Author: Mogens Larsen
Date: 01:59:03 03/08/04
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On March 07, 2004 at 17:31:26, Uri Blass wrote: >I do not see it as easy to generate bog-standard book. >I first need to write a program to read a file of pgn games and find for every >position the most often played line and I also think that the most often played >lines may be bad because it is possible that a line was played often in >1990-2000 and was refuted in 2001 but you still have a lot of games from >1990-2000 when the line was played. > >Statistics about wins may be also misleading because the refutation may be based >on a single game when before the refutation you can get many wins for the wrong >side. It depends on the depth of the preferred lines. If you restrict it to 20-30 plies, the actual danger of running into a refutation is limited. Or at least as dangerous as playing without any rudimentary guidelines. I mentioned in the WinBoard forum that it's possible to automate book creation for Movei. The rough guideline is something like this: 1) Have a PGN collection available for black and white available. Maybe rudimentary selected by first opening moves, eg. e4, d4 and not b3 openings for white. 2) Cut the PGN using Yace down to 20 plies. 3) Run the result through Extract with flags that suppress everything but result tag (-Rtaglist) and ignore unique games (-U). The idea is to find doubles. Do it twice to make sure that the remaining games have been played at least three times. 4) Extract the unique games from this collection. You only need one version of each line in the book. 5) Use Yace to convert the collection to coordinate notation. 6) Use a texteditor to remove resulttag and unwanted space. If you have a Chessbase product, grabbing standard lines using commercial books and converting them is even easier. Regards, Mogens
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