Author: Tony Werten
Date: 02:34:29 10/23/03
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On October 23, 2003 at 04:43:31, Sergei S. Markoff wrote: >Hello! > >>In case you forgot, the evaluation can just return 1 score > >Oh when I was such simply guy >Than I was clean and brave :) > >>score it can't return 2 scores for either positional or tactical matters. > >The matter is not about the returning more than one score in search. The matter >is to use eval disequilibrium in current node to make some descisions. It can >affect search or evaluation itself. > >But, anyway, it's not impossible to use two scores. One example Centaur program >which uses two evals - pessimistic and optimistic. It's allows to produce good >cut-offs where optimistic eval < alpha or pessimistic > beta. I don't know >detatil but it seems to be interesting concept. Not really. It has been used for years, only most people use the term lazy eval. Pessimistic score: simple eval-maximum positional score Optimistic score : simple eval+maximum positional score You can replace " simple eval" with "1/3 of the normal eval" or "fast part of normal eval" etc. Tony > >In my case I'm talking not about rebuilding whole search scheme but about more >clever using of eval. to guide the search (basic SmarThink concept is to make >search knowledge-based). But it's also about evaluation - what score must return >eval in a case of losing one or two pawns vs lot positional advantage (king >attack, passed score)? > >Best wishes, >Sergei
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