Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. Bf4 Nc6 3. e3 Bf5 4. c3 Nf6 5. Bd3 Bg4 6. Nf3 e6 7. Nbd2 Bd6 8. Bg3
Bxg3 9. hxg3 Qd6 10. Qc2 a6 11. Bxh7 O-O-O 12. O-O-O g6 13. Ng5 Bxd1 14. Qxd1
Qe7 15. Ndf3 Nh5 16. g4 Nf6 17. Ne5 Nxe5 18. dxe5 Nxg4 19. Qxg4 Qd7 20. Qf4
Rdf8 21. Qf6 Qa4 22. Kb1 Rd8 23. Nxf7 Rdf8 24. Qxe6+ Kb8 25. Nxh8 Rxh8 26. Qf6
Rxh7 27. Rxh7 *
Position (FEN): 1k6/1pp4R/p4Qp1/3pP3/q7/2P1P3/PP3PP1/1K6 b - - 0 27
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 815
Best move: Qd1#