Author: blass uri
Date: 05:28:10 11/02/98
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On November 02, 1998 at 06:35:46, Bernard Nahrmann wrote: >I have a problem with Fritz 5 and this position : > >8/8/8/8/2k3p1/P3P1Pp/7K/8 w - - 0 1 > >I let Fritz 5 analyse this position in analyse mode ! >Showing one variation Fritz finds soon Kc3 = with value 0.0 ! >Showing two variations Fritz displays Kc3 and Kb3 with value 0.0 for eternity, >but Kb3 is a clear loss. Playing Kb3 Fritz sees this after a few seconds. >Showing three variations Fritz shows Kc5, Kc3 and Kb3 each with value 0.0. For >Kc3 and Kc5 this is o.k., but again Kb3 ?? >Showing four variations Fritz shows, that only Kc3 and Kc5 are =, Kb3 soon >disappears !!!??? > >I tried this with the current Fritz 5 engine with different hash sizes under >Fritz5.16, Junior 5 and Chessbase 7.0. I also tried it on different machines and >Win95 and NT 4.0. I did not try this position but I know from experience that fritz5 has a bug in the x variation mode. The bug is that the score of the move that fritz5 "thought" to be best cannot be lower than the score of the second best move. Example:suppose fritz5 "thinks" that the score of the best move (Kb3) at depth 8 is +2 and the score of the second best move (Kc3) at depth 8 is 0 then it cannot discover at depth 9 that the score of kb3 is lower than 0. If the score of Kc3 is never lower than 0 at depth 10,11,12,... then fritz5 never discovers that the score of Kb3 is lower than 0. Uri
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