Chess Board
[ECO code B18 > 19] Move Move Here
The Classical Variation

White's QKt completed a pawn exchange on K4(e4).
Black usually develops his Queen's Bishop to KB4(f5) to attack and dislodge White's undefended knight (thus gaining time) in preference to 4..Kt-KB3 or 4..Kt-Q2. B-Alt.
	White	Black
 1.	P-K4	P-QB3
 2.	P-Q4	P-Q4
 3.	Kt-QB3	PxP
 4.	KtxP	B-B4

WHITE to Move or Undo or Jump or Clear
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