Chess Board
[ECO code B00] Move Move Here
NIMZOWITSCH DEFENCE
"Centre Counter" Variation

White's Queen's Knight develops to attack the queen on Q5(d5), which must move again (losing a tempo so that Black lags in development) or be lost.
Black's Queen moves to QR4(a5) to half-pin the White Kt+QP+K - more positive than just retreating.
	White	Black
 1.	P-K4	Kt-QB3
 2.	Kt-KB3	P-Q4
 3.	PxP	QxP
 4.	Kt-B3	Q-QR4

WHITE to Move or Undo or Jump or Clear
 
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