Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Steinitz_Defense
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 exd4 5. Nxd4 Bd7 6. Nc3 Nf6 7. O-O Be7 8.
Re1 Ne5 9. Bxd7+ Qxd7 10. Bg5 O-O-O 11. f4 Ng6 12. Nd5 Nxd5 13. exd5 Bxg5 14.
fxg5 Rde8 15. Rf1 Re5 16. Nf3 Re4 17. Nd2 Rg4 18. Qf3 *
Position (FEN): 2k4r/pppq1ppp/3p2n1/3P2P1/6r1/5Q2/PPPN2PP/R4RK1 b - - 8 18
Black to move.
Themes:  Middlegame  
Puzzle rating: 1945
Best move: Nh4