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. Be3 Nc6
8. Qd2 Bf5 9. O-O-O Bf6 10. h3 O-O 11. g4 Bg6 12. g5 Be5 13. Nd4 Nxd4 *
Position (FEN): r2q1rk1/ppp2ppp/3p2b1/4b1P1/3n4/2P1B2P/PPPQ1P2/2KR1B1R w - - 0 14
White to move.
Themes:  Opening  
Puzzle rating: 1590
Best move: cxd4