Author: Robert Hyatt
Date: 09:56:33 02/27/06
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On February 26, 2006 at 22:50:22, Tom Dyer wrote: >On February 26, 2006 at 19:43:06, Mike Byrne wrote: > >>For the blitz tournament, I disabled the bookc.bin and it seemed to get better >>openings and had a much better result. > >>A good book is still very important and there was hardly any book preparation >at all - except for turning off bookc.bin. My bookc.bin seemed to guide >Crafty to terrible lines with the black pieces and it repeated a terrible >Sicilian line twice. > >Mike or Bob, sorry if you've already clarified this before somewhere, but I was >wondering if you can help me understand Crafty's optional bookc.bin and when to >use it / not use it. On some other sites/posts I've seen the following: > >"Bookc.bin which you can download with Crafty is in fact no more than a ordinary >books.bin file...It was built from the file start.pgn but after removal of >unsound , especially gambit lines to ensure that a more suitable book can be >built against other computers." > >This would seem to indicate that it is recommended to use bookc.bin in computer >matches, but I've also received the advice to remove it even in computer >matches. Bookc.bin (from the UAB ftp site) seems to do more than restrict >unsound gambit lines, in my results I've only seen it play 1. D4 from White. > >Congratulations on the continued good performance of Crafty :) >Thank you, >Tom Here is the simple explanation: 1. book.bin is the main book file. Crafty will play openings from this file if they exist... 2. bookc.bin is a "computer opponent book" and normally has very few moves in it, augmented by the "play 50% or play 100% type modifiers". If Crafty finds a bookc.bin when playing a computer, it will play those moves as instructed, and it will not play moves with a "play 0%" or "?" modifier if there are openings you want to avoid. 3. books.bin is the same as bookc.bin, but used only against non-computer (meaning humans only) opponents. The idea is that books.bin/bookc.bin are very small and easy to maintain, and you modify those to choose/avoid specific openings. You can also create additional such .bin files and attach them to a specific player's name. I added this from GM Roman D. a few years back when he wanted to practice one particular d4 opening over and over, I set up a roman.bin that only played 1. d4 as he requested... hope that helps. The crafty doc file also has a very complete explanation of this near the end...
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