Chess Board
[ECO code B32]
SICILIAN DEFENCE - Orthodox Var.
The Nimzowitsch (aka. Carlsbad) Variation
White's Kt completed a pawn exchange on Q4(d4).
Black advances his Queen's Pawn to the centre, attacking White's KP. A dubious line only played once by Nimzowitsch at Carlsbad, 1923. Usually continues 5.B-QKt5..PxP, 6.KtxKt..QxQ+ch. B-Alt.
	White	Black
 1.	P-K4	P-QB4
 2.	Kt-KB3	Kt-QB3
 3.	P-Q4	PxP
 4.	KtxP	P-Q4
Example ends: Undo or Jump or Clear