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What is a game of imperfect information?

  • A.One in which players cannot see the whole state
  • B.One in which the outcome depends partly on chance
  • C.One in which the rules are not fully specified
  • D.One in which players move simultaneously rather than in turn

Answer: A

Card games hide the opponents' holdings, so a player must reason about a distribution over possible states rather than a single known position. Chance is a separate dimension, though many such games have both. Rule ambiguity is not a game theoretic notion, and simultaneous movement is a further variation. Partial observability transplanted into a game setting brings in belief states and, unlike the perfect information case, makes randomised strategies genuinely necessary.

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