Discussion
What is expectimax used for?
Answer: C
Backgammon and card games contain chance nodes whose value is the expectation over the possible outcomes, so the tree alternates maximising, minimising and averaging layers. Multiplayer games need a vector of utilities, opponent modelling is a separate refinement and non-zero sum games change the backup rule differently. Adding an averaging layer to a minimax tree is a small structural change with large consequences for the search's cost.
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