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Subject: Re: Lower bound of mate in n in the hash table

Author: Robert Hyatt

Date: 17:13:45 07/25/02

On July 25, 2002 at 19:24:06, J. Wesley Cleveland wrote:

>I see that crafty does not store lower bounds of MATE-n in the hash table,
>rather changes them to MATE-300. Bob wrote that he had search instabilities
>before he did this. Normally, this does not matter, but I think it makes crafty
>considerably slower in finding mates, as it only gets cutoffs on exact scores.
>Do other people have experience in this ?

Note that all this does is slightly decrease search efficiency.  I do store
_exact_ mate scores as they should be stored.  I store "bounds" that are based
on MATE as MATE-300.  The penalty is _very_ small unless you have a position
where almost everything leads to a forced mate of some sort...

Re: Lower bound of mate in n in the hash table J. Wesley Cleveland 12:06:23 07/27/02
- Re: Lower bound of mate in n in the hash table Robert Hyatt 10:02:01 07/28/02
  - Re: Lower bound of mate in n in the hash table J. Wesley Cleveland 21:28:05 07/28/02
    - Re: Lower bound of mate in n in the hash table Robert Hyatt 08:00:30 07/29/02
      - Re: Lower bound of mate in n in the hash table J. Wesley Cleveland 09:56:33 07/29/02
        
        Re: Lower bound of mate in n in the hash table Robert Hyatt 20:08:59 07/29/02
        
        Re: Lower bound of mate in n in the hash table J. Wesley Cleveland 09:17:43 07/30/02
        
        Re: Lower bound of mate in n in the hash table Robert Hyatt 09:49:38 07/30/02
        
        Re: Lower bound of mate in n in the hash table J. Wesley Cleveland 13:25:52 07/30/02
        
        Re: Lower bound of mate in n in the hash table Dieter Buerssner 12:35:55 07/29/02
Re: Lower bound of mate in n in the hash table Russell Reagan 00:09:34 07/26/02

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