Author: Uri Blass
Date: 02:07:50 01/21/02
Go up one level in this thread
On January 21, 2002 at 03:59:55, David Rasmussen wrote: >On January 20, 2002 at 19:21:07, martin fierz wrote: > >>On January 20, 2002 at 16:21:02, David Rasmussen wrote: >> >>> >>>I am not talking about things that depend on a lot of other stuff. Evaluation >>>should take care of this. I am talking about Crafty that explicitly checks for >>>some material special cases _and nothing else on the board_, and decides if it >>>should give a penalty/bonus. I say that I think it can be done with the values >>>alone. Why not? >>> >>>/David >> >>because all your examples above depend on a lot of other stuff maybe? that's the >>point i tried to make in my post: a single rook with pawn vs knight and bishop >>can have good chances in this pure endgame (+ a few more pawns each). in the >>middlegame nearly never. how would you want to encode that in your material >>values? > >I don't want to do that. I would want to add evaluation terms for that. Isn't >that necesary with 1,3,3,5,9? Yes it is. What I am suggesting is not catching >_all_ cases with material values, just to catch some more than one can with >1,3,3,5,9. And have fewer evaluation terms for special cases. I believe that is >possible. At least I haven't seen any arguments against it. It seems that most >people in this thread has misunderstood my question altogether. I guess that most programmers do not use the 1,3,3,5,9 because it does not make sense but I may guess wrong. I know that yace is not using the 1,3,3,5,9 and have other numbers and not everyone has numbers for only material. Not everyone calculate material score+positional score to evaluate position. Material+piece square table score can be evaluated at the same time and you do not have to calculate is as sum of material score and piece square table score. programmers may evaluate in one step the material+piece square table and later add other positional factors and they may use other ideas. Uri
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