Discussion
Why is minimax invariant to monotonic rescaling of the evaluation?
Answer: B
Every backup in minimax is a maximum or a minimum, which depends only on the ordering of the values, so any order preserving transformation gives the same move. Expectimax averages and so depends on the magnitudes. Signs, normalisation and terminal application are not the reason. Identifying an invariance is practically useful, because it says which aspects of a heuristic need tuning and which are free.
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