Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Moscow_Variation
Moves: 1. e4 c5 2. Nf3 d6 3. Bb5+ Nd7 4. O-O a6 5. Bxd7+ Bxd7 6. d4 cxd4 7. Nxd4 Rc8
8. Nc3 e6 9. Be3 g6 10. Qd2 Bg7 11. f4 b5 12. a3 Ne7 13. f5 exf5 14. exf5 Nxf5
15. Nxf5 Bxf5 16. Bh6 O-O 17. Bxg7 Kxg7 18. Qd4+ Qf6 19. Qd2 Kg8 *
Position (FEN): 2r2rk1/5p1p/p2p1qp1/1p3b2/8/P1N5/1PPQ2PP/R4RK1 w - - 4 20
White to move.
Themes:  Middlegame  
Puzzle rating: 2077
Best move: g4