Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Zukertort_Variation
Moves: 1. d4 d5 2. Nf3 Bf5 3. h3 Nf6 4. Bf4 e6 5. e3 c6 6. a3 Bd6 7. Bxd6 Qxd6 8. c4
Ne4 9. c5 Qc7 10. Nh4 Ng3 11. Rg1 Bxb1 12. Rxb1 Nxf1 13. Kxf1 Nd7 14. Qg4 g6
15. Nf3 O-O-O 16. b4 h5 17. Qg5 b6 18. Ne5 *
Position (FEN): 2kr3r/p1qn1p2/1pp1p1p1/2PpN1Qp/1P1P4/P3P2P/5PP1/1R3KR1 b - - 1 18
Black to move.
Themes:  Middlegame  
Puzzle rating: 1138
Best move: f6