Author: Norm Pollock
Date: 07:55:23 01/28/05
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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?
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