Chess puzzle (Advantage)
Opening: Four_Knights_Game, Four_Knights_Game_Italian_Variation
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Nc3 Be7 5. O-O O-O 6. d3 d6 7. h3 Nd4 8. Nxd4
exd4 9. Nb5 c5 10. Bg5 a6 11. Na3 b5 12. Bd5 *
Position (FEN): r1bq1rk1/4bppp/p2p1n2/1ppB2B1/3pP3/N2P3P/PPP2PP1/R2Q1RK1 b - - 1 12
Black to move.
Themes:  Middlegame  
Puzzle rating: 949
Best move: Nxd5