In July 2007, Schaeffer announced a competition between the group's newest program, Polaris, and two human professionals, Phil Laak and Ali Eslami.
However, Aske Plaat, Jonathan Schaeffer, Wim Pijls and Arie de Bruin have shown that a sequence of null-window alpha-beta calls is equivalent to SSS* (i.e., it expands the same nodes in the same order) when alpha-beta is used with a transposition table, as is the case in all game-playing programs for chess, checkers, etc.
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