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Op. 10 No 2, Etude in A minor

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b. 26

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

..

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. 27-28

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

Semiquavers in CLI & FE (→GE,EE) 

Crotchets in Ap
..

The crotchets in the lower voice in the R.H., in Ap on the last beats of these bars, are in strong articulation contrast with the remaining semiquaver two-note chords, which is additionally underlined with the accents. In the main text we give the homogenous, as far as the sound is concerned, version of FE (→GE,EE). 

category imprint: Differences between sources

issues: Chopin's hesitations , Accompaniment changes

b. 27

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

..

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. 27-28

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

No markings in CLI & FE (→GE,EE) 

 and accents in Ap
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 and the accents of Ap (also these on the 2nd beat of both bars) highlight the accentuation suggested by the slurs in the L.H., which are also present in FE (→GE,EE). It is unclear how significant the differences in the accents' size and placement of  marks are. We assume that the latter concern rather the L.H., which stems from the notation of bar 28, and we give the accents preserving the length difference. In FEcor one can see here a printed, yet deleted by Chopin,  mark. It may be a remnant of a possible  included in the handwritten base text. 

category imprint: Interpretations within context; Differences between sources

issues: Long accents , Errors in FE , Authentic corrections of FE