Chess Board
[ECO code E42] Move Move Here
NIMZO-INDIAN DEF. - Rubinstein System
The Rubinstein Variation

Black's QBP to QB4(c5) enabled 5..Kt-QB3 behind, challenging White's QP and delaying a ..P-Q4.
White deploys his King's Knight to K2(e2) to defend his QKt and thus avoid doubled QBPs. W-Alt.
	White	Black
 1.	P-Q4	Kt-KB3
 2.	P-QB4	P-K3
 3.	Kt-QB3	B-Kt5
 4.	P-K3	P-B4
 5.	Kt-K2

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