English - four knights - Marini variation
1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. a3
White advances the c-pawn to c4. Black pushes the king's pawn to e5. White develops the knight to c3.
Black develops the knight to c6. White moves the knight to f3. Black transfers the knight to f6.
White moves the a-pawn to a3.