Issues : Last key signature sign

b. 148-152

composition: Op. 35, Sonata in B♭ minor, Mvt II

..

In the sources based directly on [A] – GC and FE1 (→FE2FE3,EE1) – four naturals raising c1 to c1, in bars 148-149 and 151-152, are missing. These patent inaccuracies were corrected in GE, FE4 and EE2

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors in FE , Errors in EE , GE revisions , Omission of current key accidentals , FE revisions , Last key signature sign , Errors of GC

b. 245

composition: Op. 35, Sonata in B♭ minor, Mvt II

Chord with c2 in GC & FE1 (→FE2EE1)

Chord with c2 in GE, FE3 (→FE4) & EE2

..

The chord with c2 is most probably a result of an oversight of the composer, which is confirmed by the  added – probably by Chopin – in FE3 (→FE4).

category imprint: Interpretations within context; Differences between sources; Corrections & alterations

issues: EE revisions , Errors in FE , GE revisions , Omission of current key accidentals , Authentic corrections of FE , Last key signature sign