Author: Dann Corbit
Date: 17:16:05 07/16/04
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On July 16, 2004 at 18:18:32, Norm Pollock wrote: >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, Why no correspondence or email games? I would think them to be the best of all (if the players are highly rated) >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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