Issues : Last key signature sign

b. 22

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

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GC and FE1 (→FE2FE3) do not include naturals before the octave on the 4th quaver of the bar. The flats before g2 and g1 in the 2nd half of the bar prove Chopin's oversight. The naturals were added in GE and EE, as well as in FE4.

category imprint: Differences between sources

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

b. 29

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

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In all sources, a cautionary  next to the g (L.H.) was added. We omit this superfluous accidental in the main text. 

category imprint: Editorial revisions

issues: Cautionary accidentals , Last key signature sign

b. 37

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

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GC (→GE) has a cautionary  before the minim g2. The missing sign in FE (→EE) could be an oversight by the engraver. However, the sign is superfluous here and we do not include it in the main text.

category imprint: Differences between sources

issues: Inaccuracies in FE , Cautionary accidentals , Last key signature sign

b. 79

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

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In [A] (→GC,FEEE1) in the 2nd half of the bar there were no accidentals, which gives g in the L.H. and g1(2) in the R.H. Chopin's mistake was corrected in GE (partially – only a  before g2 in the 4th crotchet) and in EE2.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Omissions to cancel alteration , GE revisions , Last key signature sign