Chess Board
[ECO code C42] Move Move Here
PETROFF'S DEFENCE
Marshall Attack (alt. route)
White's QBPawn advance to QB4(c4) attacks Black's QP to unhinge his centre Kt by 8..PxP, 9.BxKt.
Black, untempted, offers a sacrifice by developing Queen's Bishop to KKt5(g4) to pin White's KKt.
    White  Black	White  Black
 1. P-K4   P-K4	     6.	B-Q3   B-Q3
 2. Kt-KB3 Kt-KB3    7.	0-0    0-0
 3. KtxP   P-Q3	     8.	P-B4   B-KKt5
 4. Kt-KB3 KtxP
 5. P-Q4   P-Q4	   Main 8B,7B route
WHITE to Move or Undo or Jump or Clear
 
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