Op. 2, Variations in B♭ major
Op. 10, 12 Etudes
Op. 11, Concerto in E minor
Op. 21, Concerto in F minor
Op. 22, Polonaise in E♭ major
Op. 24, 4 Mazurkas
Op. 25, 12 Etudes
Op. 26, 2 Polonaises
Op. 27, 2 Nocturnes
Op. 28, 24 Preludes
Op. 30, 4 Mazurkas
Op. 35, Sonata in B♭ minor
Op. 50, 3 Mazurkas
Op. 63, 3 Mazurkas
Op. 64, 3 Waltzes
Op. 28 No. 23, Prelude in F major
Thanks to the crossings-out and added notes in b. 2 and 6 visible in A, we can reconstruct the initial version of the last beat of these bars as 
and 
. The idea of changing it probably arose when Chopin was writing b. 6; afterwards, he introduced a respective correction in b. 2. It is proven by the notation of an analogous figure in b. 10, in which the final version was written right away, without corrections.
Compare the passage in the sources »
category imprint: Corrections & alterations; Source & stylistic information
issues: Corrections in A, Deletions in A, Main-line changes
notation: Pitch