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In Ap three last two-note chords of the lower voice in the R.H. are crotchets. After the previous (from the beginning of bar 47) five semiquavers, it means an attenuation of articulation (in this context semiquavers imply staccato, whereas crotchets – tenuto or legato), which corresponds to the final diminuendo.
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations
issues: Chopin's hesitations, Accompaniment changes
notation: Rhythm