: Fianchetto Variation, Kavalek Defense: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O c6 7. Nc3 Qa5
King's Indian Defense: Fianchetto Variation, Uhlmann-Szabo System: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O Nc6 7. Nc3 e5

E63 King's Indian, Fianchetto, Panno Variation
King's Indian Defense: Fianchetto Variation, Panno Variation: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O Nc6 7. Nc3 a6
King's Indian Defense: Fianchetto Variation, Panno Variation, Blockade Line: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O Nc6 7. Nc3 a6 8. d5 Na5 9. Nd2 c5 10. Qc2 e5
King's Indian Defense: Fianchetto Variation, Panno Variation, Donner Line: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O Nc6 7. Nc3 a6 8. d5 Na5 9. Nd2 c5 10. Qc2 Rb8 11. b3 b5 12. Bb2 bxc4 13. bxc4 Bh6
King's Indian Defense: Fianchetto Variation, Panno Variation, Korchnoi Line: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O Nc6 7. Nc3 a6 8. h3 Rb8 9. Be3 b5 10. Nd2

E64 King's Indian, Fianchetto, Yugoslav System
King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Rare Line: 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nc3 d6 6. Nf3 c5
King's Indian Defense: Fianchetto Variation, Pterodactyl Variation: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 c5 5. Bg2 Qa5+
King's Indian Defense: Fianchetto Variation, Yugoslav System: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 d6 5. Bg2 O-O 6. O-O c5
King's Indian Defense: Fianchetto Variation, Hungarian Variation: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 d6 5. Bg2 O-O 6. O-O Nbd7 7. Nc3 a6
King's Indian Defense: Fianchetto Variation, Double Fianchetto Attack: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 d6 5. Bg2 O-O 6. O-O Nbd7 7. Nc3 e5 8. b3

E65 King's Indian, Yugoslav, 7.0-0
King's Indian Defense: Fianchetto Variation, Yugoslav Variation: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O c5 7. Nc3
King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Exchange Line: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O c5 7. Nc3 Nc6 8. dxc5 dxc5

E66 King's Indian, Fianchetto, Yugoslav Panno
King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Advance Line: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O c5 7. Nc3 Nc6 8. d5

E67 King's Indian, Fianchetto with ...Nd7
King's Indian Defense: Fianchetto Variation, Debrecen Defense: 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nc3 d6 6. Nf3 Nbd7
King's Indian Defense: Fianchetto Variation, Classical Fianchetto: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O Nbd7 7. Nc3 e5

E68 King's Indian, Fianchetto, Classical Variation, 8.e4
King's Indian Defense: Fianchetto Variation, Long Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 d6 5. g3 O-O 6. Bg2 Nbd7 7. O-O e5 8. e4 Re8 9. h3 exd4 10. Nxd4 Nc5 11. Re1 a5
King's Indian Defense: Fianchetto Variation, Classical Variation: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O Nbd7 7. Nc3 e5 8. e4

E69 King's Indian, Fianchetto, Classical Main line
King's Indian Defense: Fianchetto Variation, Classical Main Line: 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O Nbd7 7. Nc3 e5 8. e4 c6 9. h3

E70 King's Indian, 4.e4
King's Indian Defense: Normal Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4
King's Indian Defense: Normal Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6
King's Indian Defense: Accelerated Averbakh Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Bg5
King's Indian Defense: Kramer Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nge2

E71 King's Indian, Makogonov System (5.h3)
King's Indian Defense: Makogonov Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. h3

E72 King's Indian with e4 and g3
King's Indian Defense: Normal Variation, Deferred Fianchetto: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. g3
King's Indian Defense: Pomar System: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. g3 O-O 6. Bg2 e5 7. Nge2

E73 King's Indian, 5.Be2
King's Indian Defense: Normal Variation, Standard Development: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2
King's Indian Defense: Semi-Averbakh System: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Be3
King's Indian Defense: Averbakh Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5
King's Indian Defense: Averbakh Variation, Spanish Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 a6
King's Indian Defense: Averbakh Variation, Flexible Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 h6
King's Indian Defense: Averbakh Variation, Modern Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 Na6
King's Indian Defense: Averbakh Variation, Modern Defense, Burgess Line: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 Na6 7. Qd2 c6
King's Indian Defense: Averbakh Variation, Geller Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 Nbd7
King's Indian Defense: Averbakh Variation, Nc6 Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 Nc6

