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June 1997's Go Answer of the Month


Dia 1 - Does the ladder work?

Dia 1

A simple question this month - do it in your head if you can.
Does the ladder work?

Note that a ladder works if the outside player succeeds in capturing the inside player's stones. In this case, if despite the stones in the bottom right white is captured, then the ladder has worked. White would be happy if the ladder fails.

An extension to this problem - How does the answer change as the ladder in the top left moves up or down.


Dia 2 - Yes it does.

Dia 2


It also works for almost any shift of the ladder. If the ladder is moved up by 1 or 2 points or down by 1, 2 or 3 points it continues to succeed.
I haven't bothered to show the diagrams - it should just be a case of playing them out on a board if you have any doubts.


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