Games of Perfect Information
Games of perfect and imperfect information relate to conflict situations that are presented in an extensive (tree) form. If the players can in all situations uniquely specify in which node of the tree they make their decisions (they have entire information about all previous movies), it is a game of perfect information. For example, a game of chess represents a game of perfect information. Most card games belong to games of imperfect information.
Every game of perfect information has a saddle point, but a reverse statement is not true (a game can have a saddle point, but it is a game of imperfect information).