Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. Bf4 g6 3. e3 c5 4. c3 cxd4 5. exd4 Bg7 6. Nd2 O-O 7. Ngf3 Nc6 8.
h3 d6 9. g4 e5 10. dxe5 dxe5 11. Bg3 e4 12. Nh2 Re8 13. Bg2 e3 14. fxe3 Rxe3+
15. Kf2 Rd3 16. Bf4 Qb6+ 17. Ke2 Rd8 18. Qb3 Re8+ 19. Kd1 Qf2 20. Bxc6 bxc6 21.
Nhf3 Ba6 22. Rh2 Qc5 23. Kc2 Nd5 24. Bg5 Rab8 25. Qa3 Nb4+ 26. Kc1 Qg1+ 27.
Nxg1 *
Position (FEN): 1r2r1k1/p4pbp/b1p3p1/6B1/1n4P1/Q1P4P/PP1N3R/R1K3N1 b - - 0 27
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1121
Best move: Re1#