Author: blass uri
Date: 20:31:35 03/28/99
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On March 28, 1999 at 23:13:30, James T. Walker wrote: >On March 28, 1999 at 22:54:53, blass uri wrote: > >> >>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. Other information is about cases when the weaker side can win. Uri
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