This type of seki where each chain has exactly 2 liberties is called 'basic seki' in http://lie.math.brocku.ca/twolf/papers/seki.pdf . It has a linear topology and the encoding 01211 - -
Thomas On Wed, 15 Aug 2012, Nick Wedd wrote:
Yesterday, a KGS game between Blubbel 3d and AyaBot4 2k, SGF file below, ended with an unusual kind of seki. AyaBot4 marked its opponent's stones in the seki as dead, and was eventually booted by an admin for mis-marking stones (as a way of getting the game to end). As all eleven AyaBots use the same IP address, they all got booted - and an hour later, all simultaneously tried to log in again. I mention this, both to explain to Hiroshi what happened to his bots, and because it is an interesting seki, of I type I had never seen before. Nick
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