Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. c4 e6 3. Nc3 dxc4 4. e3 Bb4 5. Bd2 Bxc3 6. Bxc3 b5 7. a4 c6 8. axb5
cxb5 9. Qf3 Qd5 10. Be2 Bb7 11. Qxd5 Bxd5 12. Bf3 Bxf3 13. Nxf3 Nf6 14. Ne5 O-O
15. O-O Nfd7 16. Nxd7 Nxd7 17. Ra5 a6 18. Rfa1 Nb8 19. Bb4 Rd8 20. Be7 Rd7 21.
Bc5 f6 22. Kf1 Kf7 23. Ke2 e5 24. Kf3 Ke6 25. Ke4 exd4 26. exd4 g5 27. g3 f5+
28. Ke3 Kd5 29. f4 h6 30. fxg5 hxg5 31. Rf1 Rf7 32. Raa1 Nd7 33. h4 Re8+ 34.
Kd2 Nxc5 35. dxc5 Kxc5 36. Rxa6 Rd7+ 37. Kc3 Re2 38. Rxf5+ Rd5 39. Rxd5+ Kxd5
40. hxg5 Kc5 41. g6 *
Position (FEN): 8/8/R5P1/1pk5/2p5/2K3P1/1P2r3/8 b - - 0 41
Black to move.
Themes:  Endgame, Rook Endgame Mate in 1 
Puzzle rating: 1513
Best move: b4#