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Subject: Re: Theory: Deeper Search creating worse performance due to PE

Author: Dan Andersson

Date: 15:57:25 01/04/06

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 Mini-max is the base search variation.
 It is trivially true that move selection by mini-max can change by going
deeper.
 In random trees a constrained mini-max search can certainly be degenerate.
 Considering the heuristic nature of chess evaluations there is a non zero
probability that you will search a degenerate tree.

 This will be exceedingly rare in practice. Mainly due to the fact that
positions in chess tree search are not independent. But also due to search
enhancements such as extensions and quiescence search.
 There exists classes of games that are intrinsicality degenerate.

MvH Dan Andersson



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