Halasz gambit
1. e4 e5 2. d4 exd4 3. f4
White advances the king's pawn to e4. Black pushes the king's pawn to e5. White plays the queen's pawn to d4.
Black captures on d4 with the king's pawn. White advances the f-pawn to f4.
White advances the king's pawn to e4. Black pushes the king's pawn to e5. White plays the queen's pawn to d4.
Black captures on d4 with the king's pawn. White advances the f-pawn to f4.