Author: James T. Walker
Date: 14:19:26 12/10/00
Go up one level in this thread
On December 10, 2000 at 15:16:23, Uri Blass wrote: >On December 10, 2000 at 13:16:06, James T. Walker wrote: > >>On December 10, 2000 at 11:47:15, Uri Blass wrote: >> >>>On December 10, 2000 at 11:35:10, Daniel Chancey wrote: >>> >>>>The personality, Chessmaster8000 (HB=16) found Rd5+ at 5:34 although the score >>>>increased from 0.47 to 0.55 (favors white). The move stayed through 10 minutes. >>>> >>>>Castle2000 >>> >>>Black played Rd5+ so if the score increased from 0.47 to 0.55 then the score has >>>to favour black. >>> >>>Uri >> >>Hello Uri, >>In ChessMaster a + score is good for white so an increasing + score is even >>better for white. I gave the position to Rebel Century 3.0 on my Athlon 900 and >>it finds Rd5+ after only 16 seconds but changes to Rb4 at 28 seconds. Then it >>switches back to Rd5+ after 1:06 and keeps it past 6:45 and 12 plies with a >>score of 0.91. I guess it will stick with it. >>Jim > >Hello Jim, > >I do not have chessmaster8000 so I do not know the meaning of the scores of it >and I used simple logic. > >Simple logic says that if Chessmaster changed its mind about the best move the >score should be better for the side to move(black). >Simple logic says that if the score was +0.47 for white then the score cannot be >changed to 0.55 pawns for white when chessmaster suggest another move for black. > >I can explain behaviour like this only by hiding part of the information or >lying about scores. > >Chessmaster needs to see a fail low for the move with evaluation of +0.47 for >white. >If chessmaster does not tell that the customer that it found a fail low for the >move with evaluation +0.47 for white then it is hiding part of the information >about the scores. > > >Another possibility is that there are cases when chessmaster fails low without >solving it and that the score of chessmaster is only a bound for the real score. > >I can understand if the score is changed from at least 0.47 pawns for white to >exactly 0.55 pawns for white(assuming that chessmaster decided not to solve the >fail low problem) but in this case the score should be >=0.47 for white that >should be translated to a number that is bigger than 0.55. > >If chessmaster says 0.47 for white and not >=0.47 pawns for white in this case >then it is lying about the score. > >Uri Hello Uri, I think you are right. I just posted an answer to another thread to William about the scores of CM8K. All of it's scores below 1.00 are positive. I assume this is a bug in the GUI and simplly printing the scores on the screen without the "-" for scores below -1.00 when black is winning. So in the above the scores should have had a "-" in front to indicate black is better. I hope this will be fixed in the patch. Jim
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