Chess Board
[ECO code D30] Move Move Move Move Move Here Move Here Move Here Move Here
QUEEN'S GAMBIT
(to) Moscow / Vienna Vars. / Catalan QG.
White's KKt doubled his QP support and controlled his KKt5(g5) but gave Black options for transposing.
Black usually also sets his King's Knight, to triple his QP support and double K5(e4) control, reserving his KB and willing to play a Catalan. B-Alt.
    White  Black    Alt. Ind.Def. route
 1. P-Q4   P-Q4	    (1.	P-Q4   Kt-KB3)
 2. P-QB4  P-K3	    (2.	P-QB4  P-K3  )
 3. Kt-KB3 Kt-KB3   (3.	Kt-KB3 P-Q4  )
		  Transp. 3B,2B route
WHITE to Move or Undo or Jump or Clear
 
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