Chess Board
[ECO code E21] Move Move Here
NIMZO-INDIAN DEF. - Three Kts. Var.
The Korchnoi Variation

Black's QBP to QB4(c5) challenged White's QP.
White moves his challenged Q4(d4) Pawn on to Q5(d5), in turn challenging Black's KP. W-Alt.
	White   Black
 1.	P-Q4    Kt-KB3
 2.	P-QB4   P-K3
 3.	Kt-QB3  B-Kt5
 4.	Kt-B3   P-B4
 5.	P-Q5

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