Find the decisive blow (difficulty 945)

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Black to move

Show solution
12345678 hgfedcba
  1. h8–b2 key move
  2. f4–e6
  3. d7–e6

What makes it

It starts with a queen move and forces mate in three. No check, no capture: just a quiet move, and the defence caves in. At 945, a warm-up.