It’s white turn to move. If white and black play optimally, what is the minimum number of moves for white to checkmate the black king? If in your opinion, mate cannot occur, input your answer as
.
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The first move for white is Rh6! . Minimum number of moves is 9 . Here is the solution of the puzzle from my source.
1 . R h 6 + R h 7
2 . R x h 7 + K x h 7
3 . Q f 7 + K h 8
4 . Q e 8 + K h 7
5 . g 6 + K h 6
6 . B f 4 + K h 5
7 . g 7 + K g 4
8 . g 8 = Q + K h 4
9 . B g 3 #