Find the decisive blow (difficulty 1185)

87654321 abcdefgh

White to move

Show solution
87654321 abcdefgh
  1. h4–h7 key move
  2. g8–h7
  3. e4–f6

What makes it

Mate in three, bought with the queen offered up. The shot starts with the queen. Difficulty 1185: a fair workout.