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b. 5-6

composition: Op. 10 No 2, Etude in A minor

No fingering in Ap & FE (→GE)

Additional fingering in EE

..

In EE Fontana added here the fingering which was the literal repetition of Chopin's indication for the upper voice in bars 1-2.

category imprint: Differences between sources

issues: EE revisions

b. 5

composition: Op. 10 No 2, Etude in A minor

No indication in CLI, Ap & FE (→EE,GE1GE2GE3)

in GE4 (→GE5)

..

The  indication was added by the reviser of GE4 (→GE5). Similarly in bars 9 & 13.

category imprint: Differences between sources

issues: GE revisions

b. 6

composition: Op. 10 No 2, Etude in A minor

..

In CLI the lower note is an erroneous f2.

category imprint: Interpretations within context; Differences between sources

issues: Errors of CLI

b. 7

composition: Op. 10 No 2, Etude in A minor

Crotchets in CLI & Ap

Quavers & rests in FE (→GE,EE

..

The alignment of the notation of the L.H. to the rhythm of the previous bars introduced in FEcor (→FEGE,EE) is an undeniable improvement.

category imprint: Differences between sources; Corrections & alterations

issues: Accompaniment changes , Authentic corrections of FE

b. 7

composition: Op. 10 No 2, Etude in A minor

Sixth in CLI

Triad in ApFE (→GE,EE

..

The lack of e1 in CLI may be the original version or – which is much more probable – an error of the copyist (omissions of internal notes of the chords written on ledger lines were quite frequent at the time of reading Chopin's autographs).

category imprint: Differences between sources

issues: Uncertain notes on ledger lines