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b. 23

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

No marking in GC (→GE) & EE

in FE

..

 visible in FE is the original version – Chopin deleted such indications in GC (→GE).

category imprint: Differences between sources; Corrections & alterations

issues: Authentic corrections in GC

b. 24-25

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

Two long accents in GC

No marks in FE

Short accents in EE & GE

..

In the main text we give differentiated accents, written most probably with Chopin's hand in GC. GE reproduced all of them as short ones, EE too. 

category imprint: Differences between sources

issues: Long accents , Inaccuracies in GE , Authentic corrections in GC

b. 25

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

Broken slur in GC (literal reading→GE1) & FE

Continuous slur in GC (possible interpretation), EE & GE2 (→GE3)

..

The slur in bar 25 in GC is broken, yet the way in which the slur in bar 26 starts suggests, according to us, continuation of the slur, as it is in EE (and later GE). It is hard to state what was Chopin's intention in this place, yet this kind of differences has a minimal influence on the performance.

category imprint: Differences between sources

b. 25

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

g-f1 in GC

f-f1 in FE, EE & GE2 (→GE3)

g-g1 in GE1

..

The seventh in GC is certainly erroneous, however, without comparing it to other sources, it is unclear whether the mistake concerns the bottom or top note. It is proved by the way the place was revised in GE1. In the main text we give the undoubtedly correct text of FE, EE and GE2 (→GE3).

We add cautionary sharps before F1-F and f-f1.

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

issues: Errors in GE , GE revisions , Errors of GC

b. 26

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

E in GC, FE, EE1 (→EE2) & GE2 (→GE3)

E in GE1 & EE3

..

In GC, FE and EE there are no accidentals before the 9th quaver, so it is not entirely clear whether it is to be read as e-e1-e2-e3 or e-e1-e2-e3. The comparison with the previous bar indicates a typical for Chopin oversight of naturals returning e and e2. GE1, however, added the  raising e3 to e3, which is certainly a mistake (yet it was repeated in EE3). The correctly written text is featured only in GE2 (→GE3).

In EE1 the top note of the part of the R.H. is mistakenly written as d3

category imprint: Interpretations within context; Differences between sources

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