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Subject: Re: saving space in 4 piece database(and questions about 6)

Author: blass uri

Date: 00:27:59 10/11/98

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On October 11, 1998 at 00:17:55, Robert Hyatt wrote:

>On October 10, 1998 at 14:51:56, blass uri wrote:
>
>>I think it is possible to save space by storing only win,draw,loss in these
>>tablebases
>>when you go to the position with 4 pieces you can generate the tablebase
>>
>>Maybe it is not practical for blitz but it can be practical for tournament time
>>control.
>>
>>Uri
>
>I would not want to generate either KBNK or KQKR on the fly...  because
>I probe *in* the search, and need the result then, not just at the root.

You will have the result because I did not say not o have the result of
win/draw/loss
>And KQKR can't be built in a couple of minutes by anybody yet...  the 3-4
>piece files take 3-4 *hours* to build, in total...

It is not important to build all the 3-4 pieces files but only the KQKR when you
get to the KQKR endgame and you can save it in the ram and not in the harddisk
so you are faster.

I read that before some years(I think in 1989 but I am not sure) a 6 pieces file
was generated by a computer  by 6 hours and it found mate in more than 200  in a
position of KRBvKNN or something similiar(it was done by a super computer andnot
by a personal computer but personal computers are today better)

Some quesions:

1)Is it possible to do it in personal computers if you have no problem of time?

2)How much memory was used by the supercomputer to build the table?

Uri



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