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b. 6

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

..

In A (→FE,FCGE) there is a  before the d2 crotchet. In the main text we omit the accidental, which was also performed in EE. The use of g1 and g in the L.H. part in the previous bar and on the 2nd quaver in this bar provides the fragment preceding the discussed note with a minor tone, which probably resulted in the need to specify its pitch.

category imprint: Differences between sources; Editorial revisions

issues: EE revisions , Cautionary accidentals

b. 6-10

composition: Op. 28 No. 20, Prelude in C minor

..

In the main text we add cautionary naturals before the F-f octave in b. 6 and 10.

category imprint: Editorial revisions

b. 6

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

Minim & rest in A (→FEEE)

Dotted minim in FC (→GE)

..

The longer chord in the 2nd half of the bar must be Fontana's mistake.

category imprint: Differences between sources

issues: Errors of FC

b. 6

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

Pedalling in A (→FEEE)

No markings in FC (→GE)

..

The missing pedalling markings are one of a few oversights of the copyist in this Prelude.

category imprint: Differences between sources

issues: Errors of FC

b. 6

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

..

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