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Subject: Re: Pro Deo [clear hash table always/never]

Author: Uri Blass

Date: 01:41:04 11/16/04

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On November 16, 2004 at 04:01:53, Kurt Utzinger wrote:

>On November 16, 2004 at 03:16:35, Joachim Rang wrote:
>
>>On November 16, 2004 at 01:46:47, Kurt Utzinger wrote:
>>
>>>On November 15, 2004 at 15:42:01, Albert Silver wrote:
>>>
>>>>On November 15, 2004 at 13:37:01, Kurt Utzinger wrote:
>>>>
>>>>>Nunn2 match (60m+10s) 40 games
>>>>>Pro Deo 1.0 vs Fritz 8.0.0.26
>>>>>http://www.utzingerk.com/pro_deo.htm
>>>>>
>>>>>A little test should show the influence of the option [clear hash table =
>>>>>always] and [clear hash table = never]. Below the result against Fritz 8 as Pro
>>>>>Deo had the worst result against this engine:
>>>>>
>>>>>Option [Clear Hash Table = Always]
>>>>>PD = 32.5 %
>>>>>13.0 - 27.0
>>>>>
>>>>>[Clear Hash Table = Never]
>>>>>PD = 36,2 %
>>>>>14.5 - 25.5
>>>>
>>>>I ran some Nunn2 blitz matches as you know, with and without, and the results
>>>>were not clear. Against Aristarch and Ruffian the results were better, and
>>>>against List, PD scored 1 point less.
>>>>
>>>>                                          Albert
>>>
>>>
>>>      Hi Albert
>>>      Is it worth to replay all remaining 280 games
>>>      at time control 60m+10s with clear hash table
>>>      = never http://www.utzingerk.com/pro_deo.htm
>>>      Kurt
>>
>>
>>why should clear Hash Table = Never be an improvement? ProDeo looses important
>>information when it clears the hashtable? Why is this option tested? Did Ed
>>mention that he is not clear whether it helps or not?
>>
>>regards Joachim
>
>
>      Hi Joachim
>      Pro Deo most probably looses informtion when
>      hash tables are cleared after each move I think.


losing information may be productive if there is some bug in remembering the
information.

The only way to know if something is better is by testing.

Uri



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