King's Gambit Accepted - Abbazia defence (classical defence - modern defence[!])
1. e4 e5 2. f4 exf4 3. Nf3 d5
White moves the king's pawn to e4. Black plays 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 queen's pawn to d5.