Chess puzzle (Advantage)
Opening: Kings_Knight_Opening, Kings_Knight_Opening_Normal_Variation
Moves: 1. e4 e5 2. Nf3 Nc6 3. a3 Bc5 4. Bc4 Nf6 5. d3 d6 6. h3 h6 7. Nc3 O-O 8. Na4
Bb6 9. Nxb6 axb6 10. O-O Ne7 11. Nh2 Ng6 12. Qf3 Be6 13. Bxe6 fxe6 14. Qg3 Qe8
15. Ng4 Nh5 16. Qe3 Nhf4 17. Qg3 Qe7 18. Bxf4 *
Position (FEN): r4rk1/1pp1q1p1/1p1pp1np/4p3/4PBN1/P2P2QP/1PP2PP1/R4RK1 b - - 0 18
Black to move.
Themes:  Middlegame  
Puzzle rating: 1807
Best move: exf4