Exact Score

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An Exact Score is a score returned from an alpha-beta search, if alpha, the max so far, was improved, while the min-player improved his score as well (score < beta ). The current node searched was an expected PV-Node, which was confirmed by the search in finding and collecting a principal variation.

=Always or Never=
 * Pure Minimax always returns exact scores.
 * A Null Window search never returns exact scores.

=See also=
 * Alpha-Beta
 * Integrated Bounds and Values
 * Lower Bound
 * Score
 * Transposition Table
 * Upper Bound

=Forum Posts=
 * Bounds... when is an exact score an EXACT score? by Ross Boyd, CCC, August 01, 2003
 * A few general questions... by Bill Henry, CCC, January 29, 2012 » Root, Aspiration Windows
 * Exact node values by CDaley11, OpenChess Forum, January 16, 2013

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