Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Berlin_Defense
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. Re1 Bd7 6. c3 a6 7. Ba4 Be7 8. d4
O-O 9. Nbd2 b5 10. Bc2 Bg4 11. h3 Bh5 12. g4 Bg6 13. Nh4 Nxg4 *
Position (FEN): r2q1rk1/2p1bppp/p1np2b1/1p2p3/3PP1nN/2P4P/PPBN1P2/R1BQR1K1 w - - 0 14
White to move.
Themes:  Middlegame  
Puzzle rating: 1727
Best move: Nxg6