Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Dragon_Variation
Moves: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. h3 O-O 8. Qd2
Nc6 9. O-O-O Be6 10. Nb3 a5 11. Kb1 Nb4 12. Bh6 a4 13. Bxg7 *
Position (FEN): r2q1rk1/1p2ppBp/3pbnp1/8/pn2P3/1NN4P/PPPQ1PP1/1K1R1B1R b - - 0 13
Black to move.
Themes:  Middlegame  
Puzzle rating: 1585
Best move: axb3