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Subject: Re: Alpha/Beta adjustments via the hashtable or why Fritz 7 has messy PV's

Author: Ulrich Tuerke

Date: 03:27:41 12/04/01

Go up one level in this thread


On December 04, 2001 at 03:55:21, Tony Werten wrote:

>On December 03, 2001 at 11:01:56, Ulrich Tuerke wrote:
>
>>On December 03, 2001 at 09:26:21, Gian-Carlo Pascutto wrote:
>>
>>>On December 03, 2001 at 09:19:16, Ulrich Tuerke wrote:
>>>
>>>>I don't agree fully with you, Gian-Carlo.
>>>>
>>>>I think that getting unreliable main variations is a well known consequence of
>>>>any zero window search like for instance PVS or MTD.
>>>>The reason is that you will very often have moves in the PV which are just
>>>>sufficient to refute the preceeding move. In general you wan't have exact scores
>>>>neither exact variations.
>>>>
>>>>I don't think that this effect has to be attributed to the hashing algorithm.
>>>
>>>In PVS, the mainvariation should _not_ have been searched with
>>>a zero window, and should hence be reliable.
>>
>>I think that you're right. My remarks apply to MTD only.
>
>It is actually the same reason why it's so difficult to get a good pv when using
>MTD.


So, may be Fritz has changed to MTD ?
We'll ask Frans or Mathias in Paderborn.

Uli

BTW, don't play soccer these days.
>
>Tony
>
>>Uli
>>>
>>>--
>>>GCP



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