Evans gambit - Leonhardt variation
1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 b5
White moves the king's pawn to e4. Black moves the king's pawn to e5. White develops the knight to f3.
Black develops the knight to c6. White develops the light-squared bishop to c4. Black develops the dark-squared bishop to c5.
White advances the b-pawn to b4. Black captures with the dark-squared bishop on b4. White moves the c-pawn to c3.
Black places the dark-squared bishop to a5. White advances the queen's pawn to d4. Black moves the b-pawn to b5.