Chess puzzle (Checkmate)
Moves: 1. d4 g6 2. Nf3 Bg7 3. e3 Nf6 4. Be2 O-O 5. O-O c6 6. b3 d5 7. Bb2 Nbd7 8. c4
Re8 9. Nc3 Ne4 10. Nxe4 dxe4 11. Nd2 f5 12. Qc2 h6 13. Rfd1 Kh7 14. g3 e5 15.
d5 cxd5 16. cxd5 Nf6 17. d6 Qxd6 18. Nxe4 Qe7 19. Nd6 Rd8 20. Nc4 Ne4 21. Rxd8
Qxd8 22. Bxe5 Bxe5 23. Nxe5 Be6 24. Rd1 Rc8 25. Qd3 Qxd3 26. Bxd3 Nc3 27. Rd2
Kg7 28. Bc4 Bxc4 29. Nxc4 b5 30. Ne5 Kf6 31. f4 Ne4 32. Rd7 Rc1+ 33. Kg2 Rc2+
34. Kg1 Rc1+ 35. Kg2 Rc2+ 36. Kf1 Rxa2 37. Rf7+ Ke6 38. Rg7 g5 39. Rg6+ Kd5 40.
Rxh6 gxf4 41. gxf4 Nd2+ 42. Ke2 Nxb3+ 43. Kd3 Nc5+ 44. Kc3 a5 45. Rh8 *
Position (FEN): 7R/8/8/ppnkNp2/5P2/2K1P3/r6P/8 b - - 1 45
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 1683
Best move: b4#