Chess puzzle (Advantage)
Opening: Four_Knights_Game, Four_Knights_Game_Spanish_Variation
Moves: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 d6 5. Bxc6+ bxc6 6. d4 exd4 7. Nxd4 Bb7
8. Bg5 Be7 9. Qf3 c5 10. Nf5 O-O 11. Nxe7+ Qxe7 12. Bxf6 Qxf6 13. Qxf6 gxf6 14.
O-O Kh8 15. Nb5 Bxe4 16. Nxc7 Rg8 17. g3 Rac8 18. Nb5 a6 *
Position (FEN): 2r3rk/5p1p/p2p1p2/1Np5/4b3/6P1/PPP2P1P/R4RK1 w - - 0 19
White to move.
Themes:  Endgame  
Puzzle rating: 671
Best move: Nxd6