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b. 155

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

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There is no accidental before the top note of the 2nd quaver in GC and FE1 (→FE2FE3). The patent inaccuracy was corrected in the remaining sources.

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves , Inaccuracies in FE , FE revisions , Inaccuracies in GC

b. 156

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

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At the beginning of the 2nd half of the bar before the bottom note of the second, GC and FE1 (→FE2) have one  before each of the notes instead of . This easy to detect mistake – none of these flats is necessary at this pitch, whereas a1 appears in the part of the L.H. – was corrected in GE, by adding another  before the bottom note. The correct notation is included in FE3 (→FE4) and EE, which in both cases could have been a result of Chopin's intervention.
A double flat before the top note of the penultimate chord was added only in GE and EE2.

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

issues: EE revisions , Errors in FE , Accidentals in different octaves , GE revisions , Authentic corrections of FE , Errors of GC , Authentic corrections of EE

b. 159

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

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In GC and FE (→EE1) there is no flat lowering c2 to c2 in the L.H. The obvious inaccuracy was corrected in GE & EE2.

category imprint: Differences between sources

issues: EE revisions , Accidentals in different octaves , GE revisions , Errors of GC , Errors repeated in FE , Errors repeated in EE

b. 161

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

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The cautionary signs next to c3e3 and c were added by us. In turn, the flats before g and g1 are present in all sources.

category imprint: Editorial revisions

b. 161

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

Third in GC (→GE) & FE2 (→EE,FE3FE4)

Octave in FE1

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The version of FE1 is most probably a mistake (corrected in FE2 and subsequent FE), as in GC one can see no traces of corrections in this place.

category imprint: Differences between sources

issues: Errors in FE , FE revisions