Chess Board
[ECO code D11] Move Move Here
QGD. TRANSPOSITION
SEMI-SLAV DEF. to QGD. EXCHANGE VAR.

White's QBPawn on QB4(c4) removed Black's QP on Q5(d5) and invited capture.
Black's K3(e6) Pawn removes the newly doubled QP and forms a fixed centre (ie. mutually blocked Ps after an exchange).
	White	Black
 1.	P-Q4	P-Q4
 2.	P-QB4	P-QB3
 3.	Kt-KB3	P-K3!?
 4.	PxP	KPxP

WHITE to Move or Undo or Jump or Clear
 
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