Author: William Penn
Date: 14:55:12 12/10/00
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Please take a close look. I believe that James T. Walker has put his finger on the evaluation problem as expressed in scores: There is apparently a bug when scores are in the range of +1 to -1 which fails to put a minus sign on negative scores. The minus sign is only affixed to the score when it is less than -1. WP On December 10, 2000 at 17:11:19, James T. Walker wrote: >On December 10, 2000 at 16:58:07, William Penn wrote: > >>To Jeremiah & James... >> >>Thanks to Jeremiah Penery and James T. Walker for your replies and suggestions. >> >>For some unknown reason, I am unable to post a reply in the original thread >>below. I just get a message saying the thread doesn't exist, hasn't been posted >>yet, may have been deleted...etc. I may have a corrupted cookie, or something. >> >>There is a dearth of documentation about CM8000, and nothing in the instructions >>about such things. We are apparently dependent on John Merlino to come along and >>fill in the gaps, insofar as he knows the solutions/answers. I've heard from >>him before on this subject, and am not sure that he knows the answer. It may >>require the chess engine's author to take a look at it in a very patient way, if >>he is willing, but that could be a problematical proposition too!? >> >>Bottom line: I can't be confident in CM8000's scores generated when evaluating >>positions, and that's pretty fundamental. >>WP ><snip> > >Hello William, >I have finally been able to understand the problem. You are right about >ChessMaster 8000 having a problem with the scores! All scores below 1.00 are >positive even when black is winning. As soon as the score goes over 1.00 for >black the scores show the minus sign. This is a definite error in the GUI. I >don't think the engine has a problem since it is playing so well (except for not >using it's time). I think it's just a bug in the scores below -1.00. I just >finished a game in which the score was around 0.97 and I'm sure black was ahead. > The scores then bounced from 0.97 to -1.01 back to 0.91. I'm sure the position >was not that wild. It's just that all scores below 1.00 are positive. I have >noticed this before but could not put my finger on the problem. I noticed that >ChessMaster seemed to always think white was winning untill something drove the >score past -1.00. Then it shows scores like -1.21 indicating black is winning. >This is definitely a problem for John to pass along. >Jim
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