Chess puzzle (Checkmate)
Moves: 1. e4 c5 2. Nc3 Nc6 3. Nf3 e5 4. Bc4 Be7 5. d3 Nf6 6. Be3 d6 7. a3 O-O 8. h3 a6
9. Qd2 b5 10. Ba2 Bb7 11. Nd5 Nd4 12. Nxf6+ Bxf6 13. Nxd4 exd4 14. Bh6 gxh6 15.
Qxh6 Bg7 16. Qh5 d5 17. e5 Qe7 18. O-O-O Qxe5 19. Qg4 Rae8 20. Rhe1 Qf6 21. f3
Re6 22. Qg3 Rfe8 23. Rxe6 Qxe6 24. Qc7 Qe2 25. Rh1 Bh6+ 26. Kb1 Qe1+ 27. Rxe1 *
Position (FEN): 4r1k1/1bQ2p1p/p6b/1ppp4/3p4/P2P1P1P/BPP3P1/1K2R3 b - - 0 27
Black to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 600
Best move: Rxe1#