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. 27-28

composition: Op. 28 No. 16, Prelude in B♭ minor

  in A, contextual interpretation

  in FC

  in FE (→EE)

  in GE

..

In both  marks in A the top arm is clearly longer than the bottom one. We adopt the range of the top arm, written first, in accordance with the more carefully written mark in similar b. 26. The relatively minor inaccuracies in the reproduction of the   marks in FC were exaggerated in GE, in which attempts were taken at placing the marks in such a way that they fill the entire bars. A similar manner, although only in b. 27, can also be seen in FE (→EE).

category imprint: Graphic ambiguousness; Differences between sources; Source & stylistic information

issues: Inaccuracies in FE , Scope of dynamic hairpins , GE revisions , Unclear hairpins in A , Inaccuracies in FC

b. 27

composition: Op. 28 No. 16, Prelude in B♭ minor

 on d in A, literal reading

 on A in A, probable interpretation (→FCGE, →FEEE)

..

The position of the  mark in the middle of the bar is confusing in A – it is placed between the A and the d quavers. According to us, it is more likely that Chopin meant A, as it was actually interpreted both in FC (→GE) and FE (→EE). It is supported by the resemblance to b. 26, in which  is clearly under the 4th quaver in the bar, and by the preceding  asterisk having been placed before the 4th quaver in spite of no harmonic change.

category imprint: Graphic ambiguousness

issues: Inaccuracies in A

b. 28-29

composition: Op. 28 No. 16, Prelude in B♭ minor

..

In A stretto was initially written over a bar earlier – the indication was placed over the 4th beat of b. 28 and the 1st beat of b. 29. Chopin then crossed it out together with the dashes marking its range (falling on b. 29) and rewrote it in b. 30.

category imprint: Corrections & alterations; Source & stylistic information

issues: Corrections in A , Deletions in A

b. 28

composition: Op. 28 No. 16, Prelude in B♭ minor

..

EE has a  (cautionary?) before the penultimate semiquaver. In the editors' opinion, it could have been placed there by mistake – it was presumably meant to restore d2 one note before, where it occurs in all the remaining sources, and where it is necessary (the distances between notes indicate that the  restoring d2 was initially omitted, and added only later).

category imprint: Differences between sources

issues: EE revisions , Errors in EE

b. 29-30

composition: Op. 28 No. 16, Prelude in B♭ minor

2 slurs in A

No slurs in FC (→GE) & EE
 

Slur in bar 29 in FE

..

In the main text we give the two L.H. slurs beginning in the 2nd half of b. 29 after A. None of the remaining sources reproduced them faultlessly.

category imprint: Differences between sources

issues: Errors in FE , Errors in EE , Errors of FC