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. 17

composition: Op. 28 No. 18, Prelude in F minor

..

In A the second part of the passage was crossed out and rewritten. The reason could have been, e.g. Chopin's mistake, who wrote the passage as if there were no octave sign over the first part thereof, hence without f2-e2-d2-a1. However, it seems more likely that it is a trace of the initial version of the passage, which started an octave lower: . The latter is supported by the fact that the octave sign seems as if it were added to the finished text, e.g. it overlaps with the accent. Broadening the span of the passage would also harmonize with the similar corrections performed in the previous fragment – see b. 16-17.

category imprint: Corrections & alterations; Source & stylistic information

issues: Corrections in A , Deletions in A

b. 17

composition: Op. 28 No. 18, Prelude in F minor

..

In A there is no  before the bottom note of the L.H. octave. As at the end of b. 15, this patent inaccuracy of Chopin was already corrected in FC (→GE) and FE (→EE).

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves , FE revisions , Fontana's revisions , Inaccuracies in A