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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