Life In 19x19

Announcing Josekle, a daily joseki guessing game

https://okonomichiyaki.github.io/josekle/img/cropped.png


Play it here: https://okonomichiyaki.github.io/josekle/


More discussion on OGS forums: https://forums.online-go.com/t/josekle/41262

Development discussion: https://forums.online-go ...

Figured out how to customize OGS such that the stones are placed centered on the squares. Might make it easier for some people to count.

More details on how here:
https://forums.online-go.com/t/visualiz ... ?u=yebellz

Hi RobertJasiek,

Thank you for the replies.

Yes, I meant to ask specifically about how this corner would work out under the Japanese 1989 rules, regardless of this being a game on OGS.

I believe you are saying that Japanese 1989 rules would treat T1, R3, and S5 all as not territory. Please ...

A seki occurred in the bottom-right corner of this game on OGS:

https://online-go.com/game/25731373

I believe T1 and R3 are not counted as territory under Japanese rules (since the surrounding stones are in seki for sharing a dame point at Q1), however, I'm not sure about S5.

Do the black stones ...

Just wanted to share this meme with you all

Well, a komi of 7 would mean you get 70% equity (40% win + 60% draw), so that's not fair. A komi of 8 would mean you get 40% equity (40% win + 60% loss). So that's not fair either. The most fair blend would be if komi were 7 a third of the time, and komi were 8 two-thirds of the time, giving you ...

There is an interesting discussion on the OGS forums about various alternative coordinate systems, motivated by the scenario of recording moves on pen and paper (where a kifu sheet is not available).

OGS Forums Thread: Tournament Shorthand

With a non-integer komi, in principle, one side should be able to force a win (provided that we are talking about a ruleset that avoids "no results").

I think the observations from AI win rates suggests that the correct komi under area scoring should be 7. If that's the case, then with stronger AI ...

Thanks for the response and clarifications!

So, I guess what you are saying is that a position can be both anti-seki and cause both players to lose, if it also creates an effective move that will affect the outcome.

I was under the mistaken impression that anti-seki vs both players lose were ...

Yes, just kidding, hence the winking emoji.

However, it would be interesting to see the Ing ko rules formalized for bot play ...

I never managed to understand those rules. Is there a clear article explaining them somewhere online?

In the J89 rules, there's a curious position mentioned in the commentary:

$$B Anti-Seki
$$ -------------
$$ | X O M X O .
$$ | . X X X O .
$$ | X X O O O .
$$ | O O O , . .
$$ | . . . . . .
which is explained as:
If the game ends like this, Black and White are both dead but none of the stones ...

Under Japanese rules, its still possible for a bent four in the corner to not die. See the example on this page:
http://warp.povusers.org/go/UndeadBentFours/
Basically, two bent-4's that share a liberty can form an overall seki position, in a manner analogous to hanezeki, where initiating puts ...

Any plans to support Ing ko rules?

I don't know anything about AI-assisted tournaments in the go world. However, this concept has been around for quite a while in the chess world, where it is known as "Advanced Chess" (or "centaur chess" or "cyborg chess"):

m

When this is done with chess, typically each human player can just ...

A while back, the admins of GoGameGuru posted their SGF collections (commented game records and go problems) on GitHub:

https://github.com/gogameguru/commented-go-games
https://github.com/gogameguru/go-problems

They were released under a Creative Commons license (CC BY-SA-NC 4.0).