EE1
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b. 252
The c1-a1 sixth is most probably a mistake of the engraver of FE (→EE). It is difficult to assume that Chopin would like to replace the sequence of three voices of the accompaniment, compliant with all rules, with a parallel shift of chords, sounding worse.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Errors in FE, Terzverschreibung error
notation: Pitch