Chess Board
[ECO code C66]
RUY LOPEZ - Closed Berlin Defence
The Chigorin Variation
White's QP advance to the centre formed a joint attack on Black's KP and threatened P-Q5.
Black doubles his KP defence by moving his K-side Knight over to Q2(d7), halving the QKt pin. B-Alt.
    White  Black	White  Black
 1. P-K4   P-K4	     5.	P-Q4   Kt-Q2
 2. Kt-KB3 Kt-QB3
 3. B-Kt5  Kt-B3
 4. 0-0    P-Q3
Example ends: Undo or Jump or Clear