King's Gambit Accepted - Bonsch-Osmolovsky variation
1. e4 e5 2. f4 exf4 3. Nf3 Ne7
White pushes the king's pawn to e4. Black pushes the king's pawn to e5. White plays the f-pawn to f4.
Black captures on f4 with the king's pawn. White develops the knight to f3. Black develops the knight to e7.