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b. 4

composition: Op. 10 No 1, Etude in C major

e1 in CLI

d1 in FE (→GE,EE

..

It is not entirely clear whether e1 on the 13th semiquaver in CLI is an error of the copyist or the original version of this place. Reasons for the second possibility include the appearance of ein analogous bar 52. 

category imprint: Differences between sources

b. 4-11

composition: Op. 10 No 1, Etude in C major

..

In CLI all octaves in bars 4-11 (and many subsequent ones) are briefly written with the use of the 8 digit under the upper notes. In FE the notation was used only in the case of the quavers in bar 5 and the entire bar 6 (originally probably also in bars 7-8 and subsequent ones), while in GE1 of bars 6-8.

category imprint: Corrections & alterations; Source & stylistic information

issues: Abbreviated octaves' notation

b. 4

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

No fingering in Ap

Fingering in FEcor

FE (→GE1GE2, →EE

..

We give the alternative fingering on the basis of Chopin's entry in FEcor. In finished FE (→GE1GE2,EE) those three digits were mistakenly put one semiquaver earlier. Repetition of the same error in EE is of particular surprise, as the fingering was revised and added by Fontana (cf. bar 12). Revisers of GE3, GE4 and GE5 tried to respectively simplify the fingering's notation and to make it more precise in this place; however, none of them realised the essence of the mistake.

category imprint: Differences between sources

issues: Errors in FE , Authentic corrections of FE

b. 4

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

Crotchets in CLI & Ap

Different values in FE (→GE,EE

..

The corrections of the rhythm written in FEcor confirm that the crotchets in CLI and Ap is the original version, changed by Chopin in all three analogous places (bars 12 and 39).

category imprint: Differences between sources; Corrections & alterations

issues: Accompaniment changes , Authentic corrections of FE

b. 4

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

Probable  in Ap

Possible long accent in Ap

 in FE (→GE,EE

Our alternate suggestion

..

The  mark in FE (→GE,EE) is one of a few that had already been printed in FEcor. Therefore, its compliance with Chopin's intention is not certain due to the possibility of reversing the direction of the sign as a result of the engraver's error (cf., e.g., the Etude in C minor, No. 12, bar 53). Such an error seems to be possible if we take into consideration the four-bar section which ends here and the recurring first phrase with its crescendo and a possible  in Ap.

category imprint: Graphic ambiguousness; Interpretations within context; Differences between sources

issues: Long accents , Errors in FE , Sign reversal