Chess Board
[ECO code A09]
RETI OPENING
Centre Counter Variation

Black's early queen exchanged pawns on Q4(d5).
White develops his Queen's Knight to QB3(c3), attacking Black's queen to gain a tempo by causing Black to waste time with either 4..Q-Q1 or (best) 4..Q-QR4, 5.P-Q4..P-B3.
	White	Black
 1.	Kt-KB3	P-Q4
 2.	P-B4	Kt-KB3?!
 3.	PxP	QxP
 4.	Kt-B3

Example ends: Undo or Jump or Clear