Chess puzzle (Advantage)
Opening: Modern_Defense, Modern_Defense_Other_variations
Moves: 1. e4 g6 2. d4 Bg7 3. Be3 e6 4. Bc4 Ne7 5. c3 O-O 6. h4 c6 7. h5 b5 8. h6 Bh8
9. Bb3 d5 10. Nd2 a5 11. a4 Ba6 12. Bg5 f6 13. Be3 Nd7 14. Qg4 f5 15. exf5 exf5
16. Qg3 Bf6 17. Ndf3 Kh8 18. Bf4 Rg8 19. Bg5 Bxg5 *
Position (FEN): r2q2rk/3nn2p/b1p3pP/pp1p1pb1/P2P4/1BP2NQ1/1P3PP1/R3K1NR w KQ - 0 20
White to move.
Themes:  Middlegame  
Puzzle rating: 1639
Best move: Nxg5