Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Najdorf_Variation
Moves: 1. e4 c5 2. Nf3 d6 3. Nc3 Nf6 4. d4 cxd4 5. Nxd4 a6 6. h3 e5 7. Nf3 h6 8. Bc4
Nc6 9. Be3 Na5 10. Bd3 Be6 11. Qe2 Rc8 12. Bd2 b5 13. Bxb5+ *
Position (FEN): 2rqkb1r/5pp1/p2pbn1p/nB2p3/4P3/2N2N1P/PPPBQPP1/R3K2R b KQk - 0 13
Black to move.
Themes:  Middlegame  
Puzzle rating: 1290
Best move: axb5