Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Symmetrical_Variation
Moves: 1. d4 d5 2. Nf3 Nf6 3. h3 e6 4. Bf4 c5 5. e3 Nc6 6. Bb5 a6 7. Nc3 *
Position (FEN): r1bqkb1r/1p3ppp/p1n1pn2/1Bpp4/3P1B2/2N1PN1P/PPP2PP1/R2QK2R b KQkq - 1 7
Black to move.
Themes:  Opening  
Puzzle rating: 1036
Best move: axb5