Author: blass uri
Date: 00:56:08 03/29/99
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On March 28, 1999 at 23:08:45, blass uri wrote: > >On March 28, 1999 at 22:54:53, blass uri wrote: > > >>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+ > >This is not a good example because it is a private case of all the examples with >mistakes about draw for the stronger side but I found that the tablebases assume >that every promotion not to a queen is a draw in KRP vs KR and I did not succeed >to compose a problem when the only way to win with KRP vs KR is an >underpromotion. > >Uri I found a position when Junior (using tablebases) goes wrong in the winning side of KRP vs KR 6R1/7k/5P2/8/8/8/7r/K7 w - - 0 1 Fritz's tablebases show the right winning move 1.f7 (8) (I do not understand the 8) but after this move the tablebases show for black Rf2 with draw. After 1...Rf2 tablebases show 2.f8B as the first move instead of 2.f8R with an easy win for white. I am not sure about the result of 2.f8Q, the only question is if black has a perpetual check and I did not analyze this position and did not check it with KQR vs KR tablebases. Uri
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