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Above, white is in check from the black rook. He has 3 possible
moves: he can move his king into the corner, place his knight in
front of the king, or capture the rook with his queen.
If a player whose king is in check is unable to move out of check, his
opponent has delivered checkmate (or “mate”), and has won.
In the above diagram, white can deliver checkmate by promoting
his pawn to a queen.