Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nf6/3. Nxe5/3...Nc6/4. Nxf7/4...Kxf7/5. d4

5. d4

This is White's main plan in the Pusab Countergambit.

1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nc6 4.Nxf7 Kxf7 5.d4