Issues : Omission of current key accidentals

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

b. 33-34

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

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Before the 9th semiquaver there is no  raising e1 to ein AI (the notes are written out only in bar 33, as bar 34 is only briefly marked as repetition of the previous one). It is a patent inaccuracy, which is confirmed by the compatible version of the remaining sources, as well as the comparison with analogous bars 29-30.

category imprint: Differences between sources

issues: Omission of current key accidentals