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Subject: Re: Congratulations to IsiChess

Author: Uri Blass

Date: 06:49:16 11/14/02

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On November 14, 2002 at 09:45:37, Daniel Clausen wrote:

>On November 14, 2002 at 08:45:12, José Carlos wrote:
>
>[snip]
>
>>  I'm writing a new engine (MTDf) and, at this moment, I have nothing but
>>material score. It fails low for c3 at ply 5 and doesn't consider it anymore.
>>
>>  José C.
>
>Will you change the name of the engine or keep the old one? Also, may I ask what
>the reasons are why you chose to use MTD(f) for your new engine? (I personally
>think it's a fascinating search technique, but I'm a bit worried about search
>instabilities - like getting a fail high and after a re-search getting a
>fail-low)
>
>A curious Sargon :)

I do not use MTD and do not plan to do it but I have search instabilities.

I do not worry about them.
search instabilities are results of logical pruning rules.
I have pruning rules that are not null move pruning and even if you use only
null move pruning you can get search instabilities.

Uri



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