Chess Board
[ECO code B20]
SICILIAN DEFENCE - Centre Game
Side Variation
White developed his queen early, to exchange the newly doubled Black QP on Q4(d4).
Black counter-attacks in the centre, developing his Queen's Knight to QB3(c6) attacking White's queen, and will gain a tempo from White's having to relocate it. [Compare position in Centre Game.]
	White	Black
 1.	P-K4    P-QB4
 2.	P-Q4!?	PxP
 3.	QxP?!	Kt-QB3
Example ends: Undo or Jump or Clear