Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Classical_Variation
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. O-O d6 5. Nc3 a6 6. Ba4 Nf6 7. Re1 b5 8. Bb3
Bg4 9. h3 Bh5 10. d3 Nd4 11. Bd5 Rb8 12. g4 Nxg4 13. hxg4 *
Position (FEN): 1r1qk2r/2p2ppp/p2p4/1pbBp2b/3nP1P1/2NP1N2/PPP2P2/R1BQR1K1 b k - 0 13
Black to move.
Themes:  Middlegame  
Puzzle rating: 1365
Best move: Bxg4