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. 3

composition: Op. 25 No 8, Etude in D♭ major

g2 (without ) in A (→GE1), FE & EE 

g2 in GE2 (→GE3)

g2 (with ) in FES

..

There is no accidental before the bottom note of the 10th sixth, which makes it to be interpreted as g2. The flat added here in GE2 (→GE3) cannot come from Chopin, yet, one has to admit that a similar addition in many other places would be absolutely accurate – cf. the adjacent note. Possible doubts concerning the sound of this note is dissipated by the  added before it in FES.

category imprint: Differences between sources; Editorial revisions

issues: GE revisions

b. 3

composition: Op. 25 No 8, Etude in D♭ major

..

In A (→GE1), FE and EE there is no  returning f2 in the penultimate sixth. This patent error was noticed only in GE2 (→GE3) on the occasion of a thorough revision of accidentals – cf. the notes concerning the natural and flat before the previous sixth. 

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 A

b. 3

composition: Op. 25 No 8, Etude in D♭ major

e2-c3 in A (→GE) & FE

e2-c3 in EE

..

The authenticity of the version with c3 is undeniable – Chopin fingered it twice and heard it then during the lessons. However, it cannot be said of the version with c3 – the copyist or reviser of EE could have added a , considering the failure to preserve the rule of parallel movement of the voices to be a sign of mistake. However, it does not mean that it was like that – it could have also been Chopin that introduced this variation.

category imprint: Differences between sources

issues: EE revisions

b. 3

composition: Op. 25 No 8, Etude in D♭ major

..

In A (→GE) and FE there is a superfluous  (cautionary?) before d2. The absence of the sign in EE may be result of a revision.

category imprint: Differences between sources; Editorial revisions

issues: EE revisions , Cautionary accidentals

b. 3-4

composition: Op. 25 No 8, Etude in D♭ major

One slur in A (→GE) & EE

Two slurs in FE

..

The separated slur is most probably a result of an inaccurate reproduction of the manuscript in FE. Cf. bars 7-8.

category imprint: Differences between sources

issues: Inaccuracies in FE