Author: Uri Blass
Date: 08:45:29 01/28/05
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On January 28, 2005 at 10:55:23, Norm Pollock wrote: >On January 28, 2005 at 10:44:59, Matthias Gemuh wrote: > >>On January 28, 2005 at 09:19:47, Norm Pollock wrote: >> >>>Stefan, >>> >>>I would like to ask you why the commercial engines do not use a double book - >>>one book for moves as white and another for moves as black. By using one book, >>>based a single collection of games, black for example, is basing its opening on >>>games that black lost. >>> >>>-Norm >> >> >>The book is basically 2 books in file because the side to move is part of the >>hash key used to probe the file for moves. >> >>/Matthias. > >From an operational standpoint I agree that the book is really 2 books. > >I am considering how the book (or 2 books from an operational standpoint) is >created. It is created from pgns that have games of 1-0, =-= and 0-1 in them. So >white is using "its" book based on pgns that include 0-1, and black is using >"its" book based on pgns that include 1-0. > >Uri's comment about Fritz shows that Fritz handles this by commenting out some >weak moves. But how complete and accurate could this be? Isn't it better to >first base an opening book on games white (for example) won or drew against a >highly rated opponent, and then require a high frequency for any move to be >entered into the book? This is almost the way that I do it in movei The public book for white is based only on games that white won and I need minimal frequency of 5 times. the public book for black is based only on games that black got at least a draw and I need minimal frequency of 5 times. I think that the games are all games of GM's that I downloaded from the internet. I do not think that the way that I do it is optimal and I doubt if using statistics to decide about moves is a good idea because it is possible that a move was considered as good in the past and later some refutation was found. I think that some expert who write the book manually is better and I think that sandro writes the commercial book for shredder manually so I expect shredder uci to have better book than the book that movei has. Uri
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