Giuoco Pianissimo - Dubois variation
1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 f5 5. Ng5 f4
White advances the king's pawn to e4. Black advances 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 queen's pawn to d3. Black pushes the f-pawn to f5. White moves the knight to g5.
Black moves the f-pawn to f4.