Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Bird_Variation
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nd4 4. Nxd4 exd4 5. O-O Bc5 6. d3 a5 7. a4 Ne7 8. f4
c6 9. Bc4 Qb6 10. Qg4 O-O 11. f5 d5 12. exd5 cxd5 13. Bb3 Qf6 14. Nd2 Bxf5 15.
Qg3 Bd6 16. Qf2 Qg6 17. Nf3 Qh5 18. Bd2 Bg4 19. h3 Nf5 *
Position (FEN): r4rk1/1p3ppp/3b4/p2p1n1q/P2p2b1/1B1P1N1P/1PPB1QP1/R4RK1 w - - 1 20
White to move.
Themes:  Middlegame  
Puzzle rating: 1346
Best move: hxg4