Chess Board
[ECO code D30]
QGD. TRANSPOSITION
(to) Semi-Slav Variation
White's KKt doubled his QP support and controlled his KKt5(g5) but gave Black options for transposing.
Black (rarely) pushes his QBPawn out to QB3(c6) taking a transpositional Slav line that enables White to avoid the Semi-Slav main line if he wishes. B-Alt.
    White  Black    Transp.White Black
 1. P-Q4   P-Q4		  (1.)
 2. P-QB4  P-K3	    (2.	P-QB4  P-QB3 )
 3. Kt-KB3 P-QB3!?  (3.	Kt-KB3 P-K3!?)
Continue: Transpose or Undo or Jump or Clear