Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Old_Sicilian
Moves: 1. e4 c5 2. Nf3 Nc6 3. Nc3 Qb6 4. Be2 g6 5. Rb1 Bg7 6. d3 *
Position (FEN): r1b1k1nr/pp1pppbp/1qn3p1/2p5/4P3/2NP1N2/PPP1BPPP/1RBQK2R b Kkq - 0 6
Black to move.
Themes:  Opening  
Puzzle rating: 1339
Best move: Bxc3+