There are at least eight mazurkas by Chopin without opus number, usually designated as Op. posth., though at least four of these were published in his lifetime.
2 mazurkas in B♭ major and G major were composed and published in 1826 in revised versions; the originals were published in 1875. B. 16
D major, B. 31 (1829); revised version, B. 71 (1832)
B♭ major (Wolowska), B. 73 (1832) – dedicated to Alexandrine Wolowska
A minor (Notre Temps), B.134 (1840) – published (1841) in the collection "Six morceaux de salon", issued by the magazine Notre Temps along with works by Thalberg, Czerny and others.[1][2]
A minor (À Émile Gaillard), B.140 (1840) – published (1841) in "Album de pianistes polonais". Dedicated to Émile Gaillard.[3]