White develops his QKt to QB3(c3)
to support his KPawn and to prevent a Black QPawn advance
(by assuming control of Black's Q4(d5) square). Black moves his QKt further with his
own KP protection, ready for any early opportunity to mate.
White Black
1. P-K4 P-K4
2. Kt-K2 Kt-QB3
3. Kt-QB3 Kt-Q5