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b. 25-26

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

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In the 1st half of bar 25 CLI includes the clearly earlier notation with the use of sharps instead of flats (d3 and a2 instead of e3 and b2). The notation was not repeated by Chopin in any of the remaining sources. Moreover, in three situations CLI does not refer to the sharp put before the previous note – naturals before the 9th semiquaver in both bars and the 13th semiquaver in bar 25 are missing. Only the last situation may be considered as an obvious error, as in the first two cases the inaccuracy is not striking due to the octave sign, which ends in the middle of the bar, as a result of which, the devoid of the sign note is one octave higher than the previous one (the same inaccuracy occurs in Ap in bar 26).

category imprint: Interpretations within context; Differences between sources

issues: Enharmonic corrections , Errors of CLI

b. 26

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

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Ap is missing a  next to the lower note of the octave at the beginning of the bar. This patent error is one of a few inaccuracies of this autograph's notation.

category imprint: Interpretations within context

issues: Accidentals in different octaves , Errors of A

b. 26

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

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In CLI and FE (→EE) there is no  returning e2 on the 12th semiquaver. This version, with repeated e2, although acceptable from the musical point of view, is however certainly a mistake, which is proved by the  before the next e2, which is legitimate only when the discussed note sounds as e2. The correct text can be found in Ap and GE.

category imprint: Interpretations within context; Differences between sources

issues: Errors in FE , GE revisions , Errors of CLI

b. 26

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

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The third note is written in Ap as dand not c3. In the version for printing Chopin conserved the original notation.

category imprint: Differences between sources

issues: Chopin's hesitations , Enharmonic corrections

b. 26

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

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In EE2 the  before the chord in the R.H. on the 2nd beat of the bar is at the level of g2, which is a mistake. 

category imprint: Interpretations within context; Differences between sources

issues: Errors in EE