Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Accelerated_London_System
Moves: 1. d4 d5 2. Bf4 b6 3. Nf3 Nf6 4. e3 Ba6 5. Bxa6 Nxa6 6. c3 e6 *
Position (FEN): r2qkb1r/p1p2ppp/np2pn2/3p4/3P1B2/2P1PN2/PP3PPP/RN1QK2R w KQkq - 0 7
White to move.
Themes:  Opening  
Puzzle rating: 1217
Best move: Qa4+