Chess puzzle (Checkmate)
Moves: 1. c4 g6 2. e3 Bg7 3. Nf3 e5 4. d4 e4 5. Nfd2 f5 6. Nc3 Nf6 7. h4 h5 8. f3 exf3
9. Qxf3 Nc6 10. Qg3 Ng4 11. Be2 d6 12. Bxg4 hxg4 13. d5 Be5 14. Qf2 Nb4 15. Kd1
g3 16. Qe2 Rxh4 17. Rf1 a5 18. Nf3 Rg4 19. Nxe5 dxe5 20. a3 Na6 21. e4 Nc5 22.
exf5 Rd4+ 23. Kc2 Qf6 24. Kb1 Bxf5+ 25. Ka2 O-O-O 26. Be3 Qb6 27. Bxd4 *
Position (FEN): 2kr4/1pp5/1q4p1/p1nPpb2/2PB4/P1N3p1/KP2Q1P1/R4R2 b - - 0 27
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 865
Best move: Qb3#