GE1
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The missing lower slur must be an oversight by the engraver of GE1. Such multiple slurs were used by Chopin quite rarely, most often in his early pieces – cf. the combination of chords in bar 266 or 295-296, or pairs of octaves in the Concerto in F minor, Op. 21, mov. III, bars 472-480.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Errors in GE
notation: Slurs