Chess puzzle (Advantage)
Opening: Queens_Gambit, Queens_Gambit_Other_variations
Moves: 1. d4 d5 2. c4 Bg4 3. Nc3 e6 4. h3 Bh5 5. Nf3 h6 6. e3 Bb4 7. Bd2 Nf6 8. Be2
Bg6 9. Qa4+ Nc6 10. cxd5 exd5 11. Ne5 Qd6 12. Nxg6 fxg6 13. Qb5 O-O 14. Qxb7 *
Position (FEN): r4rk1/pQp3p1/2nq1npp/3p4/1b1P4/2N1P2P/PP1BBPP1/R3K2R b KQ - 0 14
Black to move.
Themes: Defensive Move Middlegame  
Puzzle rating: 2189
Best move: a6