Brilliant Move For Black

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QuasOllie
What Rating Should This Puzzle Be?

Arisktotle
QuasOllie wrote:
What Rating Should This Puzzle Be?

It's not a good puzzle since the ratings of several moves are close. But 1. ... b5 is the best by a small margin and not Bxf2+ as you probably had in mind.

Btw, you forgot to enable white's castling rights in the diagram. Such errors destroy puzzles!