Select: 
Category
All
Graphic ambiguousness
Interpretations within context
Differences between sources
Editorial revisions
Corrections & alterations
Source & stylistic information
Notation
All
Pitch
Rhythm
Slurs
Articulation, Accents, Hairpins
Verbal indications
Pedalling
Fingering
Ornaments
Shorthand & other
Importance
All
Important
Main


b. 12

composition: Op. 25 No 7, Etude in C♯ minor

Demisemiquaver in GC (→GE)

Semiquaver in FE & EE

..

It is unclear how the difference in the rhythm in this place was created, however, none of these two versions seems to be erroneous. The notation of EE indicates a possibility of the engraver's error – the bsemiquaver is placed closer to the bar line than the g semiquaver, therefore, it is possible that in the base text to EE the rhythm was the same as in GC. It also cannot be excluded that the additional dot and beam were added in GC by Chopin, although the graphical image of the notation rather does not confirm it. Due to the above ambiguities, in the main text we give the double dotted rhythm, present in the base source (GC).

category imprint: Differences between sources; Corrections & alterations

issues: Accompaniment changes , Authentic corrections in GC , Dotted or even rhythm

b. 12

composition: Op. 25 No 7, Etude in C♯ minor

..

All sources, except for GE2 (→GE3), include an additional  before c1 in the bottom voice. It can be a remnant of the hypothetical original notation, in which the two previous thirds were written as c1-e1. Following the second German edition, we do not consider this superfluous sign in the main text. 

category imprint: Differences between sources; Editorial revisions

issues: GE revisions , Cautionary accidentals

b. 13

composition: Op. 25 No 7, Etude in C♯ minor

Fingering written into FED & FES

No teaching fingering

Fingering in EE2 (→EE3)

..

The fingering of FES is written with the hand of the pupil, with ink, on the slightly visible, pencilled numerals written by Chopin (cf., bar 14). Chopin wrote the same indications in FED. The fingering added in EE2 (→EE3), in spite of being compatible with the Chopin one, is undoubtedly an addition of the reviser.

category imprint: Differences between sources

issues: Annotations in teaching copies , EE revisions , Annotations in FED , Annotations in FES

b. 14

composition: Op. 25 No 7, Etude in C♯ minor

Fingering written into FES

No teaching fingering

..

The first two numerals were written in ink by the pupil, most probably in the place of pencilled Chopin numerals. The 'one' written with Chopin's hand is visible under the last note of this bar.

category imprint: Differences between sources

issues: Annotations in teaching copies , Annotations in FES

b. 15

composition: Op. 25 No 7, Etude in C♯ minor

..

In GC and FE there is no  lowering c to c. This patent inaccuracy was corrected in GE and EE.

category imprint: Interpretations within context; Differences between sources

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