Arimaa Forum - Print Page


    
      
        Arimaa Forum
        (http://arimaa.com/arimaa/forum/cgi/YaBB.cgi)
      

        Arimaa >> General Discussion >> RU=30
        
(Message started by: Fritzlein on Oct 21^st, 2005, 6:27pm)

Title: RU=30
Post by Fritzlein on Oct 21^st, 2005, 6:27pm

I notice that there are currently twelve bots with an RU of 30. I believe that is a record for the most since the RU's started incrementing. Will there be even more as the computer championship approaches? I hope and expect so.

Title: Re: RU=30
Post by Fritzlein on Dec 2^nd, 2005, 1:05pm

Now (December 2, 2005) there are 13 bots with RU=30. The human vs. bot games have declined recently, but the bot vs. bot games have picked up.

Title: Re: RU=30
Post by Fritzlein on Dec 31^st, 2005, 7:47pm

As we ring in the new year 2006, there are 15 bots with RU=30, thanks in large part to Gnobot practicing against all the available bots in turn.

Title: Re: RU=30
Post by Ryan_Cable on Jan 1^st, 2006, 11:57am

Yesterday, I boosted the number up to 17 at RU=30, but there seems to be a bug in the RU incrementing code.

From http://arimaa.com/arimaa/rating/

Quote:

The rating uncertianty of a player increases by one point per week if the player has been inactive for the week and the rating uncertianty is between 30 and 120.

I think the RU has actually been increased for everyone. As of this post, there are 22 players (including bots) at RU=31 and only 5 at RU=30. I haven’t been paying close attention to RU, but I think this is probably a new year related problem, since no one has mentioned it before.

Title: Re: RU=30
Post by PMertens on Jan 1^st, 2006, 2:54pm

Quote:

I haven’t been paying close attention to RU, but I think this is probably a new year related problem, since no one has mentioned it before.

interesting theory ... but I am pretty sure you will be able to see this again ;)
probably just an undocumented feature nobody really cared about ;D

Title: Re: RU=30
Post by Fritzlein on Jan 1^st, 2006, 8:13pm

Ryan, I'm pretty sure that everyone (human and bot) gets their RU bumped up by one at the end of every week regardless of activity (to a maximum of 120). I think it has been this way since RU's started incrementing. I thought it was supposed to work that way. In fact I believe that's what I originally suggested in another thread, although it is long enough ago that my memory may be faulty.

Title: Re: RU=30
Post by Ryan_Cable on Jan 14^th, 2006, 2:22am

There are currently 18 bots at RU=30, but only 8 humans. However, there are 24 bots with RU<=50, and 21 humans.

Title: Re: RU=30
Post by Ryan_Cable on Jan 15^th, 2006, 4:49am

The server did in fact increment everyone's RU this week.

Title: Re: RU=30
Post by Fritzlein on Mar 13^th, 2006, 8:59pm

on 01/14/06 at 02:22:34, Ryan_Cable wrote:

There are currently 18 bots at RU=30, but only 8 humans.

The number of bots with RU=30 is no longer comparable, given the automatic bot v bot games Omar has running, but the number of humans with RU=30 has jumped from 8 to 14. Yippee!

Title: Re: RU=30
Post by IdahoEv on Mar 15^th, 2006, 3:23am

Noob question: What is RU?

Title: Re: RU=30
Post by 99of9 on Mar 15^th, 2006, 4:12am

It's the "rating uncertainty". It starts very high for newbies, and goes down the more you play (until a limit of 30). But it also increments at one point per week...

Basically it becomes quite a good measure of how often you have played recently.

Title: Re: RU=30
Post by Ryan_Cable on Mar 15^th, 2006, 4:17am

RU stands for rating uncertainty. The difference in rating between 2 players is input into the ELO formula to get the odds of victory/defeat. If you win a game, your rating is increased by your odds of defeat times your RU. Similarly, if you loose a game, your rating is decreased by your odds of victory times your RU.

Noobs begin with a rating uncertainty of 120, and it slowly decreases with each game they play, with a minimum of 30. Also, everyone has their RU incremented by 1 point at the beginning of each week. Thus the number of people with RU=30 at the end of the week is a fairly good measure of the number of highly active humans/bots.

The exact details of the rating system are available at:
http://arimaa.com/arimaa/rating/

PS Currently there are 16 humans with RU=30, and it is not even half way through the week! There are only 4 more humans RU<=40, but with the current noob explosion, I think we will break 20 this month and have a shot at 30 within 2 months.