b. 256
In the main text we add a cautionary over the trill. In spite of the fact that Chopin considered g notes in a diminished tetrad (on which the 2nd half of the previous bar is based) to be obvious (he did not put naturals to them), in this case he almost certainly did not mean g, which, coupled with an F major chord, would give an impression of temporarily departing from the key of B minor. Taking into account the fact that this key was introduced as a contrast and variety with respect to the previous variations, it is impossible that Chopin would have liked to relativise the tonal awareness.
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notation: Ornaments