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. 25 No 9, Etude in G♭ major

..

The cautionary  before c1, undoubtedly justified in this context, was added only in GE and EE3.

category imprint: Differences between sources; Editorial revisions

issues: EE revisions , GE revisions

b. 4-5

composition: Op. 35, Sonata in B♭ minor, Mvt I

No slur in GC (→GE) & FE1 (→FE2EE)

Slur in FE3 (→FE4)

..

The slur over the part of the L.H. is undoubtedly a Chopin addition introduced in the proofreading of FE3 (→FE4).

category imprint: Differences between sources; Corrections & alterations

issues: Authentic corrections of FE

b. 4

composition: Op. 35, Sonata in B♭ minor, Mvt II

..

FE (except for FE4) lacks in five necessary accidentals – naturals before d2 and b and sharps before ff2 and g2. This patent inaccuracy certainly has its source in the notation of [A]. Similarly in GC, in which, however, Chopin added a  raising b to b. In GC (→GE) there are also no naturals before the last octave in the R.H. – it can be an oversight of the copyist or a later addition in [A]. In the remaining sources the signs were completed (all additions can be attributed to a revision): three were added in EE1 and FE4, four in GE; only EE2 includes the correct notation. Cf. bar 24.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , Inaccuracies in GE , Inaccuracies in FE , GE revisions , Omission of current key accidentals , FE revisions , Inaccuracies in GC , Authentic corrections in GC

b. 4-5

composition: Op. 35, Sonata in B♭ minor, Mvt IV

Fingering written in FED, more probable reading

Less probable reading

No teaching fingering

..

The fingering, added in pencil, most probably by Miss O'Méara, could have been indicated to her by Chopin. According to us, the numeral under the last quaver in bar 4 can be interpreted in two ways – as '4' or as '1'.

category imprint: Graphic ambiguousness; Differences between sources

issues: Annotations in teaching copies , Annotations in FED

b. 4

composition: Op. 35, Sonata in B♭ minor, Mvt III

No grace note in GC (→GE)

Grace note in FE (→EE)

Our variant suggestion

..

It is not clear whether Chopin wanted to have a grace note already in this bar – it appears without any doubts in bars 10, 22, 30 and analog. The ornament was deleted – most probably by Chopin – in GC, yet it remained in FE despite a few corrections and visible traces of development in pupil's copies. Due to these reasons, in the main text we suggest a variant solution.

category imprint: Differences between sources; Editorial revisions

issues: Chopin's hesitations , Authentic corrections in GC