Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nc3 d6 6. Nf3 Nc6 7. O-O Bf5 8. d5
Na5 9. Nd2 c5 10. e4 Bd7 11. Rb1 a6 12. b3 e5 13. Bb2 b5 14. Qc2 Rb8 15. Nd1
Ng4 16. h3 Nh6 17. Ne3 f5 18. f4 exf4 19. Bxg7 Kxg7 20. gxf4 fxe4 21. Nxe4 Nf5
22. Nxf5+ Bxf5 23. Qc3+ Kg8 24. Rbe1 bxc4 25. bxc4 Bxe4 26. Rxe4 Qf6 27. Qxa5
Rb2 28. Qxa6 Qh4 29. Qxd6 Qg3 30. Qe6+ Rf7 31. Re2 Rxe2 32. Qxe2 Rxf4 33. Rxf4
Qxf4 34. Qe8+ Kg7 35. Qe7+ Kh6 36. d6 Qc1+ 37. Kf2 Qf4+ 38. Bf3 Qh2+ 39. Ke3
Qg1+ 40. Ke4 *
Position (FEN): 8/4Q2p/3P2pk/2p5/2P1K3/5B1P/P7/6q1 b - - 8 40
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 1604
Best move: Qd4#