“In 1965, I was invited to a game theory workshop at Jerusalem which lasted for three weeks and had only 17 participants, but among them all the important researchers in game theory, with few exceptions. Game theory was still a small field. We had heated discussions about Harsanyi's new theory of games with incomplete information. This was the beginning of my long cooperation with John C. Harsanyi.”

"Reinhard Selten - Biographical," 1994

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Reinhard Selten6

German economist 1930–2016

Anatol Rapoport (1911–2007) Russian-born American mathematical psychologist

Source: 1960s, "The Use and Misuse of Game Theory," 1962, p. 110

“A proven theorem of game theory states that every game with complete information possesses a saddle point and therefore a solution.”

Richard Arnold Epstein (1927) American physicist

Source: The Theory of Gambling and Statistical Logic (Revised Edition) 1977, Chapter Two, Mathematical Preliminaries, p. 36

“Following von Neumann and Morgenstern [7, p. 30], we distinguish between games with complete information, to be sometimes briefly called C-games in this paper, and games with incomplete information, to be called I-games. The latter differ from the former in the fact that some or all of the players lack full information about the "rules" of the game, or equivalently about its normal form (or about its extensive form). For example, they may lack full information about other players' or even their own payoff functions, about the physical facilities and strategies available to other players or even to themselves, about the amount of information the other players have about various aspects of the game situation, etc.
In our own view it has been a major analytical deficiency of existing game theory that it has been almost completely restricted to C-games, in spite of the fact that in many real-life economic, political, military, and other social situations the participants often lack full information about some important aspects of the "game" they are playing.”

John Harsanyi (1920–2000) hungarian economist

Source: "Games with Incomplete Information Played by “Bayesian” Players," 1967, p. 163: Lead paragraph's

“At present game theory has, in my opinion, two important uses, neither of them related to games nor to conflict directly. First, game theory stimulates us to think about conflict in a novel way. Second, game theory leads to some genuine impasses, that is, to situations where its axiomatic base is shown to be insufficient for dealing even theoretically with certain types of conflict situations… Thus, the impact is made on our thinking process themselves, rather than on the actual content of our knowledge.”

Anatol Rapoport (1911–2007) Russian-born American mathematical psychologist

Source: 1960s, Fights, games, and debates, (1960), p. 242; As cited in: Han Dorussen. " Min beste fagbok: Anatol Rapoport: Fights, Games, and Debates http://www.sv.ntnu.no/iss/issavisa/98-1/bestebok.htm" at sv.ntnu.no, 1998