Issues : Omission of current key accidentals

b. 18

composition: Op. 10 No 6, Etude in E♭ minor

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In A (→FEGE1GE2GE3GE4) there is no  raising c1 to c1 in the chord at the beginning of the bar, which must be an error. Chopin added the necessary sign in FED (as well as the second one "on the run", unnecessary before in the 2nd half of the bar). The correct text is included also in EE and GE5.  

category imprint: Interpretations within context; Differences between sources

issues: Annotations in teaching copies , EE revisions , GE revisions , Omission of current key accidentals , Errors of A , Annotations in FES

b. 18-19

composition: Op. 10 No 6, Etude in E♭ minor

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In A (→FE) Chopin omitted the naturals raising B1 to B1C to C and c to c. The second of them was added in FES. In GE was added at the end of bar 18, yet both signs in bar 19 appeared only in GE3 (→GE4GE5). EE has the correct text. 

category imprint: Interpretations within context; Differences between sources

issues: Annotations in teaching copies , EE revisions , Accidentals in different octaves , GE revisions , Omission of current key accidentals , Annotations in FES

b. 20

composition: Op. 10 No 6, Etude in E♭ minor

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In A (→FEGE1GE2,→EE2EE3) there is no  raising G to G. This patent accuracy was corrected in FES and later editions.

In the sources the natural raising g to g is before the first sustained semiquaver in the bar. We move it before the 4th note, according to General Editorial Principlesp. 3.

category imprint: Differences between sources

issues: Annotations in teaching copies , EE revisions , GE revisions , Omission of current key accidentals , Annotations in FES , Inaccuracies in A

b. 29

composition: Op. 10 No 6, Etude in E♭ minor

C-c in A (→FEEE,GE1GE2GE3GE4)

C-c in FES & GE5

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In A and the editions – except for one – there are no naturals before the 1st octave in this bar (nor a cautionary  before c2 in the middle of the bar). The harmonic context clearly indicates Chopin's oversight, which is confirmed by his entry in FES. The mistake was overlooked by the revisers until GE5.

category imprint: Differences between sources

issues: GE revisions , Omission of current key accidentals , Last key signature sign