Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Nf3 c5 8.
Be2 O-O 9. O-O cxd4 10. cxd4 Nc6 11. Bb2 Bg4 12. e5 Na5 13. Rc1 Be6 14. Qa4 b6
15. Ng5 Bd5 16. Bf3 Bh6 17. h4 Bxg5 18. hxg5 Bxf3 19. gxf3 Qd5 20. Kg2 Rac8 21.
Ba3 Qxa2 22. Rxc8 Rxc8 23. Qd7 Qe6 24. Qxe7 Nc6 25. Qxe6 fxe6 26. Rc1 Ne7 27.
Rxc8+ Nxc8 28. Kf1 Kf7 29. Ke2 Ne7 30. Kd3 Nd5 31. Kc4 a6 32. Bc1 Ke8 33. Ba3
Kd7 34. Bc1 Kc6 35. Bd2 b5+ 36. Kb3 Kb6 37. Bc1 a5 38. Ba3 b4 39. Bc1 Kb5 40.
Be3 a4+ 41. Kb2 Kc4 42. f4 a3+ 43. Ka2 Nc3+ 44. Ka1 b3 45. Bc1 Kb4 46. f3 Ne2
47. d5 Nxc1 48. dxe6 Ne2 49. e7 Nc3 50. e8=Q *
Position (FEN): 4Q3/7p/6p1/4P1P1/1k3P2/ppn2P2/8/K7 b - - 0 50
Black to move.
Themes: Advanced Pawn Endgame Mate in 1 
Puzzle rating: 873
Best move: b2#