Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Zukertort_Variation
Moves: 1. Nf3 d5 2. d4 g6 3. g3 Bg7 4. Bg2 Nf6 5. Bg5 h6 6. Be3 O-O 7. O-O Be6 8. Re1
Qd7 9. c3 Ne4 10. Ne5 Qc8 11. Nd2 Kh7 12. Nxe4 dxe4 13. Bxe4 c6 14. Bf4 f5 15.
Bf3 g5 16. Bd2 Bxe5 17. dxe5 Nd7 18. e4 *
Position (FEN): r1q2r2/pp1np2k/2p1b2p/4Ppp1/4P3/2P2BP1/PP1B1P1P/R2QR1K1 b - - 0 18
Black to move.
Themes:  Middlegame  
Puzzle rating: 2397
Best move: f4