Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Morphy_Defense
Moves: 1. e4 e5 2. Nf3 Nf6 3. Bc4 Nc6 4. Bb5 a6 5. Bxc6 dxc6 6. d3 Bd6 7. Bg5 h6 8.
Bh4 g5 9. Bg3 Qe7 10. h4 gxh4 11. Rxh4 Bg4 12. Nbd2 O-O-O 13. a3 h5 14. c4 Nd7
15. Qa4 Nc5 16. Qc2 Qf6 17. Nb3 Bxf3 18. gxf3 Qxf3 19. Nd2 Qg4 *
Position (FEN): 2kr3r/1pp2p2/p1pb4/2n1p2p/2P1P1qR/P2P2B1/1PQN1P2/R3K3 w Q - 2 20
White to move.
Themes:  Middlegame  
Puzzle rating: 1114
Best move: Rxg4