Author: Uri Blass
Date: 12:08:17 07/30/01
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On July 30, 2001 at 14:48:28, Pete Galati wrote: >On July 30, 2001 at 14:23:40, William Wentworth wrote: > >>The maximum depth for an opening book is 40 plies. >>That is what the ChessBase T-notes recommend. >> >>What is the reason for that ? >>1. Huge files on disk ? >>2. Too much time building the book ? >>3. After move 20 moves can hardly be called opening moves ? >> >>Can opening books that are too deep be disadvantageous ? >> >>Weeping Willow >>(hopelessly making vain attempts to build one's own opening book) > >After a certain point in any game you have in the database you're making an >opening book from, you'll be beyond the well thought out opening moves, and into >the player's own judgment calls. Depending on the player then, those moves may >be pretty good, or they may be pretty bad. > >Also, you have to let the program play it's own style of game/tactics, so if you >made an opening book for Fritz (for example) that went to excessively deep >plies, and you used only games by a drawish type player, then that player's >moves would be rather unlike Fritz's, and like I said, the program's got to play >it's own game. My opinion is that building a book without checking manually positions that were not played in a lot of games is a bad idea. I believe that you may need more than 40 plies in the book in order to avoid some traps unless you are careful to include only quiet moves in the book so I do not understand the reason for maximal depth of 40 plies. > >Yes, it takes longer to build the books as the plies get deeper, and they do >tend to get big. I do not understand why the number of plies is important. I think that the size of the book is important here. It is possible to have a small book when the maximal depth is 41 plies and a big book when the maximal depth is only 40 plies. Uri
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