1. d4 Kh5
If 1... Kg4 then 2. e4+ Kh4 3.g3#
2. Qd3, and
3.Qh3#

Note that h4 is the only place on the board where the black king is mated so quickly.
1. d4 Kh5
If 1... Kg4 then 2. e4+ Kh4 3.g3#
2. Qd3, and
3.Qh3#

Note that h4 is the only place on the board where the black king is mated so quickly.