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b. 87-88

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

3  signs in GC, FE (→EE) and GE2

No signs in GE2

..

The missing signs in GE1 are probably an oversight by the engraver, corrected in GE2.

category imprint: Differences between sources

issues: Long accents , Errors in GE , GE revisions

b. 89

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

Regular slurs in #KG & FE (→EE)

Irregular slurs in GE

..

The slurs of GE are certainly erroneous.

category imprint: Differences between sources

issues: Errors in GE

b. 89

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

No indication in GC (→GE) & FE1 (→FE2EE1)

cresc. - - in FE3 (→FE4)

cresc. in EE2

..

Same as  in bar 85cresc. - - in bars 89-90 was added in the proofreading of FE3 (→FE4), almost certainly by Chopin. The indication was repeated in EE2, yet without the dashes marking its range. 

category imprint: Differences between sources; Corrections & alterations

issues: EE revisions , Authentic corrections of FE

b. 89

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

..

When interpreted literally, the last chord's 2nd note from top in GE1 is a d2, which is a patent mistake with respect to the d1 note played simultaneously in the L.H. The regular structure of the three-chord motifs points to a Terzverschreibung, and not to an oversight of a . This is how it was corrected in GE2, i.e. to b1.

category imprint: Interpretations within context; Differences between sources

issues: Errors in GE , Terzverschreibung error , GE revisions

b. 90

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

..

The notation of accidentals is inaccurate in the majority of the sources, which, however, does not cause any difficulties in the interpretation of the text. In the 2nd half of the bar, GC and FE have only one sign: a  before the last chord in the R.H., whereas in FE it restores f2, while in GC – probably erroneously – it raises g2 to g2. GE added to the  written in GC another one, raising b2 to b2. Only EE includes all necessary signs. Moreover, all sources include a superfluous  before d1 in the 3rd crotchet in the L.H. In the main text, we omit this sign, in turn, we add a cautionary  before f3 (in the last chord).

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Inaccuracies in GE , Inaccuracies in FE , GE revisions , Cautionary accidentals , Omission of current key accidentals , Inaccuracies in GC