Chess puzzle (Advantage)
Opening: Vienna_Game, Vienna_Game_Mengarini_Variation
Moves: 1. e4 e5 2. a3 Nf6 3. Nc3 Nc6 4. Bc4 Bc5 5. d3 d6 6. Na4 Bb6 7. Nxb6 axb6 8.
Nf3 O-O 9. Ng5 d5 10. exd5 Nxd5 11. Ne4 Be6 12. Ng5 Qf6 13. Nxe6 fxe6 14. O-O
Nce7 15. Ba2 Ng6 16. c4 Ndf4 17. Qf3 Qg5 18. Bxf4 Rxf4 19. Qg3 *
Position (FEN): r5k1/1pp3pp/1p2p1n1/4p1q1/2P2r2/P2P2Q1/BP3PPP/R4RK1 b - - 1 19
Black to move.
Themes:  Middlegame  
Puzzle rating: 1240
Best move: Rg4