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b. 48

composition: WN 17, Polonaise in B♭ major

..

We add a cautionary  before a1.

category imprint: Editorial revisions

b. 48

composition: WN 17, Polonaise in B♭ major

..

We add a cautionary  before the grace note.

category imprint: Editorial revisions

b. 49

composition: WN 17, Polonaise in B♭ major

Tied b2 in JC

Repeated b2 in #FE

Rest in PE

Our suggestion

category imprint: Interpretations within context; Differences between sources; Editorial revisions

b. 49

composition: WN 17, Polonaise in B♭ major

..

JC has a cautionary  before the 4th semiquaver, a1. In the light of the currently binding rules, a sign in this position is superfluous.

category imprint: Source & stylistic information

issues: Cautionary accidentals , Last key signature sign

b. 50

composition: WN 17, Polonaise in B♭ major

c3-c4 in JC (interpretation)

c3-c4 in PE; alternative interpretation of JC

c3-c3 in EF

category imprint: Interpretations within context; Differences between sources