Elostat

Discussion of computer chess matches and engine tournaments.

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George Bodkin
Posts: 160
Joined: Wed Mar 08, 2006 7:46 pm
Location: Selden, NY

Elostat

Post by George Bodkin » Sun May 20, 2007 4:17 pm

What start rating should be used when running Elostat 2400 or 2650.

Thanks George

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George Tsavdaris
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Joined: Thu Mar 09, 2006 11:35 am

Re: Elostat

Post by George Tsavdaris » Sun May 20, 2007 4:26 pm

George Bodkin wrote:What start rating should be used when running Elostat 2400 or 2650.

Thanks George
It doesn't matter at all! You can put 0 or 100 or anything as starting ELO.

What matters is the rating difference between 2 opponents and not the rating ratio.
That means:
Player A -> 2780 ELO
Player B -> 2640 ELO

is equivalent to:

Player A -> 780 ELO
Player B -> 640 ELO

as also equivalent to:

Player A -> 180 ELO
Player B -> 40 ELO

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Kirill Kryukov
Posts: 492
Joined: Sun Mar 19, 2006 3:12 am

Re: Elostat

Post by Kirill Kryukov » Mon May 21, 2007 6:47 am

George Bodkin wrote:What start rating should be used when running Elostat 2400 or 2650.

Thanks George
Although it does not particularly matter what start rating you use with ELOstat, you may still prefer to produce some "conventional" ratings, which means relatively strong engines will have ratings of about 2700+. Several common ways to do it:

1. Take random number, like 2400, as starting ELO. Compute ratings, check if the ratings are familiar, adjust and re-compute if necessary.

2. Take any random engine and fix its ELO to be constant. For example CEGT has been fixing Shredder 9 rating to be always 2750 (I am not sure if they are still doing it).

3. Take selection of several engines and fix their everage ELO to be constant. (Or you can use weighted average if you don't have enough engines with large number of games). This is how we compute CCRL rating lists.

Best,
Kirill

Norm Pollock
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Joined: Thu Mar 09, 2006 3:15 pm
Location: Long Island, NY, USA
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Re: Elostat

Post by Norm Pollock » Mon May 21, 2007 12:10 pm

Also adjust the engine names. For example: "Shredder 10.0 64-bit" and "Shredder 10.0 x64" are considered by elostat to be 2 completely different engines.

On a side note, let me mention that as a user of both CCRL and CEGT, I have noticed that the 2 services often use different names for the same engine/version. If they would use unified names, it would easier for me to use elostat on a merged database.

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