Chess Board
[ECO code C65]
RUY LOPEZ - Berlin Def.
Mortimer Defence
White's light QKt5(c5) Bishop under attack moves to QR4(a4), keeping a half-pin on Black's QBP.
Black's Pawn out to Q3(d6) defends his earlier unguarded KP, and frees his QB. Equality.
    White  Black	White  Black
 1. P-K4   P-K4	     5.	Kt-B3  P-B3
 2. Kt-KB3 Kt-QB3    6.	B-R4   P-Q3
 3. B-Kt5  Kt-B3
 4. P-Q3   Kt-K2?!
 5. B-R4   P-Q3
Example ends: Undo or Jump or Clear