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. 10 No 12, Etude in C minor

No sign in A

 in FE (→GE,EE

..

The  mark was added by Chopin at the time of proofreading FE (→GE,EE).

category imprint: Differences between sources

issues: Authentic corrections of FE

b. 12

composition: Op. 10 No 11, Etude in E♭ major

..

In GE3 (→GE4) the inner note of the 1st chord in the L.H. is a b. It must be a mistake.

category imprint: Differences between sources

issues: Errors in GE , Terzverschreibung error

b. 12

composition: Op. 10 No 5, Etude in G♭ major

e3, more likely reading of A (→FEGE1,EE2EE3)

d3 in GE2 (→GE3GE4GE5) i EE4

..

In A the head of the note embraces the area of two notes, d3 and e3, which stems from the simplified probably hasty correction. In spite of this, in FE (→GE1,EE2EE3) it was correctly interpreted as e3. However, the reviser of GE2 (→GE3GE4GE5) changed it to d3, which was accepted as legitimate also in EE4

category imprint: Graphic ambiguousness; Differences between sources; Corrections & alterations

issues: EE revisions , Corrections in A , GE revisions

b. 12

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

..

In this context the missing  before d must be considered as Chopin's oversight (in the remaining two analogous bars the sign is both in A and the remaining sources).

category imprint: Differences between sources

issues: EE revisions , GE revisions , Cautionary accidentals

b. 12-13

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

not tied in A (→FEGE,EE)

Our suggestion

..

We consider the lack of hold of as an error of A, which was not corrected in any of the subsequent sources. Chopin's more relaxed approach at the time of writing the first phrase of the Etude is indicated by other undeniable mistakes – lack of  before d at the beginning of bar 12 and, above all, overlooking the accidentals in bar 15.

category imprint: Editorial revisions

issues: Errors of A