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Subject: Re: The five largest (and smallest) problems

Author: Albert Bertilsson

Date: 13:06:40 12/15/03

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On December 15, 2003 at 15:48:25, Ingo Bauer 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.
>
>
>Great! I support that.
>
>Btw: Anyone with a problem like this: 1420336884963 nodes (!!!) 8780,82s
>161754KNPS (That was the 2200+ (1830MHz/512 MB Hash)
2.4 hours for a problem that size is really good! I guess it's that big hash
that helps alot.

Benny Antonsson worked for 15 hours on a problem about half the size, but I
suspect he is using a rather slower machine.

>
>WOW!
>
>Ingo

I think your problem is almost in the top 10 largest problem list.

Largest
1. 2261388536201, FredLouguet
2. 2133932114161, Joost_Buijs
3. 2033581441868, FredLouguet
4. 1928723054854, FredLouguet
5. 1700808960426, Joost_Buijs

FredLouguet and Joost_Buijs are crunching a massive amout of problems so it is
not very strange that also run into the largest.

Smallest
1. 21455063187, FredLouguet
2. 22194741468, FredLouguet
3. 49979755134, Scott Farrell
4. 50733025006, sorgenkind
5. 52295897336, sorgenkind

FredLouguet had the luck to find the really small ones too, notice that these
problems is less than half the size of third smallest.

It will be interesting to see the final largest/smallest problems.

/Regards Albert



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