fix: reject non-power-of-2 score lists in minimax - #15042
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This was referenced Aug 21, 2026
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Describe your change
What does this implement/fix?
minimax() compared depth (int) against height (float from math.log), which never matches for non-power-of-2 list sizes and caused infinite recursion (RecursionError). Validate the power-of-2 constraint up front.
Additional comments?
None.
Fixes #14886