Chess Board
[ECO code C71]
RUY LOPEZ - Steinitz Def. Deferred
"Attack" Variation
White develops his Queen's Knight to QB3(c3) removing Black's doubled QBP.
Black's QBPawn to QB3(c6) doubles his QKtP support, with equality (less developed but a P up).
    White  Black     6.	0-0    P-QKt4
 1. P-K4   P-K4	     7.	B-B3   KtxP
 2. Kt-KB3 Kt-QB3    8.	KtxKt  PxKt
 3. B-Kt5  P-QR3     9.	P-QB3  PxP
 4. B-R4   P-Q3	    10.	Q-R5   Q-B3
 5. P-Q4   B-Q2	    11. KtxP   P-B3!
Example ends: Undo or Jump or Clear