Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_London_System
Moves: 1. d4 d5 2. Bf4 Nf6 3. Nf3 c5 4. e3 e6 5. Nbd2 Nc6 6. c4 cxd4 7. exd4 dxc4 8.
Bxc4 Bb4 9. a3 Bxd2+ 10. Qxd2 O-O 11. O-O Na5 12. Ne5 Nxc4 13. Nxc4 b6 14. Ne5
Bb7 15. Bg5 Qd5 16. f3 Nd7 17. Qf4 *
Position (FEN): r4rk1/pb1n1ppp/1p2p3/3qN1B1/3P1Q2/P4P2/1P4PP/R4RK1 b - - 2 17
Black to move.
Themes:  Middlegame  
Puzzle rating: 1499
Best move: f6