Chess Board
[ECO code A12]
ENGLISH OPENING - Anglo-Slav Def.
London Variation
White sets his queen's pawn on Q3(d3), starting a contest for K4(e4) in preparation for his own P-K4.
Black's immediate Pawn to K4(e5) is inferior as it expedites White's 9.P-K4 (and if 9..PxKP, 10.PxP..KtxP, 11.Kt-R4 will win a piece for White). B-Alt.
    White  Black     5.	B-KKt2 P-K3
 1. P-QB4  P-QB3     6.	B-Kt2  QKt-Q2
 2. Kt-KB3 P-Q4	     7.	0-0    B-Q3
 3. P-QKt3 Kt-B3     8.	P-Q3   P-K4?!
 4. P-Kt3  B-B4
Example ends: Undo or Jump or Clear