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. 2, Variations, complete
The cautionary natural specifying the sound of the 2nd semiquaver was added in the stage of proofreading FE1 (→FE2), probably at Chopin's request. It is worth noting that it was only in the editions that a clear need for this accidental manifested itself, in which the last semiquaver in the previous bar is provided with a flat – in A there is no accidental to any of these notes.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Cautionary accidentals, Authentic corrections of FE
notation: Pitch