Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. Bf4 d6 3. Nc3 Nbd7 4. e4 e5 5. dxe5 dxe5 6. Be3 Bb4 7. f3 c6 8. a3
Bc5 9. Bxc5 Nxc5 10. Qxd8+ Kxd8 11. Bc4 Kd7 12. O-O-O+ Ke7 13. Nge2 b5 14. Ba2
a5 15. g4 b4 16. Nb1 Ba6 17. Ng3 g6 18. h4 h5 19. g5 Ne8 20. Rh2 Rd8 21. Rxd8
Kxd8 22. Bxf7 Rf8 23. Bxg6 Rxf3 24. Nxh5 b3 25. Rd2+ Ke7 26. Bxe8 Kxe8 27. Nf6+
Ke7 28. Nc3 bxc2 29. Kxc2 Bd3+ 30. Kc1 Rf1+ 31. Rd1 *
Position (FEN): 8/4k3/2p2N2/p1n1p1P1/4P2P/P1Nb4/1P6/2KR1r2 b - - 4 31
Black to move.
Themes: Pin Endgame Mate in 1 
Puzzle rating: 922
Best move: Nb3#