Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. cxd5 Nxd5 7. Bxe7 Nxe7 8.
Bd3 Nbc6 9. Nf3 Nd5 10. e4 Nf4 11. Bc2 Nxg2+ 12. Kf1 Nf4 13. Rg1 e5 14. d5 Bh3+
15. Ke1 Nb4 16. Nxe5 Nxc2+ 17. Qxc2 Re8 18. Nd3 Nxd5 19. Kd2 Nb4 20. Qb1 c5 21.
a3 Nxd3 22. Qxd3 Qxd3+ 23. Kxd3 Rad8+ 24. Kc2 f5 25. Rg3 Bg4 26. h3 Bh5 27.
exf5 b5 28. Rag1 g6 29. Nxb5 Re2+ 30. Kc3 a6 31. Nc7 Rdd2 32. Nxa6 Rc2+ 33. Kb3
Rxb2+ 34. Ka4 Re4+ 35. Ka5 Be2 36. a4 Bxa6 37. Kxa6 *
Position (FEN): 6k1/7p/K5p1/2p2P2/P3r3/6RP/1r3P2/6R1 b - - 0 37
Black to move.
Themes:  Endgame, Rook Endgame Mate in 1 
Puzzle rating: 914
Best move: Rxa4#