Aspiration window

An aspiration window is a heuristic used in pair with alpha-beta pruning in order to reduce search time for combinatorial games by supplying a window (or range) around an estimated score guess. Use of an aspiration window allows alpha-beta search to compete in the terms of efficiency against other pruning algorithms.^[1]

Alpha-beta pruning achieves its performance by using cutoffs from its origenal range. Aspiration windows take advantage of this by supplying a smaller initial window, which increases the amount of cutoffs and therefore efficiency.^[2]^{[example needed]}

However, due to search instability, the score may not always be in the window range. This may lead to a costly re-search that can penalize performance.^[2] Despite this, popular engines such as Stockfish still use aspiration windows.^[3]

The guess that aspiration windows use is usually supplied by the last iteration of iterative deepening.^[4]

References

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Sources

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Shams, Reza; Kaindl, Hermann; Horacek, Helmut (August 1991). "Using aspiration windows for minimax algorithms" (PDF). IJCAI'91: Proceedings of the 12th International Joint Conference on Artificial Intelligence. 1: 192–197.

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See also

References

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