Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Modern_Variation
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Bb4 5. Nf3 b6 *
Position (FEN): rnbqk2r/p1p2ppp/1p2pn2/3p2B1/1bPP4/2N2N2/PP2PPPP/R2QKB1R w KQkq - 0 6
White to move.
Themes:  Middlegame  
Puzzle rating: 1258
Best move: Qa4+