Author: blass uri
Date: 11:27:37 09/01/99
Go up one level in this thread
On September 01, 1999 at 09:39:58, Robert Hyatt wrote: >On September 01, 1999 at 08:49:23, blass uri wrote: > >>On September 01, 1999 at 07:56:29, Robert Hyatt wrote: >>>What is happening here is that Hiarcs is using some unsafe evaluation (IMHO) >>>to say that two minors vs one minor is a draw. Rebel lost a game making this >>>assumption in the WCCC as Uri pointed out. >> >>Rebel evaluated KBB vs KN as 0.xx pawns advantage for the BB and not as a draw. >> >>>I don't call KBN vs KB a draw. Most are. But _all_ are _not_. It makes you >>>look like a genius when it is right. And like an idiot when it is wrong. I >>>prefer the database approach which is 100% right. >> >>The problem even with tablebases is with KBN vs KBP >>In this case you can go by search for KBN vs KB by sacrificing the pawn but if >>you cannot go by search to KBN VS KB your evaluation will be clearly wrong. >> >>I do not say that the static evaluation should evaluate these positions as draws >>but it should evaluate positions of KBN vs KBP as close to a draw and crafty has >>not 0.xx evaluations for them. >> >>Uri > >It does for safe cases... and it used to for other cases. IE KNN. many programs >say the KNN side can't win no matter what. But if the other side has a pawn, >it can be a win and they screw up. I let the tablebases handle that one now. >There are other cases. As far as rebel, does it matter whether it says +.5 or >0.0? It was wrong (seriously wrong) in either case as the two pieces won. And >that is the 'unsafeness' I try to avoid. It is important if Rebel says 0 or 0.5 because if you say 0 for KBB vs KN then you may miss an easy draw that you evaluate as 0.00 and if you say 0.5 you can not miss an easy draw. KBB vs KN you can deal with tablebases but you have not tablebases for KBN vs KBP so you cannot avoid unsafeness in this case. Uri
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