Issues : Omissions to cancel alteration

b. 170

composition: Op. 23, Ballade in G minor

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None of the sources includes a  restoring e2 at the end of the bar. It must be Chopin's oversight – it is the most frequent mistake committed by Chopin. In this case, the likelihood of an error was additionally increased by the change of pitch of the note – initially, Chopin wrote here a2 in A – performed almost certainly due to the combination with the next bar.

category imprint: Interpretations within context; Differences between sources

issues: Omissions to cancel alteration , Errors resulting from corrections , Errors repeated in GE , Errors repeated in FE , Errors repeated in EE

b. 247

composition: Op. 23, Ballade in G minor

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In A (→FEEE) there is no  restoring b2 on the penultimate quaver. A comparison with similar phrases an octave higher and lower proves that it was an oversight by Chopin. The accidental was added by GE.

category imprint: Interpretations within context; Differences between sources

issues: Omissions to cancel alteration , Errors of A , Errors repeated in FE , Errors repeated in EE