> ... A region of 7 inside a benson
> group cannot possibly support enemy life. So moves inside them
> by either color do not improve the position.
Normally (under traditional Go rules) you would be right that a region of 7 surrounded by pass-alive stones cannot be invaded successfully. However, when using positional superko this is *not* true. The reason is moonshine life.
5x5 recapture at a forbidden due to ko
O a O # #
. O # . #
O O # # #
# # # . #
# # # # #
This is also an illustration of why it might make sense to have pass lift the ko ban.
> Right not I'm working on a perfect solver for 5x5
cool :-)
Erik
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