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Subject: Re: Null move mate extension

Author: Robert Hyatt

Date: 06:22:44 06/25/99

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On June 25, 1999 at 02:29:45, James Robertson wrote:

>I implemented the threat exension in the null move (if the null move returns
>that we were mated, then extend), and I almost _never_ get any extensions this
>way. Maybe 3 or 4 times in an entire search, if that many. How many is normal?
>Do I have a bug? Any help is appreciated.

What happens if you call Search(-500,-400,etc)?  Can you (from the next
ply) return a value > -400, so that you can actually pass the MATE score
back to the previous ply (fail-soft) or do you just return -400 (beta)
which won't trigger the extension?

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