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


b. 13

composition: Op. 28 No. 10, Prelude in C♯ minor

Long accent in A (contextual interpretation→FC)

 in FE (→EE)

No mark in GE

..

The issue of interpreting the mark as a long accent – see b. 1-14. The missing mark in GE is most probably an oversight of the engraver.

category imprint: Interpretations within context; Differences between sources

issues: Long accents , Inaccuracies in FE , Errors in GE

b. 18

composition: Op. 28 No. 10, Prelude in C♯ minor

f in A (probable interpretation→FEEE)

g in FC (→GE)

..

The bottom note of the semiquaver chord was written in A imprecisely, as a result of which it is uncertain whether Chopin meant f or g. According to us, the note is to be interpreted as f, since it covers the full width of the line – cf. a similarly placed f note a line higher, on the 2nd beat of b. 12. Fontana, as a professional musician, could have been influenced by a similar chord two bars earlier.

category imprint: Graphic ambiguousness; Differences between sources

issues: Inaccurate note pitch in A