Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. Bf4 d6 3. e3 Bf5 4. c3 Nbd7 5. Nd2 e5 6. dxe5 dxe5 7. Bg3 Be7 8.
Bc4 O-O 9. Ne2 c6 10. O-O b5 11. Bb3 a5 12. Nf3 e4 13. Nfd4 Bg4 14. Nxc6 Qe8
15. Nxe7+ Qxe7 16. Bd6 Bxe2 17. Qd2 Qe8 18. Qxe2 a4 19. Bc2 Nb6 20. Bxe4 Nxe4
21. Bxf8 Kxf8 22. Rad1 Nc4 23. Rd4 Rd8 24. Rxd8 Qxd8 25. Qh5 Qg5 26. Qxh7 Nxe3
27. fxe3 Qxe3+ 28. Kh1 Nf2+ 29. Kg1 Nh3+ 30. Kh1 Qg1+ 31. Rxg1 *
Position (FEN): 5k2/5ppQ/8/1p6/p7/2P4n/PP4PP/6RK b - - 0 31
Black to move.
Themes:  Endgame Mate in 1, Smothered Mate 
Puzzle rating: 821
Best move: Nf2#