Chess Board
[ECO code A09]
TRANSPOSITION
RETI OPG. (Centre Counter) to QGD. (Marshall Def.)
Black set his KKt to defend his centre QP - a weak or dubious reply to White's QBP gambit challenge.
White transposes into a Queen's Gambit Irregular Defence with an equally weak move [best is 3.PxP], advancing a gambit Queen's Pawn to further his control of Black's K4(e5). W-Alt.
    White  Black    Transp.White Black
 1. Kt-KB3 P-Q4	    (1.	P-Q4   P-Q4  )
 2. P-B4   Kt-KB3?! (2.	P-QB4  Kt-KB3)
 3. P-Q4	    (3.	Kt-KB3	     )
Continue: Transpose or Undo or Jump or Clear