King's Gambit Accepted - Gianutio counter-gambit
1. e4 e5 2. f4 exf4 3. Nf3 f5
White moves the king's pawn to e4. Black advances 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 f-pawn to f5.