Chess Board
[ECO code C71]
RUY LOPEZ - Steinitz Defence Deferred
Duras System
Black develops his Queen's Bishop to KKt5(g4) to pin White's KKt. B-Alt.
White develops his Queen's Knight to QB3(c3) after posting his QBP, and supports his KP.
    White  Black	White  Black
 1. P-K4   P-K4	     6.	Kt-B3
 2. Kt-KB3 Kt-QB3
 3. B-Kt5  P-QR3
 4. B-R4   P-Q3
 5. P-B4   B-KKt5
Example ends: Undo or Jump or Clear