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KGS Go Cafe
PageType: HomePage     Keywords: Online Go, Clubs & Places

The KGS Go Cafe


NOTES:

Blitz King Title Games

  • The Games will be held on Sunday, September 19th at 10AM GMT-4(EST)

- Join the Go Cafe Teaching Ladder

- Looking for suggestions of possible events that can be held at the Go Cafe. If you have any suggestions please post them here or message the director or coodirector.

- We recommend that players should leave our room open so that they may be informed of events more efficiently.


This room can be found under Social Rooms in the KGS Room List.

Our purpose for creating this room is so that players have a place where they can meet other players, talk about Go, teach people, and compete.

Goto [ext] http://senseis.xmp.net/?HowToUseWiki to learn how to use Sensei's Library.


Director: firefox04 (founder)

  • Handles any problems with the club or delegates the task to other staff members who are better suited to solving the problem.

Court Jester: Uvas

  • "Pokes fun at people and generally makes a fool of himself" (quoted from Uvas)

Positions Open

The Cafe is looking for dedicated staff members. If interested please message me at firefox04, Highwind, or Brave.

Co-Directors (Only 2): Brave (aka Highwind)

  • Assists Director. (email at Highwind@netlimit.com)

Events Organizer: AkitoKun?

  • Plans events for the Cafe.
  • Thinks of events for the Cafe.

Events Coordinators: ChibiLi?, Elements14?, AkitoKun?

  • Overlooks/Hosts the events
  • Announce the event in the main rooms 5 minutes beforehand if an announcer is not present

Tournaments Organizer:

  • Organizes future tournaments.

Tournament Coordinators: Ryujii

  • Helps during tournaments with tasks such as recording and verifying wins.
  • Helps Organizer.

Recruiters:

  • Make people AWARE THAT THIS ROOM ACTUALLY EXISTS! (aka invite people into this room)

Mentoring Organizer:

  • Helps pair students and teachers.

SL Page Managers:

  • Checks SL pages for errors in language or format.
  • Removes stuff that doesn't belong on these pages.
  • Check coding for efficiency.

Message Board

Events:

  • Sunday, September 19th, 10AM (GMT-4 Eastern DST) Blitz King Title Games
  • Currently looking for event hosts for:
  • Pro Game Discussion
  • Strong Kyu Game Discussion
  • Go Problems Night

Message firefox04 if interested.

Affiliations:

Quick Suggestions:


Problem of the Month (of September)

[Diagram]
Black to Kill (no ko) (7-41)

IF no solution is offered by the end of the month the answer will be revealed at the end of the month or at the beginning of the next.



Solutions: (enter solutions under here in Black, White, Black,... order):

reptar: My attempt:

 B1 O2, W2 P2, B3 P1, W4 N2, B5 Q2, W6 O1, B7 Q1 - N3 and M1 miai
 B1 O2, W2 N2, B3 Q2, W4 T1, B5 P2 - simple semeai

B1 O2 seems to kill.

Firefox04: Wow, how long did you take to figure out this problem? I didn't expect anyone to figure out this problem this quickly.


Comments on Problem:


KGS Special Problem

wms: I have a problem, but I won't put it as problem of the month because it is not a "typical" go problem.

Lately in rec.games.go a discussion has sprouted up and KGS' implementation of Japanese rules. That jogged my memory about something I thought about a while back, but was never able to prove one way or the other. It occurred to me that it might make a nice problem for people interested in go oddities.

The problem comes from KGS' seki detection code. The goal of the KGS seki detection code is to always correctly spot seki, as long as both a) all dame that can be filled, are filled, and b) all dead stones are marked correctly.

But I thought of one situation that would make the KGS algorithm have an error. I think it is not possible for such a situation to exist, but I'll put it here, and invite people to try to find such a situation, or prove that it cannot exist:

Can you find a position where one player (black, let's say) has two one-eyed seki groups separated by a bamboo joint (or similar connected-by-dame-but-can't-connect shape) of white's. If black tries to push through the bamboo joint, black will die, but if white tries to fill one of the "gap" dame in the bamboo joint, then white will suffer some problem (either dying or allowing one or more black seki groups to become fully alive).

If anybody can find such a board position, then it will be interesting, and I will have to adjust my seki algorithm. If somebody can prove it can't exist, then that's great, my algorithm is fine.

If you want to know more about the algorithm itself, just use google to search rec.games.go for the terms "shubert" and "seki".

rubilia: [ext] Here's the direct link.

wms: OK, te help things along, here is an example position that is close but not quite there:

[Diagram]
Example that is close, but doesn't match, my requirements

This looks like what I need, but note that if black plays first, then black can connect, make life, and kill white by pushing through the bamboo joint; if white moves first, white can just fill the bamboo joint and end up killing both black groups. So this isn't even a seki at all, but it shows what I need - two one-eyed groups, separated by dame. I need a position like this, but where neither player can fill the dame separating the two one-eyed groups. Or, just as good, I need proof that in such a situation, one player will always be able to fill the dame.


impu1se: I think something like the second example under number 4 in StrangeSekis is what you're looking for. wms: No, #4 in strange sekis doesn't match - the two one-eyed groups are opponsing colors, so "connecting" them won't give a living group.


Like this? Neither can attempt to make a move inside the bamboo

[Diagram]
B Like this?


Because if you want them to have eyes it's clearly impossible as filling the dame and connecting would saperate the other 2 killing them... <- That's if I understand you correctly. Because 2 eyes always win vs anything else... And an eye wins vs none providing there aren't enough outside liberties - But if there it wouldn't make sense in the first place...

wms: The example above doesn't work, KGS/CGoban scores it perfectly - there is only a single one-eyed group. Again, look at my example above, the key thing is two one-eyed groups of the same color, connected by dame that neither player can fill. You say that it's clearly impossible, but I don't see that; my point is that filling the dame must be impossible. Don't forget, when you fill dame, you also under certain circumstances reduce your liberties - so there are cases where dame simply cannot be filled safely.


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"Problem of the Month" Archive

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This is a copy of the living page "KGS Go Cafe" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.