Author: Robert Hyatt
Date: 13:14:52 08/24/05
Go up one level in this thread
On August 24, 2005 at 16:12:51, Peter Kappler wrote: >On August 24, 2005 at 15:11:46, Robert Hyatt wrote: > >>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... > > >What's the deepest mate you've seen in the 6-man tables? > >-Peter I really haven't looked, but I know it went past the 8 bit value limit which is roughly +127 to -128.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.