Forum for Carpenter's Square

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Two outside liberties discussion [#1912]

Unkx80: Two outside liberties discussion (2009-07-28 18:45) [#6254]

Two outside liberties

If the black group has two outside liberties, White's best way towards the ko is to hane before playing on the vital 2-2 point.

This is not quite correct (see below) :-) Use GoTools for this kind of analysis

Black can also turn at 2, in which case White needs to continue at the 3-2 point.

The basic attack only produces a three move approach ko that is harder for White to win.

In fact, after 2, Black dies without ko, like this :

SiouxDenim: More material for discussion (2011-07-31 03:09) [#8652]

In All About Life and Death it says that this approach is correct for zero or one outside liberties.

The same approach will also create a ko when there are two outside liberties. What are the advantages (apart from maximising the chances of a mistake) to the other patterns discussed?

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