Author: Uri Blass
Date: 03:19:14 10/23/03
Go up one level in this thread
On October 23, 2003 at 05:34:29, Tony Werten wrote: >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 This is not what I think about when I read pessimistic and optimistic. By this definition the difference between passimistic and optimistic is constant. I think about calculating 2 bounds when in quiet positions the difference between the bounds is small when in not quiet position the difference is big Uri
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