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WN 17, Polonaise in B♭ major

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b. 26-30

composition: WN 17, Polonaise in B♭ major

No signs in JC & EF

Accents in PE
..

The long accents visible in PE – one in bar 26 and two in bar 30 – create a developed and enriched image of this section, together with slurs and other changes. The decision concerning performing the accents in bar 28 must be left to the taste of the pianist.

category imprint: Differences between sources

issues: Long accents

b. 26-30

composition: WN 17, Polonaise in B♭ major

No trill endings in JC & GEF

Trill endings in FEF

PE

Our suggestion
..

Trill endings in the form of a double grace note are to be found in FEF in all three analogous places (bars 26, 28, and 30), while in PE only in the first two. Regardless of whether the lack of ending in bar 30 appeared still in [A], or if it is a mere engraver's oversight, it seems to be highly unlikely that a trill in this place should be performed differently than in the previous two. 
Lack of endings in GEF proves that Fontana introduced last corrections into FEF after GEF had already been printed.

category imprint: Differences between sources

issues: Fontana's revisions

b. 26-28

composition: WN 17, Polonaise in B♭ major

Rhythm and a1 in #KJ

Rhythm and f1 in EF

Rhythm and f1 in PE
..

The single-voice notation of the 1st chord in bars 26 and 28 in JC and EF is probably inaccurate: the notation of JC in bars 25 and 27 is a proof that Chopin did not precisely determine the bass note's extensions in [AI]. In the main text we give the notation of PE in both bars in the form used in bar 26; it guarantees a consistent division into voices, in which the two-note chords struck on strong beats of bars 25-26 have the value of quavers. Cf. bar 30. 

As the 2nd quaver in bar 26, JC features the most probably erroneous a1. See the note related to the 4th quaver of that bar.

category imprint: Differences between sources

issues: Inaccuracies in PE

b. 26-30

composition: WN 17, Polonaise in B♭ major

Quavers f (g) in JC & EF

Crotchet in PE
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The bass notes struck on the 2nd beat of the bar – f in bars 26 and 28 and g in bar 30 – are not extended in JC and EF. In the main text we include the more precise notation of PE. Cf. notes concerning bars 25-27 and 29-30.

category imprint: Differences between sources

b. 26

composition: WN 17, Polonaise in B♭ major

a1 in JC

f1 in EF & PE
..

On the 4th quaver of the bar, JC has the a1 note, similarly as on the second. It is almost certainly a mistake, perhaps of Chopin himself committed in [AI]. Such a type of errors belongs to the most often both in autographs and copies.

category imprint: Differences between sources

issues: Terzverschreibung error , Errors in the number of ledger lines , Errors of JC