King's Gambit Accepted - bishop's gambit - Bryan counter-gambit
1. e4 e5 2. f4 exf4 3. Bc4 b5
White pushes the king's pawn to e4. Black plays 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 light-squared bishop to c4. Black plays the b-pawn to b5.