Author: José de Jesús García Ruvalcaba
Date: 07:51:27 04/02/99
Go up one level in this thread
On April 01, 1999 at 08:19:57, James T. Walker 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? I think they did not think >>it was useful to include all the files resulting from an underpromotion. >> >> >>>Fritz 5.32 with >>>the Fritz 5.32 CD ROM does not play that move. It correctly has the score as >>>(8) 1.f8=R. Why does Fritz play the move correctly with the new CD ROM but >>>incorrectly with the old CD ROM? >> ?? I must have the old CD ROM because my Fritz 5.32 shows 0 as the score >>after f8=R. Could you look at the files in the root directory of your CD >>and tell me if the file Rr_r.g is present on your CD? Thank you. >> >>> Fritz does not go back to a regular search >>>routine untill after the f8=B move. >> This is a bug on my Fritz5.32 because it has the file Rb_r.g on the CD >>and does not use it when you enter a corresponding position. >> >> Best regards, >> Sylvain > >Hello again Sylvain, >Have you updated to the "March SP1" at Chessbase/Germany? Anyway here is a list >of all endgame files on my CD ROM. >Pq_q.g >Pr_r.g >Q_pr.g >Qr_q.g >Qr_r.g >Rb_r.g >Rn_r.g >So the Rr_r.g is not on the endgame CD. As I have said I don't see where this >is necessary since when you get to this position any program can win from there. >Since Fritz only searches the CD at the root you would have to already be into >this endgame before Fritz would search the CD and at that point it is not >necessary. Fritz must make the proper decision of promotion before exiting the >Pr_r.g file. It is still a KRP vs KR untill after the promotion in my opinion >and this file must have the correct info for this to work. >Jim Walker To make the right choice with a pawn on the seventh rank (which can promote to four different pieces), the promotion files are required. That is because "probing at the root" really means probing after a one-ply full width search. José.
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