Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3 d5 5. a3 Bxc3+ 6. bxc3 c5 7. cxd5 Nxd5 8.
dxc5 Qa5 9. e4 Ne7 10. Be3 O-O 11. Qb3 Qc7 12. Bb5 Nec6 13. Ne2 Na5 14. Qc2
Nbc6 15. O-O b6 16. cxb6 axb6 17. Rfd1 Ne5 18. Kh1 Nec4 19. Bf4 e5 20. Bc1 Be6
21. f4 f6 22. Rb1 Qc5 23. a4 Rac8 24. f5 Bf7 25. Rd7 Qf2 26. Nd4 *
Position (FEN): 2r2rk1/3R1bpp/1p3p2/nB2pP2/P1nNP3/2P5/2Q2qPP/1RB4K b - - 4 26
Black to move.
Themes:  Middlegame Back Rank Mate, Mate in 1 
Puzzle rating: 800
Best move: Qe1#