Author: Norm Pollock
Date: 15:18:32 07/16/04
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On July 16, 2004 at 15:19:07, Sean Empey wrote: >I am curious about having a custom opening book built. Any suggestions on how to >persue this? Money is not a limitation as I have corporate sponsorhip. Although >I don't want to spend the entire sponsorship money on the book. > >Thanks in advance for your help and advice. > >-Sean I don't know what a "custom" book really is. I don't know if this will help you at all. This is my working plan to make opening books. One of my books (for the fritz8 gui) is available on Peter Skinner's crafty web site. I make up books from my own carefully pruned pgn file. This file contains single copies of games played 1940-2004. No duplicates or twins. And only long-time control human-human games over the board. No internet, no simultaneous, no blindfold, no correspondence, no email, no rapid, no blitz, no lightning games. No games with "FEN". Games from the years 1940-1969 are both players elo 2600+. Thereafter both players elo 2500+. I keep the file up to date through TWIC downloads. I also eliminate games with 20 moves or less. And I recommend the following settings when converting the pgn file into a book: depth=5 (position had to occur at least 5 times), no book learning (in fact I make the book read only). Book learning from computer games corrupts the statistics in the book. I want the stats to be based on human-human games. I also don't want duplicate or twin games to distort the stats. Certainly there must be "bad" lines in there. Unless I raise the depth to higher than 5, these lines will not be eliminated. But that would also eliminate a lot of good lines.
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