Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Marshall_Defense
Moves: 1. d4 d5 2. c4 Nf6 3. cxd5 Nxd5 4. e4 Nf6 5. Nc3 Nc6 6. Bb5 Bg4 7. Nf3 a6 8.
Ba4 b5 9. Bb3 Nxd4 *
Position (FEN): r2qkb1r/2p1pppp/p4n2/1p6/3nP1b1/1BN2N2/PP3PPP/R1BQK2R w KQkq - 0 10
White to move.
Themes:  Middlegame  
Puzzle rating: 1375
Best move: Qxd4