Cassandra wrote:
asura wrote:
Have you thought about the comments (and implications) to the long-life in the official commentary?
I slightly recall that I found a deeper problem with this but I never was able to create a position that shows it - maybe I just saw a ghost - and atm I cannot remember my thinking about.
To be honest, I have not thought about it really hard.
However, in my opinion, the comment (referring to "repetition" >>> "no result") is somewhat incomplete.
Hello, asura,
In another context, I had to think about this example again.
Now, I am afraid that the result, which is given in the official commentary, is not correct, at least it is not consistent within the given environment.
The official comment does not mention the single White stone, but White's four-stone group alone.
It is true that White's four-stone group cannot be captured during the long-life cycle, started by Black's Atari on the first line.
However, White's single stone on the right becomes captured every fourth move, so White will be unable to establish a permanent stone on this point. It follows that this stone cannot be called "unconditionally alive".
Black's ten-stone group is not completely surrounded by White stones that are "unconditionally alive", so it may be "dead", but must not be taken off the board at the end of the game. The whole position will become a Seki !!!
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The really most difficult Go problem ever:
https://igohatsuyoron120.de/index.htmIgo Hatsuyōron #120 (really solved by KataGo)