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b. 51

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

g(1) in GC (→GE), EE & FED

g(1) suggested by the editors

g(1) in FE

..

In FE there are no flats restoring g and g1 on the 5th quaver. As respective signs are before the 9th quaver (in all sources), the version, with g and g1 on the 5th quaver, formally does not contain a mistake. In spite of this, it seems to be much more likely that it is a mistake that happened to Chopin in [A] – in GC (→GE) the composer added the overlooked flats, the signs were also added in EE and FED, which, in both cases, may come from Chopin. Therefore, we are dealing with a too late placement of sign, which is not an isolated case – cf., e.g., the Etude in F major, Op. 10 No. 8, bar 43. In the main text, we do not include the superfluous flats in the 2nd half of the bar.

category imprint: Interpretations within context; Differences between sources

issues: Annotations in teaching copies , EE revisions , Errors in FE , Annotations in FED , Omissions to cancel alteration , Authentic corrections in GC

b. 51

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

..

Before the 9th quaver the sources include flats before g(1). It is probably a remnant of Chopin's correction, hence, we do not include these signs in the main text. 

category imprint: Editorial revisions

b. 53

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

..

In GC and FE1 there is no  restoring d2 (it is, however, included in the L.H.). This mistake, repeated after [A], was corrected in GE, FE2 and all the remaining sources.

category imprint: Differences between sources

issues: Inaccuracies in FE , GE revisions , FE revisions , Inaccuracies in GC

b. 57-75

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

..

Afin ends in bar 12. As a consequence, in the further notes on this page, we do not take this source into consideration.

category imprint: Source & stylistic information

b. 59

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

..

Chopin added the cautionary flats before c-c1 in GC (→GE). They were added – most probably on the basis of GE – also in EE2.

category imprint: Differences between sources

issues: EE revisions , Cautionary accidentals , Authentic corrections in GC