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Subject: Re: A Question on simple Alpha-Beta versus PVS/Negascout

Author: Ernst A. Heinz

Date: 11:27:45 03/22/00

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Hi Andrei,

>In my chess program Freyr I've used simple alpha beta from the start, each time
>I tried to change it to pvs/negascout it didn't work as expected because it
>just generated too many nodes. Does anyone else experienced this behavior ?
>Is there a logical explanation for this ?

PVS requires good move ordering to work well. Otherwise, the frequent
researches kill its performance.

Assuming that your PVS implementation is okay, I would conjecture that
your move ordering represents the limiting factor here.


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