Find the decisive blow (difficulty 1590)

87654321 abcdefgh

White to move

Show solution
87654321 abcdefgh
  1. e2–d3 key move
  2. f7–e6
  3. e1–e2

What makes it

The pawn strikes, a queen given up, and the attack wins. 24 half-moves of forced play. At 1590, punishing to calculate.