Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Exchange_Variation
Moves: 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. cxd5 exd5 5. Bg5 c6 6. e3 Be7 7. Bd3 h6 8. Bh4
Nbd7 9. Qc2 O-O 10. Nge2 Re8 11. O-O Nf8 12. f3 Qb6 13. Rad1 Be6 14. Bf2 Rad8
15. Kh1 c5 16. dxc5 Bxc5 *
Position (FEN): 3rrnk1/pp3pp1/1q2bn1p/2bp4/8/2NBPP2/PPQ1NBPP/3R1R1K w - - 0 17
White to move.
Themes:  Middlegame  
Puzzle rating: 1489
Best move: Na4