The Duras Gambit Theory :)
A typical mistake in the Duras gambit. On the eighth move you cannot take a pawn (fg). Lose the queen. It was played:
1. e4 f5!? (Duras Gambit) 2. ef Nh6!? 3. Qh5+ Nf7 4. Bc4+ d5 5. Bb3 c6 6. Nf3 Qd6 7. d4 g6! 8. fg??? hg!