Issues : Errors repeated in FE

b. 24

composition: Op. 30 No. 1, Mazurka in C minor

..

The sources do not include a  restoring b on the 3rd beat of the bar, which means that this accidental was also absent in [A]. In the main text, we correct this oversight, patent in this harmonic context and generally fairly typical of Chopin.

category imprint: Editorial revisions

issues: Omissions to cancel alteration , Errors of A , Errors of FC , Errors repeated in GE , Errors repeated in FE , Errors repeated in EE

b. 25-26

composition: Op. 28 No. 22, Prelude in G minor

..

As was the case with b. 17 and 19, there are no flats lowering d1 to d1 in b. 25 and 27 in A (→FC,FE). They were added in EE and GE.

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves , Inaccuracies in A , Errors repeated in FE

b. 25-28

composition: Op. 28 No. 19, Prelude in E♭ major

..

In A (→FC,FE) there are no flats lowering to D in b. 25, d2 to d2 in b. 26 and g to g in b. 28. GE and EE2 added all necessary accidentals, whereas EE1 – only those in b. 25 and 28.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , GE revisions , Inaccuracies in A , Errors repeated in FE , Errors repeated in EE

b. 25-27

composition: Op. 28 No. 12, Prelude in G♯ minor

..

As was the case with b. 24, in A (→FC,FE) there is not a single  before the a notes (in various octaves). The accidentals were added in EE (all) and in GE (except a1 in b. 26 and a in b. 27).
See also bars 27-32.

category imprint: Interpretations within context; Differences between sources

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

b. 26-27

composition: Op. 28 No. 16, Prelude in B♭ minor

..

In A (→FE1,FCGE1) there are no flats restoring e2 in these bars, which is Chopin's patent inadvertence. The accidentals were added in EE (both), FE2 (only in b. 26) and GE2 (only in b. 27).

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Omissions to cancel alteration , GE revisions , Errors of A , FE revisions , Errors repeated in GE , Errors repeated in FE