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        Arimaa >> General Discussion >> Bots tied in the ladder
        
(Message started by: NIC1138 on Apr 26^th, 2006, 11:43am)

Title: Bots tied in the ladder
Post by NIC1138 on Apr 26^th, 2006, 11:43am

How come the first bots in the ladder are all around the 1250 level?... How different is their algorithms??...

Title: Re: Bots tied in the ladder
Post by Fritzlein on Apr 26^th, 2006, 1:04pm

I'm pretty sure their algorithms are quite different from each other. Even Loc2005 and Loc2006 are somewhat different, although perhaps being cut off at P1 makes them play nearly identically.

The current bunching of ratings is probably just a freak chance, given how variable the bot ratings are. I notice that one week ago ArimaaScoreP1 was rated 1271, and now it is rated 1042. ShallowBlue is moving the other way, from a rating of 1180 last week to a rating of 1240 now. Probably a week from now the strange knot of bots at 1250 will have spread out again just from random variation, especially if a few new players start playing through.

Title: Re: Bots tied in the ladder
Post by NIC1138 on Apr 26^th, 2006, 3:09pm

Yeah, it´s true, I was surprised to see Shallow Blue rise from the gutter recently!... But right now, there is a sensitive gap between Clueless and Bomb, and the others... About 400 points, what about this? It´s a large step in the ladder! :)

This automatic rating update is a strange thing. I would like to see an alternative rating calculation with a slower update speed... Can I have access to the whole game result database?? It´s an interesting statistics/signal processing problem, to design the filters... I could use this when I become a teacher in the distant future! :)

Title: Re: Bots tied in the ladder
Post by Fritzlein on Apr 26^th, 2006, 8:24pm

on 04/26/06 at 15:09:52, NIC1138 wrote:

Can I have access to the whole game result database??

Yes, the game result database is at http://arimaa.com/arimaa/download/gameData/

You are welcome and encouraged to create a better rating system. There has been some discussion of the rating system in various past threads in the Forum, including

Anchoring the rating system with bots
http://arimaa.com/arimaa/forum/cgi/YaBB.cgi?board=talk;action=display;num=1065901453

Accounting for newcomers differently
http://arimaa.com/arimaa/forum/cgi/YaBB.cgi?board=talk;action=display;num=1140458845

Accounting for different time controls in a single account
http://arimaa.com/arimaa/forum/cgi/YaBB.cgi?board=talk;action=display;num=1103741634

Dealing with rating intransitivity
http://arimaa.com/arimaa/forum/cgi/YaBB.cgi?board=talk;action=display;num=1096120807

http://arimaa.com/arimaa/forum/cgi/YaBB.cgi?board=talk;action=display;num=1140647814

Also ratings-related issues pop up in many threads on other topics. Reading back through all the old posts in the Forum is an interesting historical exercise, if you've got the time. :-)