2 to f3 in 
As in the previous bar, the beginning of the slur having been placed in GE (→FE,EE) at the beginning of bar 285 is probably a routine revision by the engraver of GE1. As far as the ending of the slur is concerned, in A it is clearly inaccurate – the fact that it reaches only e3 is musically inexplicable. However, it is uncertain whether Chopin wanted the slur to reach only f3, as is the case of GE (→FE,EE), or the g3 quaver, after the remaining slurs in bars 283-286, which always end on longer rhythmic values (quavers or crotchets). In the main text we incline toward the latter.
Compare the passage in the sources »
category imprint: Graphic ambiguousness; Differences between sources
issues: Inaccurate slurs in A, GE revisions
notation: Slurs