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b. 66

composition: Op. 10 No 12, Etude in C minor

Long accent in A

Short accent in FE (→EE)

No mark in GE

..

The long accent included in A was reproduced in FE (→EE) as a short one. In GE the mark was omitted.

category imprint: Interpretations within context; Differences between sources

issues: Long accents , Inaccuracies in GE

b. 67

composition: Op. 10 No 12, Etude in C minor

No fingering in A

Numeral '1' in FE

Numeral '3' in GE, EE & FED

..

FE gives the '1' fingering digit under the 4th note. This patent error was overridden both in GE and EE. Chopin wrote a relevant correction also in FED.

category imprint: Differences between sources

issues: Annotations in teaching copies , EE revisions , Errors in FE , Annotations in FED , GE revisions

b. 67

composition: Op. 10 No 12, Etude in C minor

..

A does not include the  before the topmost note of the chord on the 3rd beat of the bar. This patent oversight was completed in FE (→GE,EE). In turn, in all sources, except for GE3 (→GE4), there are unnecessary flats before c2 in this chord and before f2 on the 4th beat of the bar.

category imprint: Differences between sources

issues: Accidentals in different octaves , GE revisions , Cautionary accidentals , Errors of A , Authentic corrections of FE

b. 68

composition: Op. 10 No 12, Etude in C minor

in A (→FEGE)

d in EE

..

In the main text we give (with a cautionary ) after A. In FE there are two accidentals before this note,  and , one on another. It is an easier performed correction, however, it is unclear which of the signs was supposed to be removed and which should be considered as binding. GE includes a  and EE – 

category imprint: Graphic ambiguousness; Differences between sources

issues: Errors in FE , Errors in EE , Cautionary accidentals , Authentic corrections of FE

b. 68

composition: Op. 10 No 12, Etude in C minor

Slur in A

No slur in FE (→GE)

Slur in EE

..

Lack of the slur in FE (→GE) is certainly a mistake. The half-bar-long slur, added here in EE, can also be an error.

category imprint: Differences between sources

issues: EE revisions , Errors in FE