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Subject: Re: PVS and aspiration windows

Author: Robert Hyatt

Date: 15:25:31 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

It is a modest improvement, but it definitely is an improvement.  IE it should
be most apparent in positions where the real score is about equal, but where
there are lots of tactics around.  The normal search won't be able to dismiss
all those unforced mates, while an aspiration search will cut them off
quicker...




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