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Subject: Re: Ply Depth in relation to Elo again...

Author: Dann Corbit

Date: 18:18:49 05/23/00

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On May 23, 2000 at 16:11:13, Albert Silver wrote:
>On May 23, 2000 at 12:20:55, Rafael Andrist wrote:
>>On May 23, 2000 at 09:05:15, Robert Hyatt wrote:
>>>
>>>First, I don't think "90" is a "magic number".  Bruce found that Ferret
>>>searching very shallowly could hold a rating > 2200 on ICC.  At the time,
>>>his program was rated over 2800 in a real rating there.  Which means each
>>>ply was worth much less than 90.    So "N" points per ply, linearly?  I think
>>>it is definitely possible.  And yes, it is possible that some programs begin
>>>to 'flatten out' while others don't.  I don't see anything that suggests that
>>>can't happen either.
>>
>>I think also that it's possible that the ELO is linear to the ply. But is the
>>ELO linear to the playing strenght? I mean that it would be very hard for a 1400
>>ELO player to beat a 1500 ELO player but not for one with 2500 ELO to beat one
>>with 2600 ELO.
>
>Why is it more difficult for a 1400 player to beat a 1500 player (presuming no
>anomalies such as different lists, countries, etc...) than a 2500 to beat a
>2600?

Based upon broad averages (thousands of players and contests) there is no
difference at all.  The win expectancy is an identical 36% of the points scored
for an ELO difference of 100 points.



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