A sequential game is one of imperfect information if a player does not know exactly what actions other players took up to that point.
Technically, there exists at least one information set with more than one node. If every information set contains exactly one node, the game is one of perfect information.
Intuitively, if it is my turn to move, I may not know what every other player has done up to now.
Therefore, I have to infer from their likely actions and from Bayes rule which actions likely led to my current decision.
updated: 15 August 2005
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