Chess puzzle (Checkmate)
Moves: 1. d4 e6 2. c4 f5 3. Nc3 Nf6 4. Nf3 d6 5. Bg5 Be7 6. e3 b6 7. Be2 Bb7 8. O-O
O-O 9. Re1 Qe8 10. Rc1 Nc6 11. d5 Nd8 12. Qc2 Nf7 13. dxe6 Nxg5 14. Nxg5 Ne4
15. Ngxe4 fxe4 16. Nxe4 Qg6 17. Ng3 Qxe6 18. Red1 Bh4 19. Bd3 g6 20. Be4 Bxg3
21. Bxb7 Bxf2+ 22. Qxf2 Rxf2 23. Bd5 Qxd5 24. cxd5 Rf7 25. Rd4 Re8 26. e4 Re5
27. Rdc4 Ree7 28. a4 Kf8 29. b4 Ke8 30. a5 b5 31. Rc6 Kd8 32. Ra6 Rxe4 33. Rxa7
Rxb4 34. a6 Ra4 35. Ra8+ Kd7 36. a7 Rf5 37. Rh8 Rxa7 38. Rxh7+ Kc8 39. Rh8+ Kb7
40. Rh7 Kb6 41. Rc6+ Ka5 42. Rxd6 Kb4 43. Rxg6 *
Position (FEN): 8/r1p4R/6R1/1p1P1r2/1k6/8/6PP/6K1 b - - 0 43
Black to move.
Themes:  Endgame, Rook Endgame Mate in 1 
Puzzle rating: 928
Best move: Ra1#