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. 277

composition: Op. 2, Variations, complete

..

Neither AsI nor A (→GEFE1,EE,FESB) include an accidental to the 7th semiquaver. The F major chord underlying this place is, however, thanks to the C7 chords present directly both before and after it, temporarily the tonic, which requires the use of e2, and not e2. This conclusion is also supported by bar 285 – in the orchestral version of this phrase all sources contain e2(3). The mistake, patent in this context, was, however, corrected only in the stage of proofreading FE2, probably at Chopin's request.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , GE revisions , Omission of current key accidentals , Authentic corrections of FE

b. 278-279

composition: Op. 39, Scherzo in C♯ minor

New slur in EE and GC

One slur in FE and GE

..

Both versions of the slurring may be authentic, and the version of FE is probably later. However, the fact that GE - the source that was, after all, based on GC - has a continuous slur shows how easy it was for the engraver of FE to misread the manuscript. Bearing that in mind, we take the slurs of EE and GC as our main text. The practical difference in performance is very slight anyway. 

category imprint: Differences between sources

b. 278

composition: Op. 39, Scherzo in C♯ minor

..

In GC, this bar is marked as the repetition of the previous one, which must reflect the notation of the autograph.

category imprint: Source & stylistic information

issues: Abbreviated notation of A

b. 278

composition: Op. 21, Concerto in F minor, Mvt I

Long R.H. accent in A (literal reading→GEFE)

R.H. short accent in EE

L.H. long accent in A, interpretation suggested by the editors

..

Same as in bar 130, we consider that it is more likely that the accent refers to the L.H.

category imprint: Graphic ambiguousness; Differences between sources

issues: Long accents , EE inaccuracies , Inaccuracies in A

b. 278

composition: Op. 21, Concerto in F minor, Mvt I

..

In A there is no  restoring a. This patent mistake – cf. analogous bar 130 – remained unnoticed by Chopin both during the proofreading and lessons. Revisers of the editions also did not notice it.

category imprint: Interpretations within context

issues: Errors in FE , Errors in EE , Omissions to cancel alteration , Errors in GE , Errors of A