Raxb1. Because if you take with the f rook, Nc2 wins the exchange for black and black has a rook and the pawn for 2 pieces.
Puzzling... which rook?
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Take with the a rook as if you take with the f rook then Nc2 traps your a rook
This is from a puzzle in Survival yesterday... White's final move is to capture the bishop... which rook would you use?