[ECO code B17]
The Steinitz Variation
Black here develops his Queen's Knight to Q2(d7) rather than 4..Kt-KB3 or (usually) 4..B-B4. The immediate danger is that he may smother his own king (eg. 5.Q-K2!?.., 6.Kt-Q6++mate). B-Alt.
White Black 1. P-K4 P-QB3 2. P-Q4 P-Q4 3. Kt-QB3 PxP 4. KtxP Kt-Q2
Example ends: Undo or Jump or Clear