Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. Bf4 e6 3. Nf3 Nd5 4. Bg3 h5 5. h3 h4 6. Bh2 Be7 7. Nbd2 O-O 8. e4
Nf6 9. e5 Ne8 10. Bd3 d5 11. O-O g6 12. c3 c5 13. Rc1 Nc6 14. Re1 cxd4 15. Nxd4
Ng7 16. N2f3 Bg5 17. Nxg5 Qxg5 18. Nf3 Qe7 19. Bf4 Nh5 20. Bg5 Qd7 21. Bxh4 Ne7
22. Nd4 Nf5 23. Bxf5 exf5 24. Qf3 Kg7 25. Rcd1 Kh7 26. Kf1 b6 27. a3 Ba6+ 28.
Kg1 Rae8 29. Nb3 Ng7 30. Rxd5 Qe6 31. Red1 Bc4 32. Rd6 Qc8 33. Nd4 Rxe5 34. Bf6
Re4 35. Rc6 Qe8 36. Rxc4 Ne6 37. Nxe6 Qxe6 38. Rcd4 Qxf6 39. Rd6 Qe5 40. R1d5 *
Position (FEN): 5r2/p4p1k/1p1R2p1/3Rqp2/4r3/P1P2Q1P/1P3PP1/6K1 b - - 3 40
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 811
Best move: Re1#