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  3. puzzle solution

hi all, im using a single chip computer and it wont do stockfish. why does it matter what square the king goes to ?

here is puzzle:

bothers me that i cant see it even now that i know the answer.

It matters because on the other squares the opponent can sacrifice his rook to help his bishop prevent your pawn from queening.

thank you. its very subtle. i would never get in a game