Author: blass uri
Date: 11:57:44 04/01/99
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On April 01, 1999 at 13:25:18, James T. Walker wrote: >On April 01, 1999 at 06:53:22, blass uri wrote: > >>On April 01, 1999 at 06:24:43, Sylvain Renard wrote: >> >>>On March 31, 1999 at 18:01:28, James T. Walker wrote: >>> >>>>Hello again Sylvain, >>>>Obviously you know more about these things than I do. As I said in an earlier >>>>post I'm not a programmer or even a good chess player. But I still keep coming >>>>back to the CD ROM as the problem. I don't know if Fritz uses Ken Thompsons >>>>database or what. Fritz does not do a normal "search" on this move. Fritz >>>>seems to read the CD ROM and then make the wrong move. The info which shows up >>>>in the move window indicates Fritz has incorrect information about the value of >>>>the moves in the move list. Where do these values come from? All moves have a >>>>score of draw so it does not matter which one it plays. Evidently the first >>>>move "generated" or looked at is f8=B and it plays that move. >>> Hello again, >>>when reading the databases, if the position reached is not found, Fritz has to >>>assume it is a draw. What else could it do? >> >>It does not have to assume it is a draw. >>It is only a stupid choice of the programmers of Fritz and I do not understand >>the reason that they do not fix it. >> >>It can use the engine to evaluate the ? positions and use the evaluation of the >>engine as the score. >> >>Uri > >Hello Uri, >I've just discovered more information about this problem. Today when I booted >up my computer and tried the position again it played f8=B ? This with the new >CD ROM and SP1 !? So there is some variation in what Fritz5.32 plays each time >it is started even though it is "Playing" from the CD ROM in this case. It may be a function of the history of the game. I found that the evaluation of Fritz for the same position in regular search may be also a function of the history of the game and not because of a repetition. It happened in one case when the last move was a capture and the evaluation was different when I gave Fritz only the final position after the capture. Another >interesting developement is if you play out the moves by playing f8=R , Fritz >then searches normally and selects RxR. But the surprise comes next if you let >Fritz make the next move it calls for the CD ROM again and shows (#14) Rxf8 ! >In other words it finds mate in 14 from the CD ROM ! It is not surprising because after Rxf8 the position is KR vs KR and Fritz has tablebases for KR vs KR. Uri
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