Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. g3 Bb4+ 5. Bd2 Bd6 6. Bg2 O-O 7. O-O c6 8. Nc3
Nbd7 9. Qc2 Qe7 10. e4 dxe4 11. Nxe4 Nxe4 12. Qxe4 Nf6 13. Qe2 c5 14. Bc3 Rb8
15. Rfe1 Re8 16. Rad1 cxd4 17. Nxd4 Bd7 18. b3 a6 19. Nf5 exf5 20. Qd3 Ne4 21.
Bxe4 fxe4 22. Qxd6 Qxd6 23. Rxd6 Bg4 24. Rd4 Bf3 25. Rc1 Red8 26. Kf1 Rxd4 27.
Bxd4 Rd8 28. Be3 f6 29. Ke1 g5 30. b4 Kf7 31. c5 Ke6 32. c6 bxc6 33. Rxc6+ Kf5
34. Bd2 Ra8 35. h3 Rd8 36. g4+ Kg6 37. Rxa6 Rc8 38. Be3 Rd8 39. Bd2 Rc8 40. b5
Rc2 41. Rc6 Rxa2 42. Bc3 Re2+ 43. Kf1 h5 44. Rxf6+ Kh7 45. gxh5 Rc2 46. Rc6
Bxh5 47. Kg2 Bf3+ 48. Kg3 Rc1 49. h4 Rg1+ 50. Kh2 Rg2+ 51. Kh3 *
Position (FEN): 8/7k/2R5/1P4p1/4p2P/2B2b1K/5Pr1/8 b - - 4 51
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 1274
Best move: g4#