mUltimate Chopin

Op. 10 No 2, Etude in A minor

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b. 26

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

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The cautionary  before g2 is missing in the manuscripts.

category imprint: Differences between sources

issues: Cautionary accidentals

b. 27

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

..

In CLI and FEcor there are no accidentals before the fourth in the lower voice, which is certainly a mistake.
CLI and FE (→GE1→GE2→GE4,→EE) have an unnecessary  before b2 in this place.

category imprint: Differences between sources

issues: Errors in FE , GE revisions , Cautionary accidentals , Authentic corrections of FE , Errors of CLI

b. 27

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

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In one of the last proofreadings of FE the A-a octave was preceded with naturals, which are highly unjustified here. The signs were probably added – by Chopin or perhaps by the reviser who worked with him – together with the necessary  returning a2 on the 12th semiquaver; it is possible that this is the fact that influenced the person introducing the corrections. The naturals are not included in the manuscripts, they were also removed from GE4 (→GE5). 

category imprint: Differences between sources

issues: GE revisions , Cautionary accidentals , Authentic corrections of FE

b. 27

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

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The sources prove Chopin's hesitation concerning the notation of the 3rd semiquaver on the 2nd and 3rd beats of the bar. It is best seen in Ap, in which the clear traces of corrections are visible in the 2nd group of the notes, and possible ones – in the 3rd one. In the case of the first of the corrections, a2, most probably, was changed to g2, however, in the photograph available to the editors of mUltimate Chopin, one cannot certainly determine the direction of the changes. The result of the possible second correction is obvious – g2.
In the remaining sources the difference concerns only the 7th note, which in CLI is written as g2 and in FE (→GE,EE) – as a2. The hesitation was probably a result of the natural returning a2 in the 3rd group of semiquavers (added in one of the later proofings).  

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

issues: Errors in FE , Enharmonic corrections , Authentic corrections of FE

b. 27-28

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

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In CLI the last beat of bar 27 and the 1st half of bar 28 are written in the part of the R.H. with the use of an octave sign, which, however, stops at the end of bar 27. The mechanical error of the copyist leaves no place for doubts, as there is no loco indication, with which the return to the written pitch was indicated back then. The musical context also unanimously indicates the place where the octave sign was supposed to end.

category imprint: Interpretations within context; Differences between sources

issues: Errors of CLI