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b. 17

composition: WN 17, Polonaise in B♭ major

..

At the beginning of the bar, JC includes the erroneous B1-A seventh. Similarly in bar 44, which is not written out in JC.

category imprint: Interpretations within context; Differences between sources

issues: Errors of JC

b. 17

composition: WN 17, Polonaise in B♭ major

One dot in JC

Four dots in EF & PE

..

In JC, only the highest note of the chord, d2, is prolonged with a dot. Chopin would often use such a notation, therefore, it cannot be excluded that it corresponds to the notation of [AI] and does not have to be a mistake. In the main text we give the unequivocal compatible version of EF and PE

category imprint: Differences between sources

issues: Inaccuracies in JC

b. 19

composition: WN 17, Polonaise in B♭ major

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In JC there is no  in front of c3, which in the original notation, in which the octave sign begins already from this note, is an evident error. Similarly in bar 46, which is not written out in JC.

category imprint: Interpretations within context; Differences between sources

issues: Cautionary accidentals , Errors of JC

b. 19

composition: WN 17, Polonaise in B♭ major

..

In JC there is no  lowering a3 into a3, which is a patent error; in the copy there is also no relevant sign before a2. PE is also missing a flat before the latter, which can correspond to the notation of [A], as Chopin often extended the validity of cautionary accidentals onto entire passages or scales of this kind.

The same applies to bar 46, marked in the sources as a repetition of bar 19. 

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves , Omission of current key accidentals , Errors of JC , Inaccuracies in PE

b. 20-21

composition: WN 17, Polonaise in B♭ major

Crotchet in JC & EF

Quaver & semiquaver in PE

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The version of JC and EF is undoubtedly earlier. Not only is the version of PE melodically enriched, but also marked more precisely from the performance point of view (the slur and dynamic hairpins).

category imprint: Differences between sources

issues: Main-line changes