Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_London_System
Moves: 1. d4 d5 2. Bf4 Nf6 3. Nf3 Nc6 4. e3 Bg4 5. Bd3 e5 6. dxe5 Ne4 7. h3 Bh5 8. g4
Bg6 9. Nbd2 Bb4 10. Qe2 Qe7 11. O-O-O O-O-O 12. Kb1 Nc5 13. Bxg6 hxg6 14. Bg5 *
Position (FEN): 2kr3r/ppp1qpp1/2n3p1/2npP1B1/1b4P1/4PN1P/PPPNQP2/1K1R3R b - - 1 14
Black to move.
Themes:  Middlegame  
Puzzle rating: 1390
Best move: f6