QKtP

The obvious moves to this end are: for White the advance of the KBP, for Black that of the QBP and sometimes even of the QKtP, that is when the QBP has not been exchanged for the opposing QP, but has pushed on to B5.

For, as I have already remarked, the objection to developing Black's Queen's Bishop lies in White's threat to attack Black's QKtP with Q-Kt3.

Not that the QP is of paramount importance; the QKtP fully makes up for its loss.

If, for instance, the QKtP were already at his fourth, White would lose.

White's King marches to QKt6 and captures the QB pawns, queening his QKtP.