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<a accesskey="3" href="page.php?w=transposition_table&amp;p=2">3.Next</a>
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<p>A <b>transposition table</b> is a cache of previously seen positions, and associated evaluations, in a <a href="page.php?w=game_tree">game tree</a> generated by a computer game playing program. If a position reoccurs via a different sequence of moves, the value of the position is retrieved from the table, avoiding re-searching the game tree below that position. Transposition tables are primarily useful in <a href="page.php?w=perfect-information_game">perfect-information game</a>s (where the entire state of the game is known to all players at</p><p>
<a accesskey="3" href="page.php?w=transposition_table&amp;p=2">3.Next</a>
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