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Pitch

b. 151-152

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

g2 & g1 in GC (→GE) & FE (→EE1)

g2 & g1 in EE2

g2 & g1 suggested by the editors

..

The naturals raising g2 to g2 and g1 to g1 are certainly an arbitrary addition of the reviser of EE2, who perhaps considered the natural character of the piano grip, since in terms of style, there is no reason to assume here an oversight of the naturals by Chopin.
In the main text we add a cautionary  before g2 in bar 151.

category imprint: Differences between sources

issues: EE revisions

b. 151-152

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

..

In the 2nd half of each of these bars, GC and FE1 (→FE2FE3) have no naturals. The necessary signs – before a1 and a – were added in GE, FE4 and EE (in EE1 only in bar 152).

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , Inaccuracies in FE , GE revisions , EE inaccuracies , Inaccuracies in GC

b. 155

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

e2 in GC (→GE)

c2 in FE (→EE), contextual interpretation

..

The structure of the figuration in the entire passage in the L.H. (bars 153-156 and 157-160), and particularly the comparison with analogous bar 159, indicate a mistake of the copyist in this place. The absence of a correction in GE may be attributed to the absent  before this note (although in a similar situation four bars later, a  before the respective note – c2 – was added). The sign is absent also in the majority of the sources featuring the note at the correct pitch – it was added only in EE2

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , Terzverschreibung error , Errors of GC

b. 155

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

g2-b2 in FE1 (→FE2EE1)

f2-b2 in GC (→GE), FE3 (→FE4) & EE2

..

g2 instead of f2 at the last quaver of the bar is certainly a mistake of Chopin in [A]. It is proved by the  before the note, present both in FE1 (→FE2) and GC, which originally also included g2. Chopin corrected the mistake in GC and the proofreading of FE3 (→FE4). The erroneous version was passed down to EE1, in which it was revised, by deleting the , which was superfluous before g2.

category imprint: Differences between sources; Corrections & alterations

issues: Errors in FE , Inaccurate note pitch in A , Authentic corrections of FE , Authentic corrections in GC

b. 155

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

e2-g2 in GC (→GE) & FE2 (→EE,FE3FE4)

g2-b2 in FE1

..

The characteristic, Terzverschreibung mistake of FE1 was corrected already in FE2.

category imprint: Differences between sources

issues: Errors in FE , Terzverschreibung error , FE revisions