Chess Board
[ECO code A31]
TRANSPOSITION
ENGLISH OPG. to BENONI SYSTEM (Blumenfeld V.)
White's QP advanced with KKt+Q support to control Black's K4(e5), and challenged Black's QBP.
Black often switches to the Blumenfeld line of the Benoni System by a King's Pawn to K3(e6), freeing his KB to defend his QP and so increase pressure on White (though best is 3..PxP, 4.KtxP,P-K3). B-Alt.
    White  Black    Transp.White Black
 1. P-QB4  P-QB4    (1.	P-Q4   Kt-KB3)
 2. Kt-KB3 Kt-KB3   (2.	P-QB4  P-K3  )
 3. P-Q4   P-K3	    (3.	Kt-KB3 P-B4  )
Continue: Transpose or Undo or Jump or Clear