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. 4

composition: Op. 10 No 1, Etude in C major

e1 in CLI

d1 in FE (→GE,EE

..

It is not entirely clear whether e1 on the 13th semiquaver in CLI is an error of the copyist or the original version of this place. Reasons for the second possibility include the appearance of ein analogous bar 52. 

category imprint: Differences between sources

b. 4-11

composition: Op. 10 No 1, Etude in C major

..

In CLI all octaves in bars 4-11 (and many subsequent ones) are briefly written with the use of the 8 digit under the upper notes. In FE the notation was used only in the case of the quavers in bar 5 and the entire bar 6 (originally probably also in bars 7-8 and subsequent ones), while in GE1 of bars 6-8.

category imprint: Corrections & alterations; Source & stylistic information

issues: Abbreviated octaves' notation

b. 5

composition: Op. 10 No 1, Etude in C major

b3 in CLI & EE

a3 in FE (→GE)

..

The b3 note on the last semiquaver of CLI and EE could be easily considered as a mistake except for the fact that in analogous bar 53 the sources have the same text. Therefore, it cannot be excluded that in CLI we are dealing with the original version, while in EE with the editor's revision.

category imprint: Differences between sources

issues: EE revisions , Errors in EE , Main-line changes , Errors of CLI

b. 5

composition: Op. 10 No 1, Etude in C major

No slur in CLI & FE (→GE,EE2)

Slur over L.H. in EE3 (→EE4)

..

The slur added in EE3 (→EE4) is probably an arbitrary addition of the reviser of EE, who took into consideration the authentic slur in analogous bars 53-54. Situations, in which analogous places differ in performance indications, are very common in Chopin's pieces. It does not always mean that Chopin wanted to underline the diversity of their performance (e.g., in this case non legato in bars 5-6 and legato in bars 53-54). The lack of a slur may be considered here as a suggestion of a smoother, more homogenous phrasing of the entire eight-bar section.

category imprint: Differences between sources

issues: EE revisions

b. 5-6

composition: Op. 10 No 1, Etude in C major

..

In CLI the G1-G octave in bar 5 is a semibreve, while the D1-D octave in bar 6 – a minim. It seems to be highly unlikely for this obvious error to be included in [AI].

category imprint: Interpretations within context; Differences between sources

issues: Rhythmic errors , Errors of CLI