Author: blass uri
Date: 09:20:55 10/11/98
Go up one level in this thread
On October 11, 1998 at 10:35:41, Robert Hyatt wrote: >On October 11, 1998 at 03:27:59, blass uri wrote: > >> >>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) >> > > >this was done, but on a 50 million dollar computer. Which is not going to >be available to any of us in a tournament... nor will the PC catch up to >the speed of that machine for 20-30 years... So there's no use planning on >being able to compute even a 5 piece file. IE KRP KR takes 80 hours plus >on a machine faster than a PC today (big alpha machine). >compute the promotion classes which take 12-24 hours each to build. I understand that one of the reasons for the long time is that you must use the harddisk because you have not enough ram. In KQvKR you have only less then 3,000,000 positions if you assume that the white king is in a1,a2,a3,a4,b1,b2,b3,c1,c2,d1 so you can store all the information in the RAM Does it help to generate the tablebases faster? Uri > > >>Some quesions: >> >>1)Is it possible to do it in personal computers if you have no problem of time? > > >yes until you add the "no problem of time." To compute the files needed to >to do KRP vs KR would take way over a week on the best PC around today... > > > >> >>2)How much memory was used by the supercomputer to build the table? >> > >many gigabytes... But even worse, 65536 CPUs were used... > > > >>Uri
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