A comparison with analogous b. 16 reveals that the b1 note present in the manuscripts and editions is probably Chopin's lapsus calami – he wrote here a note that was supposed to be in the next chord (cf., the Ballades in G Minor, Op. 23, b. 193 and in F Major, Op. 38, b. 173). Due to the above reason, we consider the correction of that note in FES to a1 (definitely coming from Chopin) to be a correction of the mistake and include it in the main text.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: Annotations in teaching copies, Errors of A, Annotations in FES
notation: Pitch