Author: Mike S.
Date: 10:34:41 11/10/02
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On November 10, 2002 at 12:51:13, Bob Durrett wrote: >(...) >How do the engines select their opening moves when "dumbed-down" to play at the >amateur level? I suspect that they use the same opening book used against GMs. >Do they? Usually yes. I'm not sure at the moment if older Chessmaster versions had a "book depth" setting in the personality profile. I've recently suggested such a setting for Fritz 8. But the user can decide to use another book for "dumbed-down" play. For example, I have created an opening tree for the Fritz GUI, with variants only 6 plies deep each: http://members.surfeu.at/mscheidl/Kurzbuch.zip This book will be much weaker than normal opening books, but OTOH it may even be more difficult for a human amateur, when the engine continues with non-theoretical moves from the 4th move on. (Mainly, the Kurzbuch is intended for "book-neutral" engine matches. It contains ~20.000 positions.) Btw. it is possible to create such a book with standard GUI functions, from any database of games, in several chess programs. IOW, this provides an additional way to choose which openings are played from the book: You could i.e choose a database of less strong players to create the book from. >(...) an opening book to be used for training of a weak player might be >inappropriate for strong players and visa versa. I don't think so... because: >All of the opening books could be combined into a single opening book but with >a different set of move probabilities for each performance level. > >Do any of the programs do that now? Many professional GUIs let the user choose from different probability settings or opening types from within the same book. Also, freeware engines like Crafty have similar options to control the book usage. These options can even be relatively complex, including detailed settings of book learning and usage of the learning results. Therefore I think, for the opening studies and practise of a human chess amateur, a big good book will be best. He only has to care for a GUI which offers the options like mentioned above. Regards, M.Scheidl
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