[ECO code A03]
The Lasker Variation
Black counters with Lasker's line, advancing his QBPawn to QB4(c4) prior to playing ..Kt-QB3, ..P-K4 (although 4.P-QKt3..Kt-B3?, 5.B-Kt5! was described by B.Cafferty in 1979 as good for White). B-Alt.
White Black 1. P-KB4 P-Q4 2. P-K3 Kt-KB3 3. Kt-KB3 P-B4
Example ends: Undo or Jump or Clear