Mate Puzzle (1289)

After the setup move Kxa1, it is Black to move. Find the forcing continuation before checking the solution.

Position after Kxa1. Black to move.

Puzzle ID

0GmRR

Rating

1289

Side to move

Black

Themes

Mate, Mate in 3, Middlegame

Material

White is ahead by 7 points

FEN

1n1qk3/1p3p2/2p2p1B/4P3/7P/1bP3N1/1P1Q1P1P/K3R3 b - - 0 25

What to look for

Calculate a forcing checkmate sequence.

25... Qa5+ 26. Kb1 26... Qa2+ 27. Kc1 27... Qa1#

The full forcing line from the source position is:

25. Kxa1 25... Qa5+ 26. Kb1 26... Qa2+ 27. Kc1 27... Qa1#