Issues : Errors of A

b. 6

composition: Op. 50 No. 3, Mazurka in C♯ minor

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Both autographs are lacking in the  raising a1 to a1. The mistake is also in EE, where it was repeated after the proof copy of FE. In the very FE Chopin added the overlooked accidental; the correct text is also in GE.

category imprint: Interpretations within context; Differences between sources

issues: Errors of A , Authentic corrections of FE , Last key signature sign , Errors repeated in EE

b. 6

composition: Op. 28 No. 21, Prelude in B♭ major

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The sources do not contain an accidental before the top note of the third on the 4th quaver in the bar, as a result of which it should be interpreted as e-g. It must be Chopin's inadvertence – the characteristic f(-d1) – e-g e-a sequence appears 10 times throughout the Prelude (excluding this place), always with g, even when it is preceded by a g-e sixth (in b. 41). Analogous sequences are to be found on a number of occasions also in other harmonic contexts, always with a minor third on the second quaver. Therefore, Chopin was fully entitled to consider the  to be obvious in this place.

category imprint: Interpretations within context; Editorial revisions

issues: Omissions to cancel alteration , Errors of A , Errors repeated in GE , Errors repeated in FE , Errors repeated in EE

b. 6

composition: Op. 28 No. 13, Prelude in F♯ major

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The  restoring g in the 2nd half of the bar is absent in all the sources. It is one of Chopin's most common mistakes. The g note is so obvious that EE did not notice the mistake in spite of the cautionary  having been added before g1 in the 2nd R.H. chord.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Omissions to cancel alteration , Errors of A , Errors repeated in FE , Errors repeated in EE

b. 7

composition: Op. 10 No 2, Etude in A minor

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In Ap there is no  returning a2 at the 9th semiquaver of the bar. It must have been Chopin's oversight. 

category imprint: Differences between sources

issues: Omissions to cancel alteration , Errors of A

b. 7

composition: Op. 25 No 2, Etude in F minor

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AT, AW and CDP do not have here the  before the 5th (e2) quaver. In AW and CDP, the inaccuracy is also in bar 26, while in CDP also in bar 57. 

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves , Errors of A , Errors of CDP