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. 419

composition: Op. 16, Rondo in E♭ major

..

We add cautionary flats before a1 and a2 in the main text.

category imprint: Editorial revisions

b. 420-421

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

Slurs in A (contextual interpretation) & GE2

Slurs in GE1 (→FEEE)

..

In A bar 420 is the last one on the page, whereas the slur written with a flourish clearly indicates continuation in the next bar. However, there is no ending of this slur in bar 421, which could have reassured the engraver of GE1 of his whole-bar approach (moreover, the traces of corrections visible in bars 420 and 421 suggest that each of these bars was initially encompassed with one slur; the erroneous division of the slur at the beginning of bar 421 was then corrected – perhaps by Chopin – to the version compliant with A). In GE2, Chopin's intention contained in A was reproduced correctly.

category imprint: Graphic ambiguousness; Differences between sources

issues: Inaccuracies in GE , Inaccurate slurs in A , GE revisions , Corrected slurs of Op. 21 in GE1

b. 420

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

Long accent in A (→GE1)

Short accent in FE (→EE)

 in GE2

..

In this place, the long accent was reproduced in GE1 correctly, yet in FE (→EE) it was replaced with a common short accent, whereas in GE2 – with a  hairpin, of the same length as in bar 412.

category imprint: Differences between sources

issues: Inaccuracies in FE , GE revisions

b. 420

composition: Op. 11, Concerto in E minor, Mvt I

 in FE (→EE)

No sign in GE

..

The missing ​​​​​​​ hairpin is most probably an oversight of the engraver of GE1, unless the mark was added in the last proofreading of FE.

category imprint: Differences between sources

issues: Errors in GE

b. 420

composition: Op. 11, Concerto in E minor, Mvt I

..

In FE (→EE), there is no  raising c4 to c4. GE added the mark.

category imprint: Interpretations within context; Differences between sources

issues: Errors in FE , GE revisions , Omission of current key accidentals , Errors repeated in EE