Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Marshall_Defense
Moves: 1. d4 d5 2. c4 Nf6 3. Nc3 dxc4 4. e3 Be6 5. e4 c6 6. Bg5 g6 7. Bxf6 exf6 8. d5
cxd5 9. exd5 Bf5 10. Bxc4 Bb4 *
Position (FEN): rn1qk2r/pp3p1p/5pp1/3P1b2/1bB5/2N5/PP3PPP/R2QK1NR w KQkq - 1 11
White to move.
Themes:  Opening  
Puzzle rating: 1280
Best move: Qa4+