Author: Mike S.
Date: 08:23:16 09/12/04
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On September 12, 2004 at 10:50:21, David Dahlem wrote: >On September 12, 2004 at 10:41:50, Mike S. wrote: >(...) >>Anyway, I can offer you another one to try. I created it very carefully: >>http://members.aon.at/computerschach/links.htm#downloads >5moves.ctg is a real nice book. I would like to try making an Arena .abk book >similar to this. Is the pgn used to create 5moves.ctg available? Thanks! Basically, the Arena book from the same download page above, 2600_20.abk, is based on the same game collection, but is twice as deep (20 plies) even! It's based on games with 2600+ Elo players (5moves.ctg on 2350+ Elos), and has ~50% more positions. The Arena book format obviously is much more compact but doesn't include the Elo performance info. The other main difference is that I couldn't let that book learn from 30.000 computer games, which I had done for the 5moves.ctg using a Fritz feature. The game database is available, but not free. I basically used a ChessBase Big Database (mine is from 1999, with some later additions) and selected ~ 12.000 games with 2600+ Elo, 20...80 moves length. But I think there are other large game databases available on the net which should provide a similar quality (as i.e. they don't need to be commented for this or the names also don't need to be perfectly standardized for book generation). An important point is to set the *book playout options* to reasonable settings before generating the book, because Arena saves them with the generated books as defaults, each. I decided to set the min. games to 2, min. won games 0, white percentage 45%, black percentage 35%, number of games one tick to +, win percentage one tick to - (and priority is not supported by my book). I admit I do not have very much experience with it. Maybe more "liberal" 40%/30% can prevent too early out-of-book effects, but with somewhat more risk of playing bad moves in less popular variants. Regards, Mike Scheidl
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