horizon effect

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In computer game playing or other search processes, a large search tree has to be explored. It is usual to set a maximum depth limit (D) beyond which it is considered uneconomic to search further. The horizon effect refers to the fact that interesting results will always exist beyond any depth D and therefore in any given search will not be discovered. Variable evaluation functions and dynamic search-depth controls have been used in attempts to deal with this problem.

Subjects: Computing.

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