Chess Board
[ECO code E12]
QUEEN'S INDIAN DEFENCE
Petrosian System
White's QKtPawn completed an exchange of knights on QB3(c3) and created a half-open QKt file.
Black's QB3(c6) Pawn to QB4(c5) frees his light bishop to pressure the centre, with equality.
    White  Black	White  Black
 1. P-Q4   Kt-KB3    6.	BPxP   KtxP
 2. P-QB4  P-K3	     7.	P-K3   B-K2
 3. Kt-KB3 P-QKt3    8.	B-Kt5 ch P-B3
 4. P-QR3  B-Kt2     9.	B-Q3   KtxKt
 5. Kt-B3  P-Q4	    10.	PxKt   P-QB4
Example ends: Undo or Jump or Clear