Author: Uri Blass
Date: 03:46:45 09/05/00
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On September 05, 2000 at 06:45:16, Uri Blass wrote: >On September 05, 2000 at 04:59:24, Uri Blass wrote: > >>On September 05, 2000 at 02:15:40, Albert Silver wrote: >> >>>On September 05, 2000 at 01:17:43, Jouni Uski wrote: >>> >>>>From Franklin Campbell: >>>> >>>>I admit I'm not computer chess expert (I sincerely wish we could have >>>>found one to operate the compute for these games). However, the Nalimov >>>>Tablebases provided to me by ChessBase USA are labeled for use with >>>>five or fewer pieces. In this case we still have seven pieces on the board, >>>>so I haven't even removed the shrink-wrap from the case holding the >>>>CD-ROMs. >>>> >>>>FYI Jouni Uski >>> >>>Apparently he didn't know that the tablebases are used in the search as well, so >>>they are best installed on the harddisk. It would be a good idea to double check >>>the past moves though and be certain Fritz wouldn't have deviated, and if so >>>when the earliest time was. >>> >>> Albert Silver >> >>Fritz6a has a tablebase bug and I am afraid that tablebases may be counter >>productive when the number of pieces is bigger than 5. >> >>I remember cases of a strange mistakes when programs without tablebases or >>Fritz6light with or without tablebases had no problem to see the right move. > >I see from looking at the ssdf games that these mistakes are rare so probably it >is better to use tablebases with Fritz6a. > >The biggest tablebases problem of Fritz was the fact that it was unable to win >KRP vs KR endgames because it had not the KRQ vs KR tablebases and simply >refused to do a queen from the pawn because it prefered mate in 22 by another >move than KRQ vs KR with lower evaluation. > >I also do not know if there are cases with more than 5 pieces on the board when >tablebases were counter productive for Fritz. > >I trusted my memory about stupid mistakes but I do not see clear examples for >it. > >I tried to find positions when Fritz6 drew games in the ssdf because of the >tablebase bug and I found one case of stupid evaluation in game 8392 of the ssdf >but it seems that in this case the evaluation can be a result of not >understanding KQ vs KP draws so not using the tablebases is not going to help >and the only solution is to use the tablebases correctly. Another solution is to have better evaluation but evaluating wrong KQ vs KP draws is a typical computer error. Uri > >Uri
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