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b. 8

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

No c1 in A (→GE) & EE2 (→EE3)

c1 in chord in FE (→EE1)

..

An additional cnote on the 5th quaver is certainly a mistake. The correct text in subsequent EE is a result of a comparison with analogous bars 27 and 76 or GE1.

category imprint: Differences between sources

issues: EE revisions , Errors in FE , Errors in EE

b. 10

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

..

In A (→GE1FE) there is no  lowering f to f. Chopin's patent oversight was corrected in EE and GE2.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors in FE , Accidentals in different octaves , Errors in GE , GE revisions , Inaccuracies in A

b. 12

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

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In A, the original accompaniment on the 4th beat, crossed out but lisible, was like the figure on 3rd beat, shifted a second higher. See also note to bar 13.

category imprint: Corrections & alterations; Source & stylistic information

issues: Corrections in A , Accompaniment changes

b. 20

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

a1 in chord in A (→GE)

No a1 in FE (→EE)

..

Omission of the anote seems to be a result of Chopin's proofreading, who could have removed it to avoid false relation with the A-a octave on the 4th beat of the bar (in analogous bar 88, in which a remained in the chord, the ending chord is different). However, the version of A (→GE) may be certainly considered an equal variant.

category imprint: Differences between sources

issues: Authentic corrections of FE

b. 20

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

c2 in chord in A, FE (→EE) & GE2

a1 in chord in GE1

..

The version of GE1 is certainly erroneous: it is most probably a revised Terzverschreibung error, by adding a . Chopin restored the chord with c2, written in A, in a proofreading of FE (→EE). At the time of executing this proofreading, a superfluous  was moved together with the note head.  

category imprint: Differences between sources

issues: Errors in GE , Terzverschreibung error , GE revisions , Authentic corrections of FE