Chess Board
[ECO code C65]
RUY LOPEZ - Berlin Def.
Mortimer Trap
White's endangered light bishop moved from QKt5(b5) to QB4(c4) to threaten 7.BxP++mate.
Black simply counters by developing his Queen to QR4(a5) with check, and cannot be stopped from gaining a piece by 7..QxKt.
    White  Black	White  Black
 1. P-K4   P-K4	     5.	KtxP?? P-B3
 2. Kt-KB3 Kt-QB3    6.	B-QB4  Q-R4 ch!
 3. B-Kt5  Kt-B3
 4. P-Q3   Kt-K2?!
Example ends: Undo or Jump or Clear