Solution
37… ♛g6+ 38. ♚g4 f5+ 39. ♚f3 ♛h5+ 40. g4 ♛xg4#
The position
This advanced puzzle (rating 2169) asks Black to move to find the winning idea. It features these themes: Mate in 4.
It is Black to move. Look for the tactic hiding in the position — Mate in 4. Drag a piece on the board to play your move; the puzzle will tell you if you found the best continuation.
Take 50,000 puzzles anywhere
Get Chess Puzzles Trainer for iPhone and iPad — the same puzzles, offline, with progress tracking and spaced repetition.