Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Symmetrical_Variation
Moves: 1. d4 d5 2. Nf3 Nf6 3. Nc3 e6 4. e3 c6 5. Bd2 Bb4 6. Bd3 O-O 7. e4 *
Position (FEN): rnbq1rk1/pp3ppp/2p1pn2/3p4/1b1PP3/2NB1N2/PPPB1PPP/R2QK2R b KQ - 0 7
Black to move.
Themes:  Opening  
Puzzle rating: 1706
Best move: Bxc3