Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Najdorf_Variation
Moves: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Rg1 e5 7. Nb3 Be6 8. g4
h6 9. h4 Be7 10. g5 hxg5 11. hxg5 Nfd7 12. Be3 Nc6 13. Qd2 a5 14. Nb5 Nf8 15.
O-O-O a4 16. Na1 Bxa2 17. Nxd6+ Bxd6 18. Qxd6 Ne6 *
Position (FEN): r2qk2r/1p3pp1/2nQn3/4p1P1/p3P3/4B3/bPP2P2/N1KR1BR1 w kq - 1 19
White to move.
Themes:  Middlegame  
Puzzle rating: 1963
Best move: Qa3