In the 2nd half of bar 311 the L.H. part was corrected twice in A, which is evidenced by the visible deletions. Eventually, Chopin was forced to write the final version on the stave below. The initial entry was very carefully crossed out – first alone and then with the entire 2nd half of the bar – hence it is difficult to say what it was. In an analogous place in bar 313 a d1-e1-g
1-b1 chord was deleted (a crotchet, without division into parts); perhaps this was also the case here (rather without a rest). Anyway, Chopin then wrote – still on the same stave – a version close to the final one, yet with 4 minims in the bottom voice, b-d1-e1-g1. The notation of this version was almost finished, with all necessary accidentals, a slur and the correct, five-note chord at the beginning of the next bar: 
.
Compare the passage in the sources»
category imprint: Corrections & alterations; Source & stylistic information
issues: Corrections in A, Deletions in A, Accompaniment changes
notation: Pitch