Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Vienna_Variation
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 dxc4 5. e4 a6 6. Bxc4 b5 7. Bd3 Nc6 8. Bg5
Be7 9. e5 Nd5 10. Bxe7 Ndxe7 11. O-O Nxd4 *
Position (FEN): r1bqk2r/2p1nppp/p3p3/1p2P3/3n4/2NB1N2/PP3PPP/R2Q1RK1 w kq - 0 12
White to move.
Themes:  Opening  
Puzzle rating: 1221
Best move: Nxd4