Chess puzzle (Advantage)
Opening: Queens_Gambit_Accepted, Queens_Gambit_Accepted_Old_Variation
Moves: 1. d4 d5 2. c4 dxc4 3. e3 Nc6 4. Bxc4 Bf5 5. Nc3 e6 6. Nf3 a6 7. O-O Bd6 8. e4
Bg4 9. h3 Bh5 10. e5 Bb4 11. a3 Ba5 12. b4 Bb6 13. Be3 Nge7 14. g4 Bg6 15. Rc1
O-O 16. Qb3 Bxd4 17. Nxd4 *
Position (FEN): r2q1rk1/1pp1nppp/p1n1p1b1/4P3/1PBN2P1/PQN1B2P/5P2/2R2RK1 b - - 0 17
Black to move.
Themes:  Middlegame  
Puzzle rating: 1001
Best move: Nxd4