Author: Robert Hyatt
Date: 12:11:46 08/24/05
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On August 24, 2005 at 14:24:08, Ryan Peters wrote: >Can anyone verify that the 6man EGTB files Kbp v Kbp from the Crafty site >ftp://ftp.cis.uab.edu/pub/hyatt/ are "clean" ? > >I have downloaded the 7 files twice now. > >kbpkbp.0.nbw.emd >kbpkbp.1.nbw.emd >kbpkbp.2.nbw.emd >kbpkbp.3.nbw.emd >kbpkbp.4.nbw.emd >kbpkbp.5.nbw.emd >kbpkbp.6.nbw.emd > >The Wilhelm utility v1.48 flags all as "defective" and in particular says that >the last one kbpkbp.6.nbw.emd is corrupted. This is the lastest version of >Wilhelm, but I am not sure that I trust this utility :). When I try to use them >in either Deep Shredder9 UCI GUI or the lastest Chessbase GUI I get "wierd" >results. I am successfully using many other 6man EGTB's downloaded from the >Crafty site. Just this set is causing problems. > >Ryan You might need to wait for the next version of that program. Prior to building one of these tables, eugene has only a "gut-feeling" about whether an 8 bit value is enough or not. He then plugged in his "gut feeling" into the egtb.cpp code and we distributed it to the world. Every now and then his "gut" was wrong, and there is a deeper mate than expected, which requires a 16 bit value rather than an 8 bit value. This is encoded in the egtb.cpp source file and requires a simple change to update. The current crafty source has the most recent egtb.cpp changes if you want to compare to see what is probably wrong... You either need a new egtb.cpp, or else don't try to use that particular set of table files...
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