Chess Board
[ECO code D00] Do not scroll the screen..! Move Move Here Move Here
QUEEN'S PAWN GAME
(leading to) Stonewall System
Black advanced his QBPawn to QB4(c5), a sacrificial gambit attack hoping to drag White's QP off-centre.
The QBP threat decides White into strengthening his centre by a limited QBPawn push of his own (despite it hampering his QKt development).
	White	Black
 1.	P-Q4	P-Q4
 2.	P-K3	Kt-KB3
 3.	B-Q3	P-B4
 4.	P-QB3
BLACK to Move or Undo or Jump or Clear
 
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Chess Board

BLACK moves Queen's Knight:

Kt-B3 (Nc6) or QKt-Q2 (Nbd7) ?

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