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Op. 10 No 2, Etude in A minor

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b. 12

composition: Op. 10 No 2, Etude in A minor

b not tied in CLI, Ap & FE (→EE2→EE3)

b tied in GE & EE4
..

The ties sustaining b are probably (GE) or certainly (EE4) an addition of revisers of these editions. In the main text we adopt the undoubtedly authentic version of CLI, Ap and FE (→EE2→EE3).

category imprint: Differences between sources

issues: EE revisions , GE revisions

b. 12

composition: Op. 10 No 2, Etude in A minor

No slur in CLI, Ap & FEcor

Slur in FE (→GE,EE) 
..

In one of the later proofreadings of FE (→GE,EE) Chopin added the slur combining f and e (it is absent both in FEcor and Ap). Similarly in bars 4 and 39. 

category imprint: Differences between sources

issues: Authentic corrections of FE

b. 12

composition: Op. 10 No 2, Etude in A minor

..

In CLI, FEcor and EE2 the  returning d1 on the 4th beat of the bar was omitted, which is a patent error. Same as in bar 4, in CLI there is a superfluous  before g1 before this triad.

category imprint: Interpretations within context; Differences between sources

issues: Omissions to cancel alteration , Errors of CLI

b. 12

composition: Op. 10 No 2, Etude in A minor

No mark in CLI & FE (→GE,EE) 

Probable  in Ap

Possible long accent in Ap
..

Same as in analogous bars 3-4, we propose an alternative interpretation of the short  sign, resembling an accent, visible in Ap at the end of bar 12. A similar problem appears also in bars 11, 38 and 39.

category imprint: Graphic ambiguousness; Differences between sources

issues: Long accents

b. 12

composition: Op. 10 No 2, Etude in A minor

Crotchets in CLI & Ap

Different values in FE (→GE,EE) 
..

Same as in bar 4, the rhythm's corrections written in FEcor confirm that the crotchets in CLI and Ap is the original version, changed by Chopin in all three analogous places (also in bar 39).

category imprint: Differences between sources; Corrections & alterations

issues: Accompaniment changes , Authentic corrections of FE