RobertJasiek wrote:
Do I understand it correctly that the problem is still far from being solved?
What do you understand by "solved"?
Karl's training of his 40b network and my training of the (initially) 60b network (later 28b) followed completely different philosophies.
Nevertheless, all came to an identical result: the
Main Semeai is favoured, the best result for both sides is
"White + 2" (with Komi = 1).
In contrast to Karl, I was unable to find access to the “hintpos” support of the training, with which KataGo is able to detect its own incorrect evaluations.
As a “substitute” I used the 60b/40b games (later 28b/40b), in which 40b could find the mistakes of 60b (28b).
As an actually unintended side effect, non-Main-Semeai variations occasionally appeared in these games (usually initiated by 60b/28b), which (if played correctly) also end with "White + 2" (with Komi = 1).
Are all basic non-Main-Semeai lines already known? No idea (probably not).
In addition, many of the known ones (especially those that start early) have yet to undergo a (very lengthy) evaluation.
RobertJasiek wrote:
What score does current research suggest and what was the originally believed score?
See above: "White + 2" (with Komi = 1).
The "originally believed score" is hidden in the mists of history.
Problem 120 is one of only two problems of Igo Hatsuyôron for which Inoue Dôsetsu Inseki did NOT give a result. It simply says “黒先” = “Black first”.
We can only conclude from the (now known) title "孔明仲達勢" = "Zhuge Liang and Sima Yi" of the problem by consulting the history of ancient China that White is expected to maintain the upper hand.
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The really most difficult Go problem ever:
https://igohatsuyoron120.de/index.htmIgo Hatsuyōron #120 (really solved by KataGo)