Chess puzzle (Advantage)
Opening: Zukertort_Opening, Zukertort_Opening_Pirc_Invitation
Moves: 1. Nf3 d6 2. e4 e6 3. d4 Nd7 4. d5 e5 5. Bb5 Ne7 6. Nc3 Ng6 7. O-O Be7 8. Be3
O-O 9. g3 Nb6 10. Bxb6 axb6 11. a4 Bg4 12. Qd3 f5 13. Nd2 f4 14. Nc4 Bd7 15. a5
Bxb5 16. Nxb5 Qd7 17. Nc3 Qh3 18. axb6 *
Position (FEN): r4rk1/1pp1b1pp/1P1p2n1/3Pp3/2N1Pp2/2NQ2Pq/1PP2P1P/R4RK1 b - - 0 18
Black to move.
Themes:  Middlegame  
Puzzle rating: 1772
Best move: f3