Perfect information refers to the situation in which an agent
has all the relevant information with which to make a decision. It has
implications for several fields. In game theory, perfect information describes
the situation when a player has available the same information to determine all
of the possible games as would be available at the end of the game. In game
theory, a game is described as a game of perfect information if perfect
information is available for all moves. Chess is an example of a game with
perfect information as each player can see all of the pieces on the board at
all times. Other examples of perfect games include tic tac toe, irensei, and
go. Games with perfect information represent a small subset of games. Card
games where each player's cards are hidden from other players are examples of
games of imperfect information.
