Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Other_variations
Moves: 1. e4 c5 2. d3 Nc6 3. Nf3 d6 4. Be3 Nf6 5. Be2 e6 6. Nc3 Be7 7. Qd2 O-O 8.
O-O-O Qb6 9. Kb1 Nd4 10. Rdg1 e5 11. Bd1 Bg4 12. h3 Be6 13. g4 Qa5 14. g5 Nh5
15. Ne1 Nf4 16. Bxf4 exf4 17. Qxf4 Rae8 18. Qg3 Bxa2+ *
Position (FEN): 4rrk1/pp2bppp/3p4/q1p3P1/3nP3/2NP2QP/bPP2P2/1K1BN1RR w - - 0 19
White to move.
Themes:  Middlegame  
Puzzle rating: 1054
Best move: Nxa2