Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Marshall_Defense
Moves: 1. d4 d5 2. c4 Nf6 3. cxd5 Qxd5 4. Nc3 Qd8 5. e4 Bg4 6. Qb3 b6 7. Bc4 e6 8. h3
Bh5 9. d5 Bc5 10. Bb5+ c6 11. dxc6 O-O 12. Bg5 h6 13. Bxf6 *
Position (FEN): rn1q1rk1/p4pp1/1pP1pB1p/1Bb4b/4P3/1QN4P/PP3PP1/R3K1NR b KQ - 0 13
Black to move.
Themes:  Middlegame  
Puzzle rating: 1091
Best move: Qxf6