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Subject: Re: DPerft trends

Author: Dann Corbit

Date: 12:54:44 12/15/03

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On December 15, 2003 at 15:48:50, Albert Bertilsson wrote:

>On December 15, 2003 at 15:41:27, Dann Corbit wrote:
>
>>On December 15, 2003 at 15:37:01, Albert Bertilsson wrote:
>>
>>>Hi great counters!
>>>
>>>Today the project progressed some 20%, dispite being in the toughest phase, from
>>>now on I guess it is downhill! Hopefully the project will be completed in two
>>>days.
>>>
>>>Of yesterdays new participants sfarrel (Scott Farell) proved to be a rocket,
>>>already has he completed close to 200 problems.
>>>
>>>A warm welcome to those who are new and as a note to Benny, you do know how to
>>>pick your problems (just completed monster problem that took a freaky 15 hours!)
>>>
>>>As the project have more participants it is getting a very nice pace, not as
>>>dependent on a few particular members any more. Of course even more participants
>>>would be nice, to really have a go at perft(12) over the Christmas holiday.
>>>
>>>So tell your friends to follow this link:
>>>http://www.albert.nu/programs/dperft
>>>
>>
>>Suggestion for another project:
>>Perform the same perft search, but spit out every checkmate and draw.
>>It would be useful theoretically to trim branches of the tree.
>
>Please explain in further detail what to use it for.

I don't know what I might use it for.  What I am thinking is that it may close
off whole branches of the tree.  So I can know (for instance) there is no use
analyzing some particular position.  It is, for all intents and purposes, dead.


>And what should be
>outputed.

An EPD record.

>Are there any draws that early?

I am guessing that there are 3-move repeats with the king side open.  Some are
probably blunders (a draw by ignorance), but some are probably forced (every
move is forced by one side).



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