Life In 19x19

RobertJasiek wrote:

pgwq wrote:3. We should avoid the problem of last dame's profit caused by 1

Why do you perceive it as a problem?

If the above conditions are met, then the Japanese rule is more logical and self consistent.

How to meet above conditions without introducing pass-fights?

If rulesets A and B are logical, then one of them is not more logical than the other. Therefore, even if made logical, Japanese rules cannot be MORE logical than other rules.

Self-consistency of go rules needs context. What shall we perceive as self-consistent? Under which axioms? One possible characteristic of self-consistency is absence of exceptions. To start with the most fundamental exception in Japanese rulesets, they have different rules for moves before and after the game end. Therefore, they can never be self-consistent. Sakai Takeshi, J1989 co-author, has understood this so defends them having flaws as fulfilling Yin and Yang;) Japanese rules may conform to Japanese tradition but such consistent, sic, culture is not self-consistency of the rules themselves.

Harleqin wrote:Do you have a test suite with that list, lightvector?

1. Simple ko: A player cannot gain an extra point by trying to leave the ko mouth open, even if they have many ko threats on the board.
2. Bent 4 in corner: Dead even if there are unremovable ko threats on the board.
3. Regions surrounded by one side only in seki: Do not count as territory.
4. Seki one-sided dame: One-sided dame will not result in gains to the player able to fill them.
5. Two-step ko: Defender does not need to lose an extra point defending if they have enough ko threats. (Life-and-Death Example 10 in https://www.cs.cmu.edu/~wjh/go/rules/Japanese.html)
6. Double ko seki: Should resolve as a seki, through all cleanup phases.
7. Moonshine life: The false eye group will die, regardless of the presence of the double ko seki.
8. Double ko death: Should resolve as a death, without the player having to lose a point for defending an extra time. (*** this is what we're trying to address with the patch ***)
9. Matti's double-ko+chained-ko (viewtopic.php?p=251373#p251373) Should resolve as a seki.
10. Matti's triple-chained-ko-death (viewtopic.php?p=251327#p251327) Should resolve as a death, without the player having to lose a point for defending an extra time. (*** and this ***)
11. Life-and-Death Example 14 in https://www.cs.cmu.edu/~wjh/go/rules/Japanese.html - white must lose the point for an extra play, in agreement with the commentary, and there is no way to avoid this with a pass fight.
12. A lot of "compound" positions resolve the way that Japanese pro intuition wants them to resolve, for example Life-and-Death Example 16,17,18,... in https://www.cs.cmu.edu/~wjh/go/rules/Japanese.html are all in agreement as far as I can tell.
13. I am not aware of any pass fights at all right now. Maybe one exists, but the mechanism I know of that could normally cause it (such as the one I mentioned in a post above) doesn't seem to pose a problem here.