Chess puzzle (Advantage)
Opening: Benko_Gambit, Benko_Gambit_Other_variations
Moves: 1. d4 Nf6 2. c4 c5 3. d5 b5 4. e3 bxc4 5. Bxc4 g6 6. Nc3 d6 7. Nf3 Bg7 8. Qc2
O-O 9. e4 Ba6 10. Nb5 *
Position (FEN): rn1q1rk1/p3ppbp/b2p1np1/1NpP4/2B1P3/5N2/PPQ2PPP/R1B1K2R b KQ - 2 10
Black to move.
Themes:  Middlegame  
Puzzle rating: 1450
Best move: Bxb5