Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 a6 7. e4 b5 8. Qb3
Bb7 9. e5 Nfd7 10. e6 fxe6 11. Qxe6 Bxf3 12. gxf3 Nf8 13. Qe4 Nbd7 14. Bg5 Nb6
15. Bh3 b4 16. Ne2 Nfd7 17. Qe6 Nf6 18. Qc6+ Kf8 19. Nf4 Qd6 20. Qxc7 Ne8 21.
Qb7 e5 22. Ne6+ Kg8 23. O-O h6 24. Be7 Rb8 25. Qa7 Ra8 26. Qxa8 Qxe7 27. Qxa6
Nd7 28. Qc4 Kh7 29. d5 Nd6 30. Qxb4 Rb8 31. Qd2 Bf6 32. a4 e4 33. fxe4 Rxb2 34.
Qf4 Rb4 35. Rfe1 Bxa1 36. Rxa1 Rxe4 37. Qd2 Qf6 38. Rc1 Ne5 39. Rc7+ Ndf7 40.
Bg2 Rxa4 41. h3 Ra1+ 42. Kh2 Kg8 43. Qf4 Qxf4+ 44. Nxf4 Ra2 45. Kg3 Rd2 46. Be4
Kg7 47. Ne6+ Kf6 48. h4 g5 49. h5 g4 50. Nf4 Ng5 51. Bb1 Rd1 52. Bc2 Rg1+ 53.
Kh2 *
Position (FEN): 8/2R5/5k1p/3Pn1nP/5Np1/8/2B2P1K/6r1 b - - 7 53
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 706
Best move: Nef3#