Find the decisive blow (difficulty 1155)
White to move
Show solution
- b1–b7 key move
- b8–b7
- a1–b1
What makes it
A rook move and a 4-point investment: mate in four. The forced line runs 7 plies. At 1155, no gift.
White to move
A rook move and a 4-point investment: mate in four. The forced line runs 7 plies. At 1155, no gift.