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Algorithms 2012, 5(4), 521-528; doi:10.3390/a5040521

Alpha-Beta Pruning and Althöfer’s Pathology-Free Negamax Algorithm

Department of Computer Science & Engineering, American University in Cairo, Cairo, Egypt
Received: 25 July 2012 / Revised: 6 October 2012 / Accepted: 25 October 2012 / Published: 5 November 2012
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The minimax algorithm, also called the negamax algorithm, remains today the most widely used search technique for two-player perfect-information games. However, minimaxing has been shown to be susceptible to game tree pathology, a paradoxical situation in which the accuracy of the search can decrease as the height of the tree increases. Althöfer’s alternative minimax algorithm has been proven to be invulnerable to pathology. However, it has not been clear whether alpha-beta pruning, a crucial component of practical game programs, could be applied in the context of Alhöfer’s algorithm. In this brief paper, we show how alpha-beta pruning can be adapted to Althöfer’s algorithm.
Keywords: game tree; search pathology; alpha-beta pruning game tree; search pathology; alpha-beta pruning
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Abdelbar, A.M. Alpha-Beta Pruning and Althöfer’s Pathology-Free Negamax Algorithm. Algorithms 2012, 5, 521-528.

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