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b. 65

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

d(1) in A (→GE1)

d(1) in FE (→EE) & GE2

Idem, R.H. only

..

The missing flats returning d(1) on the 6th semiquaver of the 2nd half of the bar in A (→GE1) is most probably Chopin's mistake. In any case, flats added in the proofreading of FE (→EE) dissipate any doubts about his final intention. Cf. bar 69.

If in bar 64 the version with harmonic accompaniment was chosen, the first or third version is to be selected here.

category imprint: Differences between sources

issues: Omissions to cancel alteration , GE revisions , Authentic corrections of FE

b. 69

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

g1(2) in A (→GE1FE)

g1(2) in EE & GE2

Idem, R.H. only

..

The missing flats before the penultimate demisemiquaver, in spite of their presence in all authentic sources, is almost certainly Chopin's mistake. Descending augmented seconds in scale passages do appear in his works (e.g. in bars 40 and 43), but not in a situation when the upper note of an augmented second would constitute a turning point of a figuration – cf. corresponding places in bars 28, 42 or 65. 

If in bar 64 the version with harmonic accompaniment was chosen, the first or third version is to be selected here.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , GE revisions , Omission of current key accidentals , Last key signature sign

b. 70

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

..

In the main text we add cautionary naturals over the trills.

category imprint: Editorial revisions

b. 72-74

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

..

In A there is no octave sign over the entire sequence of chords written with small notes. The patent mistake was corrected already in GE1 (→GE2,FEEE), which could have been a result of Chopin's proofreading (however, the correction could have also been implemented by the reviser, since due to the overlapping of the hands, the mistake is evident).

category imprint: Differences between sources

issues: Errors of A , Authentic corrections of GE

b. 75

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

..

In A Chopin wrote the  returning donly before the 19th demisemiquaver. The patent mistake was rectified – perhaps by Chopin – in the proofreading of GE1 (→GE2,FEEE).

category imprint: Interpretations within context; Differences between sources

issues: Authentic corrections of GE