King's Gambit Accepted - Allgaier gambit
1. e4 e5 2. f4 exf4 3. Nf3 g5 4. h4 g4 5. Ng5
White pushes the king's pawn to e4. Black pushes the king's pawn to e5. White moves the f-pawn to f4.
Black captures on f4 with the king's pawn. White develops the knight to f3. Black moves the g-pawn to g5.
White pushes the h-pawn to h4. Black advances the g-pawn to g4. White transfers the knight to g5.