Author: James T. Walker
Date: 11:10:49 10/08/98
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On October 08, 1998 at 08:24:56, Robert Hyatt wrote: >On October 07, 1998 at 23:33:53, James T. Walker wrote: > >>I gave Fritz 5.16 a position /p4K/P////k// W. I think that I have that figured >>out right. Anyway, Fritz announces #14 after about 16 sec. But when you go >>through the moves it announces #13 twice, #10 twice,#8 followed by #9 etc. It >>jumps from #6 to #4 no matter what move I make in that position. After that it >>counts on down to mate properly. It ends up with about a mate in 17. What >>causes this phenom ? Crafty with the same position announces #17 on the first >>move then while pondering it finds mate in 15. After that it counts down by one >>to mate. That seems fairly normal. >>Jim > > >This happens... In the case of Crafty, I assume you are using databases, >which means it will never screw up... but without databases there are two >kinds of mates... ones with mostly checks, and ones with quiet moves mixed >in. Mostly checking lines are easiest to find at shallow depths because we >extend on checks, while "quiet" moves can cause a search to terminate without >finding the mate. So you can see longer mates quicker, and if you stop a >search after finding a mate, you might not find the shortest. In non-databse >mates, this happens to crafty all the time, too... Actually I don't have any databases/tablebases. I couldn't find them at your site. I'm going to look again today. Crafty played the position perfectly without them. That's why I couldn't understand Fritz 5 going from #8 to #9 ?? Jim Walker
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