Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Other_variations
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c6 5. Nf3 Nbd7 6. e3 Bb4 7. Bd3 dxc4 8.
Bxc4 Qa5 9. O-O Bxc3 10. bxc3 Qxc3 11. Qe2 Qa5 12. e4 O-O 13. Rfd1 Re8 14. Rac1
h6 15. Bxf6 Nxf6 16. Bd3 a6 17. e5 Nd5 18. Qe4 g6 19. Nh4 Ne7 *
Position (FEN): r1b1r1k1/1p2np2/p1p1p1pp/q3P3/3PQ2N/3B4/P4PPP/2RR2K1 w - - 2 20
White to move.
Themes:  Middlegame  
Puzzle rating: 1780
Best move: Qf4