Chess Board
[ECO code E12] Move Move Here
Petrosian System

White pushed his QRPawn out to QR3(a3) to avoid a QKt pin and prevent 4..B-QKt5+ch - a line popularised by Gary Kasparov in the 1980s.
Black develops his "Indian" Queen's Bishop into place on QKt2(b7), and dominates the "light" centre.
	White	Black
 1.	P-Q4	Kt-KB3
 2.	P-QB4	P-K3
 3.	Kt-KB3	P-QKt3
 4.	P-QR3	B-Kt2

WHITE to Move or Undo or Jump or Clear
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