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b. 6

composition: Op. 25 No 10, Etude in B minor

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The sharps returning f1 and F on the 3rd beat of the bar are present only in GE2 (→GE3). A similar mistake appears in bar 108.

category imprint: Interpretations within context; Differences between sources

issues: Omissions to cancel alteration , GE revisions

b. 7-8

composition: Op. 25 No 10, Etude in B minor

..

In the 2nd half of the bar the sources repeat the sharps before A1-A and a-a1. In the main text we delete the unnecessary signs.

category imprint: Editorial revisions

issues: Cautionary accidentals

b. 10

composition: Op. 25 No 10, Etude in B minor

E-e in GC (→GE)

F-f in FE & EE

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The E-e octave at the end of the bar in GC (→GE) is almost certainly the copyist's mistake, who inaccurately repeated the previous bar. In the version of FE and EE, adopted in the main text, Chopin smoothly changed the interval between the parts of both hands from octave to sixth, as part of the D minor chord, being the base of the 2nd half of the bar. 

category imprint: Differences between sources

issues: Errors of GC

b. 11

composition: Op. 25 No 10, Etude in B minor

..

In GC (→GE1), FE and EE there are no naturals returning B-b. This patent oversight was corrected in GE2 (→GE3).

category imprint: Interpretations within context; Differences between sources

issues: Omissions to cancel alteration , GE revisions

b. 13

composition: Op. 25 No 10, Etude in B minor

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In GC and FE there are no sharps raising g2-g3 to g2-g3. The patent error was corrected in GE, EE also features the correct text.

category imprint: Interpretations within context; Differences between sources

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