Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. e3 dxc4 5. Nf3 Bb4 6. Bxc4 Ne4 7. Bd2 Nxd2 8.
Qxd2 Qf6 9. a3 Bxc3 10. Qxc3 Nc6 11. Be2 O-O 12. O-O b6 13. Bd3 Bb7 14. Qc2 g6
15. Be4 Na5 16. Bxb7 Nxb7 17. Qxc7 Rac8 18. Qg3 Rc2 19. b4 Rd8 20. Rfc1 Rxc1+
21. Rxc1 Kg7 22. Qe5 Qxe5 23. Nxe5 Nd6 24. Rc7 a5 25. g3 axb4 26. axb4 Ra8 27.
Rc6 Ne4 28. Rxb6 Ra2 29. Nd3 Rd2 30. Nc5 Nxf2 31. Rb7 Nh3+ 32. Kf1 Rxh2 33.
Nxe6+ Kf6 34. Nf4 Ng5 35. Rb6+ Kg7 36. d5 Ne4 37. Kg1 Rb2 38. b5 Rb1+ 39. Kg2
Rb2+ 40. Kf3 f5 41. Rb7+ Kh6 42. b6 *
Position (FEN): 8/1R5p/1P4pk/3P1p2/4nN2/4PKP1/1r6/8 b - - 0 42
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 900
Best move: Ng5#