Chess Board
[ECO code D38] Move Move Move Here Move Here
TRANSPOSITION
QGD (Ragozin Var.) to NIMZO-INDIAN (Rubinstein Sys.)

White's KP push supported his QP and freed the diagonal for his KB to defend his earlier gambit QBP.
Black castles short, activating his King's Rook. Seen equally seen via the Nimzo-Indian Rubinstein.
    White  Black    Main Nimzo-I. route
 1. P-Q4   P-Q4	    (1.	P-Q4   Kt-KB3)
 2. P-QB4  P-K3	    	  (2.)
 3. Kt-QB3 Kt-KB3   (3.	Kt-QB3 B-Kt5 )
 4. Kt-B3  B-Kt5    (4.	P-K3   0-0   )
 5. P-K3   0-0	    (5.	Kt-B3  P-Q4  )

WHITE to Move or Undo or Jump or Clear
 
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