Issues : fz – f

b. 21

composition: Op. 10 No 6, Etude in E♭ minor

in A

in FE (→GE,EE)

..

Due to a few clear mistakes of FE in reading , we trust rather A than FE (→GE,EE).

category imprint: Differences between sources

issues: Errors in FE , fz – f

b. 26

composition: Op. 10 No 4, Etude in C♯ minor

No marking in AI

 in FE (→GE,EE)

 suggested by the editors

..

 in FE (→GE,EE) is clearly the engraver's mistake here. It is revealed by  in the analogous situation in the previous bar and by a number of other obvious examples of distortion of this mark (see, e.g., the note to bars 16-18).

category imprint: Interpretations within context; Differences between sources

issues: Inaccuracies in FE , fz – f

b. 32

composition: Op. 10 No 6, Etude in E♭ minor

in A

in FE (→GE,EE)

..

The change of  to  is, according to us, a mistake of the engraver of FE (→GE,EE).

category imprint: Differences between sources

issues: Errors in FE , fz – f

b. 34

composition: Op. 10 No 4, Etude in C♯ minor

 in AI

 in FE (→GE,EE)

 suggested by the editors

..

, uncommon in Chopin's autographs, is probably erroneous. Out of a few possible conjectures –  – we suggest , which, according to us, corresponds best to the context between cresc. and . Cf. bars 1 and 16.  

category imprint: Interpretations within context; Differences between sources; Editorial revisions

issues: Inaccuracies in FE , fz – f

b. 47

composition: Op. 25 No 6, Etude in G♯ minor

in FC (→GE)

in FE & EE

Our variant suggestion

..

According to us, the authenticity of  does not raise any doubts. In turn,  in FC (→GE) may be a result of an inaccurate interpretation of [A] by the copyist – the 'f' and 'z' letters from some of Chopin  merge in such a way that they can be considered as one 'f' letter, i.e.  (see the Etude in E major, Op. 10 No. 11, bar 25 or 50).

category imprint: Differences between sources

issues: fz – f