Often, there's nothing to do: We depend on luck! Cheering for the opponent not to see our trap, and it's not every day that we beat a GM like that! How does white win?
1... gxh2+ 2. Kxh2 (Kh1, Qxg2#), Qxg2#
gxh7! then, whether kxh7 or kh8, qxg7 is checkmate
Often, there's nothing to do: We depend on luck! Cheering for the opponent not to see our trap, and it's not every day that we beat a GM like that! How does white win?