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b. 61

composition: Op. 10 No 4, Etude in C♯ minor

..

We add a cautionary  before b2. The sign was already introduced in GE2 (→GE3GE4GE5) and EE4.

category imprint: Differences between sources; Editorial revisions

issues: EE revisions , GE revisions

b. 62

composition: Op. 10 No 4, Etude in C♯ minor

f-c1-f1 in AI

f-a-c1-f1 in FE (→GE,EE)

..

Same as in bar 12, the chord in AI, devoid of the note, is the original edition of this place. 

category imprint: Differences between sources; Corrections & alterations

b. 63-65

composition: Op. 10 No 4, Etude in C♯ minor

No fingering in AI & FE (→GE)

Fingering in EE

..

The fingering of EE, except for the last numeral in bar 65, repeated after analogous bars 13-15 (although marked less precisely), comes from Fontana.

category imprint: Differences between sources

issues: EE revisions

b. 63-65

composition: Op. 10 No 4, Etude in C♯ minor

Minims in AI

Dotted minims in FE (→GE,EE)

..

Same as in bars 13-15, the plain minims in AI are most probably an inaccurate notation of the final version.

category imprint: Differences between sources

b. 64

composition: Op. 10 No 4, Etude in C♯ minor

A-B in AI, FE (→EE2EE3) & GE5

G-A in GE1 (→GE2GE3GE4) & EE4

..

The corrections visible in AI show that G-A was the original version of the ending in all analogous bars (bars 13-14 and 63-64). According to us, it is therefore probable that in bar 64 in [A] Chopin wrote the original version by mistake, which was passed to the review copy of FE and then to GE1 (→GE2GE3GE4). The mistake was rectified in finished FE (→EE2EE3), as well as in GE5. In turn, EE4 introduces – probably under the influence of GE3 – the erroneous version. 

category imprint: Differences between sources; Corrections & alterations

issues: GE revisions , Errors of A , Authentic corrections of FE