Chess Board
[ECO code B17]
The Steinitz Variation

White's QKt completed a pawn exchange on K4(e4).
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