Petrov - Kaufmann attack
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. c4
White advances 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 f6. White captures with the knight on e5. Black moves the queen's pawn to d6.
White transfers the knight to f3. Black captures with the knight on e4. White pushes the c-pawn to c4.