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 1   Arimaa / General Discussion / Question about Arimaa patent  Feb 1st, 2025, 3:38pm 
Started by keskyo | Last post by keskyo
Hello everyone!  
 
I am a developer and recently I was developing an Arimaa game engine as a hobby project. I plan to add a little server program to allow playing online. I searched and aparently the patent expired in 2023, but this site says I need an authorization to make public my project. Was the actual state of the patent? Can I open-source  (publish the source code) when it's finished without any authorization? Thank you for any guidance in advance.
 
PD: I'm not trying to compete with this site. My project is just for learning and researching propouses.
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 2   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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 3   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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 4   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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 5   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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 6   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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 7   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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 8   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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 9   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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 10   Arimaa / Bot Development / Re: (no) absolute score values for pieces?  Nov 18th, 2023, 9:13am 
Started by clauchau | Last post by aaaa
As a very belated historical note, the chosen values for the constants of HarLog, Q and G, are effectively fully determined by:
  • (as mentioned) being indifferent to an initial trade of a dog for 2 rabbits and
  • having the advantage of an initial trade of a horse and cat for a camel be exactly flipped after all the dogs come off the board.
This works out to finding the positive value Q that satisfies:
G = (Q^2 + 13*Q + 38)/((Q^3 + 15*Q^2 + 74*Q + 120)*ln(10/7)) = -2*(Q^3 + 5*Q^2 - 2*Q - 22)/((Q^4 + 11*Q^3 + 41*Q^2 + 61*Q + 30)*ln(65/56))
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