Author: Mike S.
Date: 01:20:41 11/27/05
The engine-neutral openings book for the Fritz GUI "PB12moves" is now available for free, from the CSS Online downloads: http://www.computerschach.de/index.php?option=com_remository&Itemid=52&func=fileinfo&id=51 Some notes: It was generated from ~83,000 master games, minimum 2500 Elo for one player, and several other criteria like no short draws. The maximal length of book variants in the PB12moves is 12 moves (24 plies). It is possible that in seldom openings, fewer moves are played from the book. It contains a total of ~592.000 positions, unzipped file size is 49,5 MB. The download file (zip) is ~16 MB. The recommended book settings (press F4) to use the PB12moves are "normal" and in engine matches, the option "Alternate colors" = on. To keep the original status of the probability factors, it will be easiest to use it with the files being write-protected. Important note: The book has been edited and contains adjustments of probability factors (move weights). If you like to use it with writeable files to allow book learning, please use a working copy and/or keep the download file as a backup, because: If you would later decide to reset the weights (to remove the learn effects), you would not get the original PB12moves version anymore! In this case, please use the zipfile again, or a backup. About UCI or WB. engines in Fritz: Many of these will have their own opening files, in other file formats, in their folder. For a truly "book-neutral" match using the PB12moves or any other neutral CTG book, it would be required to deactivate these engine-specific books. How this is done, depends on the engine, each. Some have an engine settings option for it, others may require to temporarily rename the book file etc. (This last note does not apply to cb-native engines.) Regards, M.Scheidl
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