Came across this nice tactic during an analysis of a game I had.
This position was not reached during the game, but I found it very instructional, since it is not a straightforward mate in 2 (at least not for me).
Thought process on how to see this mate in 2:
- Look at the moves that our opponent's king has available.
- See that moving our king to f6 will restrict our opponent's king completely and he will only have one legal move (h5)
- This eliminates the defender of g5 and we can proceed to deliver check mate g5#
