Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. Nf3 d5 3. e3 c5 4. c4 e6 5. Nc3 cxd4 6. Nxd4 Nc6 7. cxd5 Nxd5 8.
Nxd5 Qxd5 9. a3 Nxd4 10. Qxd4 Qxd4 11. exd4 Be7 12. Bb5+ Bd7 13. Bxd7+ Kxd7 14.
Be3 Bf6 15. b4 a5 16. O-O Ke7 17. Rab1 a4 18. b5 Rhd8 19. Rfd1 Rd5 20. Rb4 Kd7
21. h3 Kc7 22. Rc1+ Kb6 23. Rc5 Ra5 24. g3 Be7 25. Rxd5 exd5 26. Rb1 Rxb5 27.
Ra1 Rb3 28. Bc1 Kb5 29. Kf1 Kc4 30. Ke2 b5 31. h4 Bf6 32. Be3 Bxd4 33. Bxd4
Kxd4 34. Kd2 Rb2+ 35. Ke1 Kc3 36. Rd1 d4 37. Ra1 d3 38. Kd1 d2 39. h5 Rc2 40.
Rb1 Rc1+ 41. Rxc1+ dxc1=R+ 42. Kxc1 Kb3 43. Kb1 Kxa3 44. Ka1 b4 45. Kb1 b3 46.
Ka1 b2+ 47. Kb1 Kb3 48. h6 a3 49. hxg7 h5 50. g8=Q *
Position (FEN): 6Q1/5p2/8/7p/8/pk4P1/1p3P2/1K6 b - - 0 50
Black to move.
Themes: Advanced Pawn Endgame, Queen Endgame Mate in 1 
Puzzle rating: 1145
Best move: a2#