!!! ZMIENIĆ !!!!
The sources lack in an accidental before the last semiquaver, hence it results in a d3. However, an interpretation is possible according to which Chopin, referring to d
1 and d2 from bar 439, also wanted to have a d here. Nevertheless, it is highly likely that the composer heard d3 already here as an anticipation of d2 in bar 443. The Chopinesque harmonic thinking with four-bar sections is indicated by the pedalling: one pedal in bars 436-439 and one in bars 440-443. In the face of unquestionable d2 in bar 443, the use of d3 in bar 441 seems to be absolutely natural in this situation. Therefore, in order to avoid doubts, we add a cautionary 
in the discussed place.
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category imprint: Interpretations within context; Editorial revisions
issues: Cautionary accidentals, Omission of current key accidentals
notation: Pitch