According to us, the most likely explanation for the difference in the placement of the E
1 crotchet would be it having been added by Chopin both to A and [FC], although a Chopinesque correction to [FC] is also likely, not to mention a mistake by the copyist, misled by the similarity between the subsequent two-bar phrases. As it is impossible to determine whether Chopin considered one of the versions final, in the main text we give the text of the principal source (A), recommending the FE version as an equal variant.
The absence of E1 in GE1 most probably resulted from the engraver's distraction, who left space for this note while inserting 
, but eventually did not add it. This is not the only piece of evidence for the engraver's distraction in bar 186 – he also overlooked the first tie to B.
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations
issues: Authentic corrections of FE, Bass register changes
notation: Pitch