Discussion
What happens at a chance node in an expectimax tree?
Answer: B
A chance node takes the expectation of its children weighted by the probability of each outcome, so a dice roll or a card deal is modelled correctly. Selection would ignore the randomness, actual sampling belongs to Monte Carlo methods, and skipping would discard the structure. Adding a third kind of node with its own backup rule extends minimax to a whole class of games without disturbing the rest of the algorithm.
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