Author: Mike S.
Date: 18:50:16 08/03/04
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On August 03, 2004 at 20:58:05, Andrew Walker wrote: >Can someone please post a description of the 5moves.ctg book and how the lines >in it are selected. I did a web search and found a few pages in German that >looked promising if someone can translate the important bits. > >Eg. http://f23.parsimony.net/forum50826/messages/86999.htm The book depth is 5 moves (10 plies), 65.243 positions. It is based on database functions and automatic book generation functions (only), but I tried to carefully choose the games: 250.000 games with 2350 Elo minimum, 20 to 80 moves long. "Historic" games before 1970 have been supplied with ratings. Some games with illegal moves have been repaired or deleted. The book has learned from a large database of computer games (>30.000 games, 1990-2003), which should result in some general computerspecific tuning. Since there was no manual editing whatsoever, there could be some weaknesses (i.e. refuted opening moves which have been popular in the past). But maybe that risk isn't too big within the first five moves. No "unplayed theory" (=analysis) has been included. IMPORTANT: Use the 5moves.ctg with F4 book option "normal," NEVER "optimal"! (With optimal, the variety would be much too small and it would nearly always play the sicilian.) The tournament option has no effect since no moves are marked as tournament moves. The main purpose of the 5moves.ctg is, to use it as a "neutral" book for tournaments or matches, where all engines use the same book. By that, the engines have to finish the opening phase, and can create the early middlegame, themselves. The book is available from Permanent Brain's Downloads http://members.aon.at/computerschach/links.htm#downloads and from the CSS Freeware page http://www.computerschach.de/freeware/index.htm Regards, Mike Scheidl P.S. A "more normal" book - in Arena mainbook format this time - is based on the same database, but on ~12.000 games with 2600+ elo only, 20 plies deep. I think it can provide fairly good theory support for engines which have no own book. http://members.aon.at/computerschach/Arenabook2600.zip (487 KB) http://f23.parsimony.net/forum50826/messages/103696.htm (german)
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