Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Vienna_Variation
Moves: 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Nf3 dxc4 5. e3 Be7 6. Bxc4 O-O 7. O-O a6 8. Qc2
c5 9. Rd1 cxd4 10. exd4 b5 11. Bd3 Bb7 12. Ne5 Nc6 13. Ne4 *
Position (FEN): r2q1rk1/1b2bppp/p1n1pn2/1p2N3/3PN3/3B4/PPQ2PPP/R1BR2K1 b - - 5 13
Black to move.
Themes:  Opening  
Puzzle rating: 1966
Best move: Nxd4