Chess puzzle (Advantage)
Opening: Russian_Game, Russian_Game_Nimzowitsch_Attack
Moves: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Nc3 Nxc3 6. dxc3 Be7 7. Bd3 O-O
8. O-O Nd7 9. Nd4 Ne5 10. Nf5 Bf6 11. Be4 d5 12. Bd3 c5 13. f4 *
Position (FEN): r1bq1rk1/pp3ppp/5b2/2ppnN2/5P2/2PB4/PPP3PP/R1BQ1RK1 b - - 0 13
Black to move.
Themes:  Opening  
Puzzle rating: 1188
Best move: Nxd3