Intermediate puzzle

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Asamipenta
Who can do this puzzle?
Asamipenta

Black to move

Arisktotle

Sure you got the coordinates right? Sure there aren't like 1000 solutions?

Thunderbolt108

Black king to take rook

jetoba
Thunderbolt108 wrote:

Black king to take rook

1 ... c1=Q seems easiest. (unless Arisktotle is right about a coordinate error).