Chess puzzle (Checkmate)
Moves: 1. e3 c5 2. Bc4 e6 3. d4 cxd4 4. Qxd4 Nc6 5. Qd1 Nf6 6. Bd2 Be7 7. Bc3 O-O 8.
Nf3 d5 9. Bb3 a6 10. a3 b5 11. Nbd2 b4 12. axb4 Nxb4 13. Ne5 Bb7 14. Ng4 Nxg4
15. Qxg4 g6 16. Bxb4 Bxb4 17. Qxb4 d4 18. Qxb7 dxe3 19. fxe3 a5 20. Ne4 Qh4+
21. Nf2 Qg5 22. O-O Qxe3 23. Qf3 Qc5 24. Qc3 Qb6 25. Kh1 Rfc8 26. Qf3 Rf8 27.
Ne4 Qd4 28. Nf6+ Kg7 29. Qc3 Qxc3 30. bxc3 Rfc8 31. c4 Rc5 32. Nd7 Rc7 33. Ne5
f6 34. Ng4 e5 35. Nxf6 Rf7 36. Ne8+ Rxe8 37. Rxf7+ Kxf7 38. Rxa5 e4 39. c5+ Kg7
40. Bc4 e3 41. c6 e2 42. Bxe2 Rxe2 43. c7 *
Position (FEN): 8/2P3kp/6p1/R7/8/8/2P1r1PP/7K b - - 0 43
Black to move.
Themes:  Endgame, Rook Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 532
Best move: Re1#