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. Bg5 e6 7. f4 Be7 8. Qf3
Qc7 9. O-O-O Nbd7 10. g4 b5 11. Bxb5 *
Position (FEN): r1b1k2r/2qnbppp/p2ppn2/1B4B1/3NPPP1/2N2Q2/PPP4P/2KR3R b kq - 0 11
Black to move.
Themes:  Middlegame  
Puzzle rating: 1175
Best move: axb5