Chess puzzle (Advantage)
Opening: Russian_Game, Russian_Game_Stafford_Gambit
Moves: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nc6 4. Nxc6 dxc6 5. Qe2 Bc5 6. e5 *
Position (FEN): r1bqk2r/ppp2ppp/2p2n2/2b1P3/8/8/PPPPQPPP/RNB1KB1R b KQkq - 0 6
Black to move.
Themes:  Opening  
Puzzle rating: 2002
Best move: Ng4