Author: Bas Hamstra
Date: 14:18:50 06/12/00
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Robin, First I have no experience with extracting the PV from Hash. But I cannot see why it wouldn't be possible. And in fact I am just about going to try it. In stead of backing up the PV, as Hyatt does, I don't see why you cannot do the same thing in the hashtable, using a clever "don't overwrite" scheme. You just can do the same with a different datastructure. The hashtable can contain more info than available in the normal backed up PV, for intstance when an exact score is delivered from the hashtable, you lost part of the PV. Unless you so something about it, using the hashtable. Then: why not use it in the first place? Regards, Bas Hamstra. On June 11, 2000 at 20:55:15, Robin Smith wrote: >I have heard it said before in this newsgroup, that the reason PV's that are >displayed sometimes have nonesense moves, moves that give up material for no >reason for example (I have even seen ILLEGAL moves displayed in PV's!), is that >hash tables allow a program to know WHAT the evaluation of a position is but not >HOW (true PV) it came about. Is there ANY way to have programs only show those >moves that can be KNOWN to be part of the PV that leads to the eval being >displayed? > >The reason I ask is that I think the present way of displaying PV's is >misleading to non-programs such as myself. One often hears comments like "the >computer plays the right move, but for the wrong reason". Probably many times >it is for the RIGHT reason, but the PV that was displayed does not display the >reason. Anyway, I think NO information is usually better than WRONG >information. I would much rather see a short but accurate PV than a long and >misleading one. I mean to say, ILLEGAL PV's?? Come on. It must be possible to >do SOMETHING better than this! > >Programmers out there, what are your thoughts? Also, any estimates as to what >percentage of displayed PV's DO and what percentage DON'T display the correct >moves (the line that leads to the eval being displayed)? > >Robin Smith
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