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Subject: Re: Aspiration Window sizes

Author: Uri Blass

Date: 13:51:17 03/14/05

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On March 14, 2005 at 15:04:22, Tord Romstad wrote:

>On March 14, 2005 at 10:25:15, Daniel Mehrmannn wrote:
>
>>bob says right, you must find your own way which size is good for your engine.
>>It depends on our eval. For example my engine have at the moment not a good
>>eval, so i use 50 window.
>
>And my engine, it seems, has the worst eval of them all.  Aspiration windows
>simply don't work for me, regardless of their size.  Glaurung does not use
>aspiration windows at all.
>
>Tord


I do not think that there is a connection between quality of evaluation and size
of aspiration windows.

I think that the question what works is more dependent on tricks that are used.
I use aspiration window of 0.60 pawns(score-0.30 pawns,score+0.30 pawns) and I
have simple rules how much to increase it in fail high or fail low but I did not
test that this is optimal and I have no idea what is optimal.

The only correct test that I can think about is by games and I need many games
and I had no testing time to do it.
I do not trust average depth because with different aspiration window pruning
may be different because the decison what to  prune is dependent on the window.

Uri



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