Chess Board
[ECO code D25]
The Janowski-Larsen (aka. Modern) Variation

White's KP step tripled his QP support against 4..P-B4 and freed his KB to attack Black's doubled QBP.
Black develops Queen's Bishop to KKt5(g4) to pin White's KKt. Played in Marshall-Janowski, St. Petersburg 1914 and by Larsen in 1958. B-Alt.
	White	Black
 1.	P-Q4	P-Q4
 2.	P-QB4	PxP
 3.	Kt-KB3	Kt-KB3
 4.	P-K3	B-Kt5

Example ends: Undo or Jump or Clear