Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 e6 5. b3 Nbd7 6. Bd3 Bd6 7. Bb2 Qe7 8. O-O
O-O 9. Nbd2 b6 10. e4 dxe4 11. Nxe4 Nxe4 12. Bxe4 Bb7 13. Re1 Nf6 14. Bc2 Rfd8
15. Qd3 Bb4 16. Re2 g6 17. a3 Bd6 18. Rae1 Bxa3 19. Bxa3 Qxa3 20. Ng5 c5 21. d5
exd5 22. Qf3 Rd6 23. Nxf7 Kxf7 24. Re7+ Kg8 25. Rxb7 dxc4 26. h4 Rf8 27. Qf4
Qb4 28. Ree7 Qd2 29. Qxc4+ Kh8 30. Rf7 Qe1+ 31. Qf1 Qxf1+ 32. Kxf1 Rxf7 33.
Rxf7 a5 34. f3 Kg8 35. Rb7 Rd7 36. Rxb6 Nd5 37. Rb8+ Kg7 38. Be4 Ne3+ 39. Kf2
Nd1+ 40. Kg3 Nc3 41. Bc6 Re7 42. Ba4 Nxa4 43. bxa4 Re3 44. Rb7+ Kh6 45. Rc7 Ra3
46. Rxc5 Rxa4 47. Kh3 Ra3 48. Kg4 Kg7 49. f4 h5+ 50. Kg5 *
Position (FEN): 8/6k1/6p1/p1R3Kp/5P1P/r7/6P1/8 b - - 1 50
Black to move.
Themes:  Endgame, Rook Endgame Mate in 1 
Puzzle rating: 427
Best move: Rg3#