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What is the effect of imperfect information on the size of the problem?

  • A.The game tree becomes finite where it was previously infinite
  • B.The number of terminal positions is reduced considerably
  • C.Reasoning must be over sets of possible states rather than states
  • D.The branching factor of the game tree becomes much smaller

Answer: C

A player who cannot see the opponent's cards must reason about every hand consistent with the play so far, so the effective state is a distribution and the problem grows enormously. Sampling the possible states and solving each is a common approximation. Branching, finiteness and terminal counts are unaffected or worsened. Lifting a problem from states to distributions over states is the same move partial observability forces in ordinary search, and it costs the same exponential.

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