CDavis7M wrote:
The single black and white ko-stones are dead stones. This is why points "a" and "b" are dame (they are not surrounded by living stones of one player). The fact that a and b are dame was already discussed in the comments to Article 8. Points a and b being dame is why the 6 black stones (including the single black stone) are living seki stones. Yes, the single black ko-stone (黒一子) is deemed a dead stone when its life and death is assessed, but the 6 black stones (黒六子) including the one ko-stone are deemed alive when their life and death is assessed. 黒六子 have dame and so are seki stones. This is clear to me when reading it in Japanese. There is no discrepancy here. I don't know what rules you are reading.
You should not believe everything that is written in J89.This reference to the shape of a "double-ko seki" was one of the very clear mistakes in J89's Commentary (original version).
Even the current version is NOT correct (not saying anything about "dead" or "alive" stones any longer, but), declaring ALL stones in the corner being "seki stones", because they have a "dame".
In addition, this error was also ADDED to the commentary to L&D Example 25, which was CORRECT in the ORIGINAL version (according to James Davies' translation).
The corresposing legal text of Article 8 does NOT leave any room for misunderstanding:
ONLY "alive" stones can become "seki STONES".
But both sides single stones are "dead"!!!
It simply did not make any sense to insert popular science explanation into a rules text. At least not at this crucial spot!
It should be evident that IT DOES MATTER whether stones are part of a "seki" (which is NOT defined in J89), or are "seki stones", as defined within J89.
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The really most difficult Go problem ever:
https://igohatsuyoron120.de/index.htmIgo Hatsuyōron #120 (really solved by KataGo)