Chess puzzle (Checkmate)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 d5 7. dxe5 b5 8. Bb3
Be6 9. Nbd2 Nc5 10. a4 Nxb3 11. Nxb3 Rb8 12. axb5 axb5 13. Nbd4 Nxd4 14. Nxd4
Bd7 15. Be3 Be7 16. Qd3 O-O 17. f4 c5 18. Nf3 d4 19. Bd2 Be6 20. b4 Bc4 21. Qe4
Bxf1 22. Kxf1 h6 23. bxc5 Bxc5 24. Ke2 f5 25. Qc6 Qb6 26. Qxb6 Bxb6 27. Kd3
Rfd8 28. Bb4 Kf7 29. Bd6 Rbc8 30. Ra6 Bc5 31. Bxc5 Rxc5 32. Nxd4 Rcd5 33. c3 b4
34. Ra4 bxc3 35. Kxc3 Kg6 36. Ra6+ Kh5 37. Nxf5 Rc8+ 38. Kb4 Rd2 39. Nxg7+ Kg4
40. Rxh6 Rb2+ 41. Ka3 Rb1 42. Ka2 Rb7 43. Ra6 Kxf4 44. Ne6+ Ke3 45. Ra3+ Kf2
46. Nf4 Rc2+ 47. Ka1 Rd7 48. Rb3 Rd1+ 49. Rb1 Rd4 50. g3 *
Position (FEN): 8/8/8/4P3/3r1N2/6P1/2r2k1P/KR6 b - - 0 50
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 879
Best move: Ra4#