Issues : Inaccuracies in A

b. 7-11

composition: Op. 10 No 9, Etude in F minor

Staccato dots in AI & FE (→GE,EE)

No marks in A

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The incomplete staccato indications in A were added in a proofreading of FE (→GE,EE). What is interesting is the fact that all dots are also in AI

category imprint: Differences between sources

issues: Authentic corrections of FE , Inaccuracies in A

b. 21-23

composition: Op. 10 No 9, Etude in F minor

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The sources are missing some of the flats before g notes (in various octaves). None of these inaccuracies raise any doubt concerning the sound intended by Chopin. In AI there are no  before g, as well as before G and g1 in bar 23. In A both flats in the L.H. in the 2nd half of bar 22 are missing; only the first of them was added in FE. The remaining sources have the correct text. 

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , Inaccuracies in FE , GE revisions , Omission of current key accidentals , Authentic corrections of FE , Inaccuracies in A