Issues : Accidentals in different octaves

b. 19

composition: Op. 28 No. 17, Prelude in A♭ major

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In A (→FC,FE) as well as in FCI there is no  raising e to e. The obvious Chopin's inaccuracy was corrected in GE and EE.
FC also lacks  in front of the first L.H. quaver, E. Fontana's error was corrected in GE.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , GE revisions , Errors of FC , Inaccuracies in A , Errors repeated in FE

b. 21

composition: Op. 28 No. 17, Prelude in A♭ major

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In FCI and A (→FE,FCGE1) there is no  raising g to g in the 1st L.H. chord. The patent inaccuracy was corrected in EE and GE2 (→GE3).

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves , GE revisions , Inaccuracies in A , Errors repeated in GE , Errors repeated in FE

b. 22

composition: Op. 28 No. 17, Prelude in A♭ major

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In FCI there are no sharps before the middle note of the 2nd L.H. quaver (c1) and before the outer notes of the 3rd quaver (g and g1). In the final version Chopin corrected that patent inaccuracy.

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves , Omission of current key accidentals

b. 23

composition: Op. 28 No. 17, Prelude in A♭ major

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A natural before the bottom note of the 1st bottom R.H. voice quaver (e1) is present only in EE, the only one in which this patent inadvertence of Chopin was corrected. Similarly, the  before the bottom note of the 2nd L.H. quaver (b), overlooked in A (→FE,FCGE), was supplemented only in EE. As far as FCI is concerned, it is difficult to decipher the accidentals here based on the photocopy available to us – it seems that out of 3 necessary accidentals, the top one was overlooked, raising a1 to a1.

category imprint: Interpretations within context; Differences between sources

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

b. 26

composition: Op. 28 No. 17, Prelude in A♭ major

..

On the last quaver in A (→FCGE1) there are no accidentals before the middle notes of the chords in both hands – a  before b1 and a  before d2. The patent inaccuracies were corrected in FE (only the ) and EE (both). In turn, in GE2 (→GE3) naturals were wrongly added before both notes.
(NB: both correct accidentals are present in FCI.) 

category imprint: Interpretations within context; Differences between sources

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