Discussion
What is aspiration search?
Answer: A
Guessing that the value will be close to the previous iteration's and searching with a narrow alpha beta window prunes far more, at the risk of the value falling outside and requiring a re-search. Usually the guess is right and the saving is substantial. Move restriction, targets and progressive widening are different techniques. A gamble that usually pays and whose failure costs only a repeat is a favourable bet, provided the failure is detected rather than silently accepted.
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