The answer is for white to first play d4. If black plays K-h5, white responds with Q-d3. Black is then forced to play either K-h4 or K-g4. Regardless, white plays Q-h3 and it’s checkmate.
The other alternative after white’s opening move of d4 is for black to play K-g4, instead of the original K-h5, as in the first example. If that’s the case, white simply plays e4, check. Black is now forced to play K-h4 and white checkmates with g3.
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