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. 24 No. 4, Mazurka in B♭ minor
According to the principles governing use of cautionary accidentals that we have adopted, the 
before g flat in the 3rd chord is unnecessary. The reason why Chopin put it in A (→GE→FE→EE) was probably the non-typical chord orthography that may bring associations with the diminished triad g - c sharp1- e1. Chopin introduced that enharmonically changed notation in the last phase of writing A, which is testified by the visible deletion of the chord originally written as the previous one.
Compare the passage in the sources »
category imprint: Corrections & alterations; Source & stylistic information
issues: Corrections in A, Cautionary accidentals, Enharmonic corrections
notation: Pitch
