Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Modern_Variation
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Bb4 5. e3 O-O 6. Nf3 h6 7. Bh4 Nbd7 8. Qb3
a5 9. a3 dxc4 10. Bxc4 Bxc3+ 11. Qxc3 Nb6 12. Bb3 a4 13. Ba2 c6 14. Rc1 Nbd5
15. Qc2 Qa5+ 16. Nd2 b6 17. Bxf6 Nxf6 18. Qxc6 *
Position (FEN): r1b2rk1/5pp1/1pQ1pn1p/q7/p2P4/P3P3/BP1N1PPP/2R1K2R b K - 0 18
Black to move.
Themes: Defensive Move Middlegame  
Puzzle rating: 2060
Best move: Ba6