Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Classical_Variation
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. Nxe5 Nxe5 5. d4 Bb4+ 6. c3 Bxc3+ 7. bxc3 Ng6
8. O-O c6 9. Bc4 Nf6 10. Bg5 O-O 11. e5 d5 12. Bb3 h6 13. exf6 hxg5 14. fxg7
Kxg7 15. Nd2 Rh8 16. Nf3 f6 17. Bc2 Bg4 18. Qd3 *
Position (FEN): r2q3r/pp4k1/2p2pn1/3p2p1/3P2b1/2PQ1N2/P1B2PPP/R4RK1 b - - 3 18
Black to move.
Themes:  Middlegame  
Puzzle rating: 1481
Best move: Nf4