Chess puzzle (Advantage)
Opening: Rat_Defense, Rat_Defense_Small_Center_Defense
Moves: 1. e4 e6 2. d4 d6 3. Nf3 b6 4. c4 Bb7 5. Nc3 Be7 6. Bg5 *
Position (FEN): rn1qk1nr/pbp1bppp/1p1pp3/6B1/2PPP3/2N2N2/PP3PPP/R2QKB1R b KQkq - 4 6
Black to move.
Themes:  Opening  
Puzzle rating: 712
Best move: Bxg5