Chess puzzle (Advantage)
Opening: Russian_Game, Russian_Game_Stafford_Gambit
Moves: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nc6 4. Nxc6 dxc6 5. d3 Bc5 6. h3 O-O 7. Be2 h6 8.
b3 Bd4 9. c3 Bb6 10. Bb2 Be6 11. Nd2 a5 12. Nc4 Bxc4 13. dxc4 *
Position (FEN): r2q1rk1/1pp2pp1/1bp2n1p/p7/2P1P3/1PP4P/PB2BPP1/R2QK2R b KQ - 0 13
Black to move.
Themes:  Middlegame  
Puzzle rating: 1987
Best move: Nxe4