Chess Board
[ECO code C65]
RUY LOPEZ - Berlin Defence
Fishing Pole Var. - Trap Variation
White's KR3(h3) pawn took the under-defended knight on KKt4(g4) - a bad decision.
Black's KR4(h5) Pawn takes the KKt5(g4) pawn, attacking the KKt and closing the trap for (eg.) 7.Kt-R2 (or Kt-K1)..Q-R5, 8.P-KB4..P-Kt6, 9..Q-R7++mate.
    White  Black	White  Black
 1. P-K4   P-K4	     5.	P-KR3  P-KR4
 2. Kt-KB3 Kt-QB3    6.	PxKt?? PxP
 3. B-Kt5  Kt-B3
 4. 0-0	   Kt-Kt5?!
Example ends: Undo or Jump or Clear