E74 King's Indian, Averbakh, 6...c5
King's Indian Defense: Averbakh Variation, Benoni Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 c5
King's Indian Defense: Averbakh Variation, Benoni Defense, Advance Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 c5 7. d5
King's Indian Defense: Averbakh Variation, Benoni Defense, Exchange Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 c5 7. dxc5

E75 King's Indian, Averbakh, Main line
King's Indian Defense: Averbakh Variation, Main Line: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 c5 7. d5 e6

E76 King's Indian, Four Pawns Attack
King's Indian Defense: Four Pawns Attack: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4
King's Indian Defense: Four Pawns Attack, Modern Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 Na6
King's Indian Defense: Four Pawns Attack, Dynamic Attack: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Nf3 c5 7. d5

E77 King's Indian, Four Pawns Attack, 6.Be2
King's Indian Defense: Four Pawns Attack: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. f4
King's Indian Defense: Six Pawns Attack: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Be2 c5 7. d5 e6 8. dxe6 fxe6 9. g4 Nc6 10. h4
King's Indian Defense: Four Pawns Attack, Normal Attack: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Nf3 c5 7. d5 e6 8. Be2
King's Indian Defense: Four Pawns Attack, Florentine Gambit: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Nf3 c5 7. d5 e6 8. Be2 exd5 9. e5

E78 King's Indian, Four Pawns Attack, with Be2 and Nf3
King's Indian Defense: Four Pawns Attack, Fluid Attack: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Nf3 c5 7. Be2

E79 King's Indian, Four Pawns Attack, Main line
King's Indian Defense: Four Pawns Attack, Exchange Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 O-O 6. Nf3 c5 7. Be2 cxd4 8. Nxd4 Nc6 9. Be3

E80 King's Indian, Sämisch Variation
King's Indian Defense: Sämisch Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3

E81 King's Indian, Sämisch, 5...0-0
King's Indian Defense: Sämisch Variation, Normal Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O
King's Indian Defense: Sämisch Variation, Sämisch Gambit: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 c5
King's Indian Defense: Sämisch Variation, Byrne Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 c6 7. Bd3 a6
King's Indian Defense: Steiner Attack: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Bg5
King's Indian Defense: Sämisch Variation, Bobotsov-Korchnoi-Petrosian Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Nge2

E82 King's Indian, Sämisch, Double Fianchetto Variation
King's Indian Defense: Sämisch Variation, Double Fianchetto: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 b6

E83 King's Indian, Sämisch, 6...Nc6 (Panno Variation)
King's Indian Defense: Sämisch Variation, Yates Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 Nc6
King's Indian Defense: Sämisch Variation, Panno Formation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 Nc6 7. Nge2 a6
King's Indian Defense: Sämisch Variation, Ruban Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 Nc6 7. Nge2 Rb8

E84 King's Indian, Sämisch, Panno Main line
King's Indian Defense: Sämisch Variation, Panno Main Line: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 Nc6 7. Nge2 a6 8. Qd2 Rb8

E85 King's Indian, Sämisch, Orthodox Variation
King's Indian Defense: Sämisch Variation, Orthodox Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5

E86 King's Indian, Sämisch, Orthodox, 7.Nge2 c6
King's Indian Defense: Sämisch Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. Nge2 c6

E87 King's Indian, Sämisch, Orthodox, 7.d5
King's Indian Defense: Sämisch Variation, Closed Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. d5
King's Indian Defense: Sämisch Variation, Bronstein Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. d5 Nh5 8. Qd2 Qh4+ 9. g3 Nxg3 10. Qf2 Nxf1 11. Qxh4 Nxe3 12. Ke2
King's Indian Defense: Sämisch Variation, Orthodox Variation, Bronstein Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. d5 Nh5 8. Qd2 Qh4+ 9. g3 Nxg3 10. Qf2 Nxf1 11. Qxh4 Nxe3 12. Ke2 Nxc4

E88 King's Indian, Sämisch, Orthodox, 7.d5 c6
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. d5 c6

E89 King's Indian, Sämisch, Orthodox Main line
King's Indian Defense: Sämisch Variation, Closed Variation, Main Line: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. Nge2 c6 8. d5 cxd5

E90 King's Indian, 5.Nf3
King's Indian Defense: Normal Variation, Rare Defenses: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3
King's Indian Defense: Larsen Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be3
King's Indian Defense: Zinnowitz Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Bg5

