Chess Board
[ECO code D00] Move Move Here
(leading to) Stonewall System

White developed his KB to Q3(d3) to deter 3...Kt-K5 and assist his own eventual P-K4 advance.
Black advances a gambit Queen's Bishop's Pawn to QB4(c5), a sacrificial attack against White's QP in the hope of dragging it off-centre (akin to a "Queen's Gambit Reversed" tactic). B-Alt.
	White	Black
 1.	P-Q4	P-Q4
 2.	P-K3	Kt-KB3
 3.	B-Q3	P-B4

WHITE to Move or Undo or Jump or Clear
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