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b. 76

composition: Op. 25 No 11, Etude in A minor

..

Same as in bar 12, in GC and FE there is no  raising g1 to g1. In bar 76 it is absent also in EE. The sign was added in GE.

category imprint: Interpretations within context; Differences between sources

issues: Errors in FE , Errors in EE , GE revisions , Omission of current key accidentals

b. 80

composition: Op. 25 No 11, Etude in A minor

Semibreve in GC (→GE1)

Minim in FE, EE & GE2 (→GE3)

..

In GC (→GE1at the beginning of the bar is – most probably erroneously – a semibreve.

category imprint: Interpretations within context; Differences between sources

issues: GE revisions , Rhythmic errors , Errors of GC

b. 83

composition: Op. 25 No 11, Etude in A minor

Chord in GC (→GE)

Octave in FE & EE

..

The fifth chord in GC (→GE) is a result of a correction (of Chopin or of the copyist), however, the initial version, then changed, was not the g-goctave present in FE and EE. Therefore, it seems that in the base texts to these editions Chopin changed this or another original version to the g-goctave.

category imprint: Differences between sources; Corrections & alterations

issues: Accompaniment changes , Authentic corrections in GC

b. 85-86

composition: Op. 25 No 11, Etude in A minor

..

In GC there is no  raising d1 to d1, which is a patent oversight, corrected in GE.

In GC and GE2 (→GE3) there are unnecessary sharps in these bars: in GC before d2 at the beginning of the 3rd and 4th groups of semiquavers in bar 86, while in GE2 (→GE3) before d in the 2nd group in bar 85. 

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves , GE revisions , Cautionary accidentals , Errors of GC

b. 87

composition: Op. 25 No 11, Etude in A minor

..

We add cautionary naturals before d4 and d3. The signs were introduced already in GE2 (→GE3).

category imprint: Differences between sources; Editorial revisions

issues: GE revisions