Chess puzzle (Checkmate)
Moves: 1. e4 d6 2. Nf3 Nf6 3. Nc3 e5 4. Bc4 c6 5. O-O b5 6. Bb3 b4 7. Ne2 Nxe4 8. d4
exd4 9. Nexd4 Be7 10. Re1 Nf6 11. Qe2 a6 12. Ba4 Bd7 13. Bf4 Kf8 14. Rad1 Nd5
15. Bg3 Nb6 16. Bb3 c5 17. Ne6+ fxe6 18. Bxe6 Nc6 19. Bxd6 Be8 20. Bxc5 Bxc5
21. Rxd8 Rxd8 22. Ne5 Nd4 23. Qe4 Nxe6 24. Qf5+ Ke7 25. Nd3 Rxd3 26. cxd3 Nd7
27. Qxe6+ Kd8 28. Rc1 Rf8 29. Rc2 Rf6 30. Qd5 Bb6 31. Qa8+ Ke7 32. Qe4+ Kf8 33.
Qxb4+ Bc5 34. Rxc5 Nxc5 35. Qxc5+ Kf7 36. Qd5+ Re6 37. Qf5+ Ke7 38. Qc5+ Kf6
39. Qd4+ Ke7 40. Qf4 *
Position (FEN): 4b3/4k1pp/p3r3/8/5Q2/3P4/PP3PPP/6K1 b - - 10 40
Black to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 832
Best move: Re1#