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. 23-24

composition: WN 17, Polonaise in B♭ major

..

The slur is featured only in PE and it is inseparable from the included there version of the rhythm.

category imprint: Differences between sources

b. 23

composition: WN 17, Polonaise in B♭ major

Four notes in JC & PE

Five notes in EF

..

The additional f2 note in the chord in EF seems to be an arbitrary edition by Fontana, as the version without this note occurs both in JC and in PE. However, it cannot be excluded that Chopin hesitated between four- and five-note version of this chord. He could have added the note in [AI] after JC had already been completed and then resign from it, while writing [A]. In the main text we give the only or the latest authentic version, without f2. Cf. the Mazurka in G minor, Op. 24 No. 1, bars 20 and 28.

category imprint: Differences between sources

b. 23-24

composition: WN 17, Polonaise in B♭ major

Slur in JC

Slurs in EF

Slurs in PE

..

Each of the sources has a different slurring in these bars. When read literally, the slur of JC is not very convincing from the musical point of view, however, it is difficult to determine what could be the composer's intention in [AI]. It cannot be excluded that the right interpretation is included in the first slur in EF.
In the main text we give the slurs of PE, which probably come from [A]

category imprint: Differences between sources

issues: Inaccuracies in JC

b. 23

composition: WN 17, Polonaise in B♭ major

No markings in JC & PE

Pedalling in EF

..

The authenticity of the pedalling in EF, probably added by Fontana, is not excluded. 

category imprint: Differences between sources

b. 23

composition: WN 17, Polonaise in B♭ major

c3-c4 in JC (interpretation)

c3-c4 in PE; alternative interpretation of JC

c3-c3 in EF

..

The version of JC seems to be erroneous, however, it is not clear how the notation of [AI] – probably ambiguous – was like and consequently, which elements of the notation of JC should be corrected. According to us, among the possible errors the most probable ones are the following two: lack of the  raising c4 into c4 or writing mistakenly a  instead of the  before the second grace note. We consider the first possibility as an interpretation of the copy's notation; the second one leads to the version of PE, adopted as the main text. The version of EF is probably a result of Fontana's revision, its correspondence to Chopin's intentions is highly unlikely.  

category imprint: Interpretations within context; Differences between sources

issues: Errors of JC