Author: José de Jesús García Ruvalcaba
Date: 09:34:42 07/16/99
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On July 15, 1999 at 21:04:47, Nicholas Cooper wrote: >Greetings all, > >I am considering purchasing Hiracs 7.32, an important factor being the use of >tablebases. However, I have noticed that all of the 5-man tablebases require >about 10 GB of disk space to store (ouch!). Given that I only have 2 GB of hard >drive space available for tablebases, I was thinking of how one might reduce the >number of 5-man tablebases included *without* drastically affecting the strength >of endgame play. What do you think of omitting some of the promotion tablebases: >for instance, after promoting the pawn in a KRP-KR endgame, is it really that >helpful to have the KRQ-KR endgame tablebase? It's true that this may change the >number of moves it might take to make but surely not the result. Granted this >might muck up the number of moves to mate prediction when promotion occurs but >from a practical point of view, this doesn't matter as long as the result isn't >changed. > >What does anyone think?? Any other suggestions for how to chose a good 2 GB >subset of the 10 GB 5-man tablebases are welcome. > >Thanks in advance for any help you can offer. > >Regards, > >Nick Cooper If you have a tablebase with a pawn, then all the promotion classes are required. Otherwise expect weird behavoir, as has been reported by many people and for more than one program. The advantage of Nalimov tablebases is that they are currently supported by a few programs, and I expect that more and more engines use them in the near future. José.
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