Chess puzzle (Checkmate)
Moves: 1. e4 c5 2. Nf3 d6 3. Bc4 e6 4. O-O Nc6 5. Nc3 Nf6 6. d3 Be7 7. Be3 d5 8. exd5
exd5 9. Bb3 d4 10. Bxd4 Nxd4 11. Nxd4 cxd4 12. Ba4+ Bd7 13. Bxd7+ Qxd7 14. Ne2
O-O 15. c3 dxc3 16. Nxc3 Bb4 17. Rc1 Rfd8 18. Qf3 Qxd3 19. Qxb7 a5 20. Rcd1 Qf5
21. Rxd8+ Rxd8 22. Qb6 Re8 23. Rd1 Bc5 24. Qxa5 Qxf2+ 25. Kh1 Re1+ 26. Rxe1 *
Position (FEN): 6k1/5ppp/5n2/Q1b5/8/2N5/PP3qPP/4R2K b - - 0 26
Black to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 530
Best move: Qxe1#