Author: Henrik Dinesen
Date: 06:16:43 01/04/06
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On January 04, 2006 at 01:45:42, William Penn wrote: >On January 03, 2006 at 09:44:25, Dr. Wael Deeb wrote: > >>Hi to all, >> >>http://www.exactachess.com/modules.php?name=Downloads&op=getit&lid=28 >> >>The opening book is about 74 Mb unzipped.... >>This is my contribution for the computer chess community for the year 2006! >>A special dedication for Graham Banks and Majd Al-Ansari :-) >>Enjoy and be happy, >>Dr.Wael Deeb > >Thanks, but I downloaded it, and it doesn't work correctly in my CB GUI from the >Shredder 8 CD. The number of games is incorrect, at least in the lines I tried. >Instead of decreasing to 0 games as the lines proceeds to greater move numbers, >the number of games remains high in the region of 4000. Also the percentages are >flat, showing a flat 50% after awhile. Perhaps I don't understand the purpose of >the book. But I have many other .ctg books, and have prepared many .ctg books >myself, and yours doesn't behave like anything I've seen before!? > >I see 83172 games in ibase+.ctg in the starting chessboard position. The number >of games N decreases normally for the first few moves in the following opening >line: > >1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nb5 d6 6. c4 Nf6 7. N1c3 a6 8. Na3 >Be7 9. Be2 O-O * > >In the final position here it still shows N=4176 games: 1378 1-0, 1423 1/2-1/2, >1375 0-1. That is at least 3x more than is possible even if you used the largest >chess database in the world to prepare the book!? My largest personal database >of 3.5 million games has only 1374 games in the final position here. >WP Deliberately manipulating stats in a book isn't new. It would seem that that's what Wael did (?), reffering to a earlier discussion a few days back. Henrik
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