Author: James T. Walker
Date: 20:13:30 03/28/99
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On March 28, 1999 at 22:54:53, blass uri wrote: <snip, snip> > >On March 28, 1999 at 19:37:23, James T. Walker wrote: > >>On March 28, 1999 at 14:04:00, blass uri wrote: >> > >The point is that I did not find example when the "database" is wrong if it is >win for the stronger side in KRP vs KR > >I found that the database may be wrong for KRP vs KR if underpromotion is the >only way to win but I did not find an example for this case. > >The database may be wrong if it tell a draw for the stronger side and here is an >example: >1r5K/3Pk3/3R4/8/8/8/8/8 w - - 0 1 > >tablebases say the losing d8B+ > I don't understand this example either. My Fritz plays d8=Q+ which wins. >>Please explain to me what you mean. >>Jim Walker > >"Fritz" probably uses tablebases based on Ken Thonpson's endgame databases for >KRP vs KR >These databases tell only the distance to conversion for the stronger side and >do not discover another information. What other information can there be? If the stronger side has a "Win" then the weaker side is lost so what else do you need to know except the winning move. You can't expect it to have a saving move for the weaker side if it is lost. > >Stupid Fritz probably translate the no information in the database to draw. > >I think that the tablebases in the CD are based also on small wrong search. > >I posted an example when fritz say mate in 13 against itself instead of mate in >1 about underpromotion for a rook in 25/03 1:03 >Fritz has no information about KQvs KRR and the only explanation is that the CD >is based on small search of KxR after the underpromotion. > > >Uri I did not see this. I will go look for this Jim Walker
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