Ponziani - Jaenisch counter-attack
1. e4 e5 2. Nf3 Nc6 3. c3 Nf6
White plays the king's pawn to e4. Black pushes the king's pawn to e5. White develops the knight to f3.
Black develops the knight to c6. White plays the c-pawn to c3. Black jumps the knight to f6.