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• W1821960358 abstract "This paper proposes a new method for searching two-valued (binary) game trees in games like chess or Go. Lambda-search uses null-moves together with different orders of threat-sequences (so-called lambda-trees), focusing the search on threats and threat-aversions, but still guaranteeing to find the minimax value (provided that the game-rules allow passing or zugzwang is not a motive). Using negligible working memory in itself, the method seems able to offer a large relative reduction in search space over standard alpha-beta comparable to the relative reduction in search space of alpha-beta over minimax, among other things depending upon how non-uniform the search tree is. Lambda-search is compared to other resembling approaches, such as null-move pruning and proof-number search, and it is explained how the concept and context of different orders of lambda-trees may ease and inspire the implementation of abstract game-specific knowledge. This is illustrated on open-space Go block tactics, distinguishing between different orders of ladders, and offering some possible grounding work regarding an abstract formalization of the concept of relevancy-zones (zones outside of which added stones of any colour cannot change the status of the given problem)." @default.
• W1821960358 created "2016-06-24" @default.
• W1821960358 creator A5042326326 @default.
• W1821960358 date "2001-01-01" @default.
• W1821960358 modified "2023-09-25" @default.
• W1821960358 title "Lambda-Search in Game Trees — with Application to Go" @default.
• W1821960358 cites W1990386132 @default.
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• W1821960358 doi "https://doi.org/10.1007/3-540-45579-5_2" @default.
• W1821960358 hasPublicationYear "2001" @default.
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