[Rare] Seki that doesn't look seki

[yebellz]

@gennan

The algorithm needs to recognize seki to score games correctly, which is a much more difficult task than simply flood-filling.

Further, it can be quite tricky to clearly recognize what really counts as a seki position. The rules are worded in a somewhat ambiguous way, and one needs to infer the spirit of the intended interpretation by looking at example positions in the commentary.

Odd Cases in the Japanese Rules

Ambiguous Article Regarding Which Stones are in Seki In an earlier post regarding Compulsory Dame Filling to Prevent Technical Sekis , we discussed the consequences of this article 8 of the rules, which defines seki by the presence of dame: However, note that the sentence “Stones which are alive but possess dame are said to be in seki.” is somewhat ambiguous as to what exactly is meant by “stones” (whether only a solidly connected chain, or possibly some larger strategic group) and “possess d…