Budapest - Fajarowicz - Steiner variation
1. d4 Nf6 2. c4 e5 3. dxe5 Ne4 4. Qc2
White plays the queen's pawn to d4. Black develops the knight to f6. White pushes the c-pawn to c4.
Black plays the king's pawn to e5. White captures on e5 with the queen's pawn. Black jumps the knight to e4.
White deploys the queen to c2.