Select: 
Category
All
Graphic ambiguousness
Interpretations within context
Differences between sources
Editorial revisions
Corrections & alterations
Source & stylistic information
Pitch
All
Pitch
Rhythm
Slurs
Articulation, Accents, Hairpins
Verbal indications
Pedalling
Fingering
Ornaments
Shorthand & other
Importance
All
Important
Main


Pitch

b. 43

composition: Op. 28 No. 12, Prelude in G♯ minor

..

As was the case with b. 3, of which this bar is a repetition in the manuscripts, not written out, in A (→FE,FCGE) there is no  restoring g1 in the bottom R.H. voice on the 3rd crotchet. The mistake was noticed only in EE.

category imprint: Differences between sources; Editorial revisions

issues: EE revisions , Errors repeated in GE , Errors repeated in FE

b. 51

composition: Op. 28 No. 12, Prelude in G♯ minor

..

EE erroneously has  instead of  before the 2nd quaver.

category imprint: Interpretations within context; Differences between sources

issues: Errors in EE

b. 53

composition: Op. 28 No. 12, Prelude in G♯ minor

..

In the main text we add a cautionary  before c2.

category imprint: Editorial revisions

b. 68-69

composition: Op. 28 No. 12, Prelude in G♯ minor

..

In A one can see here crossings-out and corrections in both parts; however, we were able to decipher only some of the crossed-out versions. The 2nd beat of b. 68 could have featured e (with a ) in the L.H. and c1-g1 in the R.H. It must have been d-f that was on the 3rd beat in the L.H., perhaps as a correction of the version with d only. In the R.H., the top voice was not being changed, whereas the bottom one contained c1-f1 (to which Chopin eventually returned) and then a sole c1 note. At the beginning of b. 69 one can see two crossed-out L.H. crotchets – G-d-g, which were probably written first, and G-g.
See also b. 70.

category imprint: Corrections & alterations; Source & stylistic information

issues: Corrections in A , Chopin's hesitations , Deletions in A , Accompaniment changes

b. 70

composition: Op. 28 No. 12, Prelude in G♯ minor

..

The first L.H. octave was being changed a few times in A. Among the crossed-out versions, there was certainly a G-g octave (first on the left) and most probably also an E-e octave (second on the left). The third crossed-out crotchet could have been a G-g octave (again) or a G-d-g chord. Anyway, it seems certain that the eventually written E-e octave is not a mistake, as supposed by many subsequent editors of collective editions.

category imprint: Corrections & alterations; Source & stylistic information

issues: Corrections in A , Chopin's hesitations , Deletions in A , Accompaniment changes