Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 5. Nf3 cxd4 6. Nxd4 Nc6 7. e3 O-O 8.
Bd3 d5 9. cxd5 Nxd4 10. exd4 Qxd5 11. Be3 Qxg2 12. O-O-O Qc6 13. Rhg1 Bd7 14.
Bh6 Ne8 15. Bxh7+ Kh8 16. Be4 Qc7 17. Qd2 g6 18. Bxf8 Bxf8 19. Qe3 Nf6 20. Bxg6
fxg6 21. Rxg6 Bg7 22. Rdg1 Bc6 23. Qh3+ Nh7 24. Rxg7 Qf4+ 25. Kb1 Be4+ 26. Ka1
Bf5 27. Qg3 Qxg3 28. R7xg3 Rd8 29. Re3 Nf6 30. d5 Nxd5 31. Nxd5 Rxd5 32. Rb3 b6
33. Rb4 Bh7 34. a3 Rd2 35. Rf4 Rd8 36. a4 a5 37. Rf7 Bf5 38. Rb7 Rd6 39. Rf7
Rd4 40. Rf6 *
Position (FEN): 7k/8/1p2pR2/p4b2/P2r4/8/1P3P1P/K5R1 b - - 7 40
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 780
Best move: Rxa4#