Author: Ricardo Gibert
Date: 22:15:22 11/18/00
Go up one level in this thread
On November 18, 2000 at 22:13:35, Peter Kappler wrote: >On November 18, 2000 at 21:23:54, Ricardo Gibert wrote: > >>On November 18, 2000 at 12:37:20, Amir Ban wrote: >> >>>On November 18, 2000 at 06:03:39, Graham Laight wrote: >>> >>>>On November 17, 2000 at 19:24:23, Amir Ban wrote: >>>> >>>>> >>>>>If your criterion of knowledge is based on accuracy of evaluation then I >>>>>respectfully apply for membership in the exclusive "knowledge based" club (and >>>>>IMO some members don't belong there). >>>>> >>>>>BTW, accuracy of evaluation is the best criterion for being knowledgable that >>>>>I'm aware of. I've posted here in the past that, to start with, we don't have a >>>>>real definition of what good evaluation means. This is the focus of my work with >>>>>Junior for more than a year. >>>> >>>>IMHO, a truly accurate evaluation of a position would yield one of the following >>>>3 ordinal values: >>>> >>>>Win >>>>Draw >>>>Lose >>>> >>>>-g >>>> >>>>>Amir >>> >>>I can easily fake evaluation that gives only those values. I suppose that you >>>mean that the values should be true values. How do you propose to do that ? If I >>>have an eval that gives absolutely correct values 60% of the time (and the rest >>>wrong), do you expect my program to be weak or strong ? If I get 70% right, am I >>>necessarily stronger ? >>> >>>The question is, given two evaluation functions, to decide which is more >>>accurate. >>> >>>This is a good question. Your answer does not seem to lead anywhere. >>> >>>Amir >> >>With 100% correct evaluations of just win, lose or draw, can a program mate in K >>+ R vs K? I think it will just wander around unless mate happens to fall within >>the program search horizon. Yes? > >Yep, it would wander around until it lucked into a mate or until the "threat" of >a draw by the 50-move rule forced it to play a mating line. > >--Peter The 50 move rule may or may not force it to play a mating line. Example: Lets say the program has played 40 moves without pawn move or capture and is able to search only 20 ply. At that point, it may find that a draw due to the move rule is a problem, but may not be able to anything about it, since the position may actually require more than 10 moves (20 ply) to mate.
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