Giuoco Pianissimo - Italian four knights variation
1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 Nf6 5. Nc3
White plays 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 plays the queen's pawn to d3. Black jumps the knight to f6. White moves the knight to c3.