E91 King's Indian, 6.Be2
King's Indian Defense: Orthodox Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2
King's Indian Defense: Kazakh Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 Na6

E92 King's Indian, Classical Variation
King's Indian Defense: Orthodox Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5
King's Indian Defense: Orthodox Variation, Gligoric-Taimanov System: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. Be3
King's Indian Defense: Petrosian Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5
King's Indian Defense: Petrosian Variation, Stein Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5 a5
King's Indian Defense: Exchange Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. dxe5

E93 King's Indian, Petrosian System, Main line
King's Indian Defense: Petrosian Variation, Normal Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5 Nbd7
King's Indian Defense: Petrosian Variation, Keres Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5 Nbd7 8. Bg5 h6 9. Bh4 g5 10. Bg3 Nh5 11. h4

E94 King's Indian, Orthodox Variation
King's Indian Defense: Orthodox Variation, Positional Defense: 1. d4 Nf6 2. c4 d6 3. Nc3 Nbd7 4. e4 e5 5. Nf3 g6 6. Be2 Bg7 7. O-O O-O
King's Indian Defense: Orthodox Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O
King's Indian Defense: Orthodox Variation, Ukrainian Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O a5
King's Indian Defense: Orthodox Variation, Donner Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O c6
King's Indian Defense: Orthodox Variation, Glek Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Na6
King's Indian Defense: Orthodox Variation, Positional Defense, Closed Line: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 Nbd7 7. O-O e5 8. d5

E95 King's Indian, Orthodox, 7...Nbd7, 8.Re1
King's Indian Defense: Orthodox Variation: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nbd7 8. Re1

E96 King's Indian, Orthodox, 7...Nbd7, Main line
King's Indian Defense: Orthodox Variation, Positional Defense, Main Line: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nbd7 8. Re1 c6 9. Bf1 a5

E97 King's Indian, Orthodox, Aronin–Taimanov Variation (Yugoslav Attack / Mar del Plata Variation)
King's Indian Defense: Orthodox Variation, Aronin-Taimanov Defense: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6
King's Indian Defense: Orthodox Variation, Bayonet Attack: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. b4
King's Indian Defense: Orthodox Variation, Bayonet Attack, Yepishin's Line: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. b4 Nh5 10. Qc2
King's Indian Defense: Orthodox Variation, Bayonet Attack, Sokolov's Line: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. b4 Nh5 10. Re1
King's Indian Defense: Orthodox Variation, Korchnoi Attack: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. Bd2
King's Indian Defense: Orthodox Variation, Modern System: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. Nd2

E98 King's Indian, Orthodox, Aronin–Taimanov, 9.Ne1
King's Indian Defense: Orthodox Variation, Classical System: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. Ne1
King's Indian Defense: Orthodox Variation, Classical System, Neo-Classical Line: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. Ne1 Nd7 10. Be3
King's Indian Defense: Orthodox Variation, Classical System, Kozul Gambit: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. Ne1 Nd7 10. Be3 f5 11. f3 f4 12. Bf2 g5 13. Rc1 Ng6 14. c5

E99 King's Indian, Orthodox, Aronin–Taimanov, Defence
King's Indian Defense: Orthodox Variation, Classical System, Traditional Line: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. Ne1 Nd7 10. f3 f5
King's Indian Defense: Orthodox Variation, Classical System, Benko Attack: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. Ne1 Nd7 10. f3 f5 11. g4

Statistics

Moves	1800–1900	1901–1935	1935–1998
1. e4 e5	63%	31%	15%
1. e4 other	23%	20%	35%
1. d4 d5	10%	28%	15%
1. d4 other	3%	16%	23%
1. other	3%	5%	12%

These statistics show a movement away from symmetrical defences to asymmetrical defences. In particular, in reply to 1.e4, the Sicilian and French defences, and to 1.d4 the Indian defences. Also, particularly amongst strong players, an increased use of the English Opening for White.^[1]

References

^ Watson, John (1998), Secrets of modern chess strategy (Part 2: New ideas and the modern revolution), London: Gambit, p. 93

External links

Opening theory in chess at Wikibooks

[1] Watson, John (1998), Secrets of modern chess strategy (Part 2: New ideas and the modern revolution), London: Gambit, p. 93

[1]