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Subject: Re: Depth vs Time

Author: Steve Coladonato

Date: 04:26:10 06/26/02

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On June 25, 2002 at 11:43:05, Gian-Carlo Pascutto wrote:

>On June 25, 2002 at 11:28:03, Steve Coladonato wrote:
>
>>You keep saying this but a ply is a ply and if program X reports a score at ply
>>depth M and program Y reports a score at ply depth M then there is a comparison
>>to be made here.
>
>Yes, you can make 'a' comparison. The issue is whether that comparison
>makes any sense.
>
>What point are you going to try to illustrate by comparing 14 plies
>from Gandalf with 14 plies of Fritz?
>
>--
>GCP

I'm going to compare the time it takes for each program to get to 14 ply.  For
example, say I have a game I want to analyze over night.  Let's say the game has
40 moves and I don't want to analyze the first 5.  That leaves 35 moves to
analyze or a position analysis by the engine 70 times (analysis for both black
and white).  And say I also want to have the analysis go to 11 ply.  If Fritz
takes 6 mins. to get to 11 ply that equates to 70*6/60 or 7 hours of compute
time.  If Gandalf takes 2 hrs. to get to 11 ply that's 70*2/24 or almost 6 days
to do the analysis.  So if I constrain the time for analyzing each move to
around 6 mins., Fritz will have it done for me the following morning.  This
example is only a generalization and I know that programs utilize the allotted 6
mins. differently but the idea is to find the deepest depth I'm comfortable with
and have an engine analyze the game inside some time constraint.

Steve



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