King's Gambit Accepted - Muzio gambit - Brentano defence
1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O d5
White plays the king's pawn to e4. Black plays the king's pawn to e5. White advances 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 develops the light-squared bishop to c4. Black pushes the g-pawn to g4. White castles kingside.
Black advances the queen's pawn to d5.