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Subject: Re: PVS and aspiration windows

Author: Bas Hamstra

Date: 11:32:29 08/06/04

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On August 06, 2004 at 08:44:32, Tord Romstad wrote:

>A basic question from a PVS newbie:
>
>How much of an improvement should I expect to see when I introduce aspiration
>windows in a PVS search?  When using an aspiration window of +- 0.5 pawns,
>I don't see any improvement at all compared to a window of +- INFINITY.  In
>most positions, the node counts differ by just a couple of % (and the version
>with aspiration is not always the fastest).
>
>Is this what I should expect, or should I start looking for a bug?
>
>Tord

I faile to see ANY improvement with aspiration window and therefore have stopped
using it years ago. I remember Tony Werten confirming my experiences back then.
It simply doesn't help me.

Bas.



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