Chess puzzle (Advantage)
Opening: Four_Knights_Game, Four_Knights_Game_Spanish_Variation
Moves: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bc5 5. d3 d6 6. Bg5 h6 7. Bh4 g5 8. Bg3
Bd7 9. Qd2 Qe7 10. h4 g4 11. Nh2 h5 12. Nf1 O-O-O 13. Ne3 a6 14. Bc4 Be6 15.
Ncd5 Bxd5 16. Nxd5 Nxd5 17. Bxd5 Nd4 18. f4 *
Position (FEN): 2kr3r/1pp1qp2/p2p4/2bBp2p/3nPPpP/3P2B1/PPPQ2P1/R3K2R b KQ f3 0 18
Black to move.
Themes:  Middlegame  En Passant
Puzzle rating: 1949
Best move: gxf3