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 1   Arimaa / Events / 2025 WC Rescheduling and Appeal Thread  Jun 27th, 2025, 5:20pm 
Started by SilverMitt | Last post by SilverMitt
We are supporting rescheduling games again this year.  As last year, forfeits may not be considered final until the end of the round window, in case the affected players value playing a game over a tournament win.  (This takes precedence over any conflicting statement on the wiki with respect to the official rules.)
 
This thread is also for any notes and appeals after a timeout, and for the resumption of play after a forfeit.
 
Again the rescheduling rules are:
 
  • Both players should post here
  • Both players should include the timeslot of their future game
  • Other information (such as the game time in EDT or UTC) is helpful, but the game will be scheduled based on timeslot number.  Ensure the number is correct, and beware of daylight savings!
  • Please make every effort to post here at least 24 hours before the ORIGINAL start time.  I will make reasonable efforts to move games on shorter notice, but I can only guarantee a reschedule if I get 24 hours of warning.

 
Please do not use this thread for anything else.
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 2   Arimaa / General Discussion / Re: Question about Arimaa patent  Apr 9th, 2025, 2:07am 
Started by keskyo | Last post by gaieepo
Wanted to ask the same question. Have you reached a conclusion yet? Personally, I see the IP/patent concerns as a relatively minor issue. The real opportunities lie in getting people to join in and play, which could truly benefit and energize the community.
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 3   Arimaa / Site Discussion / Thoughts on posting about Arimaa on Reddit  Jan 30th, 2025, 4:22pm 
Started by rabbits | Last post by rabbits
Similar to how we've been using Discord in addition to this website's chatroom, we could use Reddit in addition to this forum.  Using popular third party platforms has advantages.  Discord and Reddit are polished and featureful.  Reddit posts may be indexed more favorably by search engines and doesn't require maintenance effort[1].
 
However, using such third party platforms does have the downside of pulling usage away from the local chatroom and forum.
 
Here's a new Arimaa subreddit: https://reddit.com/r/arimaa
 
What are your thoughts?
 
[1]: Note that this forum seems to be running on a software release from 2003, and YaBB forums doesn't seem to exist anymore..
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 4   Arimaa / Bot Development / Re: Arimaa AlphaZero Challenge  Dec 20th, 2024, 7:32pm 
Started by omar | Last post by clyring
bot_rusty definitely achieved a sufficient playing strength for this challenge, but if it was made open-source then I haven't heard about it.
 
(I don't know if this prize is still on.)
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 5   Arimaa / Say Hello / Re: Late Introduction  Dec 20th, 2024, 7:32pm 
Started by Animiral | Last post by clyring
Although it had been several years, I did think to myself "Is this the same Animiral as the Arimaa player?" the first time I saw one of your posts on the OGS forums.
 
Welcome back to Arimaa. Have you found the Discord server? As you have probably noticed, this forum is usually not very active, so posts here might not get seen very quickly.
 
If you ever want a game, feel free to ping me in the Arimaa gameroom chat or on OGS.
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 6   Arimaa / Events / Re: Endless Endgame Event?  Sep 19th, 2024, 8:04pm 
Started by clyring | Last post by clyring
2024 round 3 (66) setup and pairings:

 
 


 
clyring (1830) vs browni3141 (2304)
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 7   Arimaa / General Discussion / Arimaa is PSPACE-Hard  Aug 18th, 2024, 2:11pm 
Started by AstroBullivant | Last post by AstroBullivant
Here's an interesting paper: Benjamin G. Rin and Atze Schipper out of the University of Utrecht have proven that Arimaa is PSPACE-Hard:  
 
https://drops.dagstuhl.de/storage/00lipics/lipics-vol291-fun2024/LIPIcs. FUN.2024.27/LIPIcs.FUN.2024.27.pdf
 
At the end of the paper, the authors say that they expect someone eventually to show that arimaa is EXPTIME-Hard.
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 8   Arimaa / Events / Re: 2024 WC Rescheduling and Appeal Thread  Aug 2nd, 2024, 3:17pm 
Started by SilverMitt | Last post by SilverMitt
rabbits-CraggyCornmeal rescheduled to 9 PM ET on Tuesday (virtual slot 146).
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 9   Arimaa / Off Topic Discussion / Re: Sentient AI  Jul 15th, 2024, 1:09am 
Started by omar | Last post by dianapps
Another day of saying why AI is becoming dangerous!
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 10   Arimaa / Events / 2024 WC Rules, Format, and Schedule  May 18th, 2024, 9:15am 
Started by SilverMitt | Last post by SilverMitt
Hi.  The WC event may perhaps be created soon.  Omar seems to be happy to go with something a lot like last year, which was triple elimination, although it might be good to discuss the time control, where the 6-minute maximum move time was turned on, but still with the high reserve to start.
 
Also it might be good to figure out exactly which pairing algorithm to use, as I believe I was not aware of subtle differences last year for the triple elims.
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