“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

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

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John Harsanyi 12

hungarian economist 1920–2000

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“The paper develops a new theory for the analysis of games with incomplete information where the players are uncertain about some important parameters of the game situation, such as the payoff functions, the strategies available to various players, the information other players have about the game, etc. However, each player has a subjective probability distribution over the alternative possibilities.
In most of the paper it is assumed that these probability distributions entertained by the different players are mutually "consistent," in the sense that they can be regarded as conditional probability distributions derived from a certain "basic probability distribution" over the parameters unknown to the various players. But later the theory is extended also to cases where the different players' subjective probability distributions fail to satisfy this consistency assumption.”

John Harsanyi (1920–2000) hungarian economist

Source: "Games with Incomplete Information Played by “Bayesian” Players," 1967, p. 159 : Abstract

“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 (1930–2016) German economist

"Reinhard Selten - Biographical," 1994

“Analysis of the mathematical form and underlying principles of games was made by von Neumann " as early as 1928. In this early work von Neumann was not so much interested in executive-type problems as he was in the logical foundations of quantum mechanics. It was not until 1944, when von Neumann and Morgenstern published their now well known Theory of Games and Economic Behavior, that the mathematical treatment of games "took fire."”

C. West Churchman (1913–2004) American philosopher and systems scientist

Source: 1940s - 1950s, Introduction to Operations Research (1957), p. 519: Partly cited in: E. Roy Weintraub (1992) Toward a history of game theory. p. 235

“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

“The world is a game of information and paradox.”

Subhash Kak (1947) Indian computer scientist

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“Contract Bridge is likely the most challenging card game extant; it is certainly the the most obsessive for its ranks of zealous followers. The initial progenitor of all Bridge forms is the game of Triumph, which gained currency about A. D. 1500. In the mid seventeenth century, Triumph evolved into Whist, a partnership game for four players. The change from Whist to Bridge occurred about 1886with a publication in London of a small pamphlet, titled Biritch or Russian Whist.”

Richard Arnold Epstein (1927) American physicist

Source: The Theory of Gambling and Statistical Logic (Revised Edition) 1977, Chapter Eight, Contract Bridge, p. 252

“We have a word game in English called "Twenty questions." To play Twenty Questions, one player imagines some object, and the other players must guess what it is by asking questions that can be answered with a "yes" or a "no." I imagine every language has a similar game, and, for those of us who speak the language of science, the game is called The Scientific Method.”

K. Barry Sharpless (1941) American chemist

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“In the period 1965 - 69, the U. S. Arms Control and Disarmament Agency employed a group of about ten young game theorists as consultants. It was as a member of this group that I developed the simpler approach, already mentioned, to the analysis of I-games.
I realized that a major problem in arms control negotiations is the fact that each side is relatively well informed about its own position with respect to various variables relevant to arms control negotiations, such as its own policy objectives, its peaceful or bellicose attitudes toward the other side, its military strength, its own ability to introduce new military technologies, and so on - but may be rather poorly informed about the other side's position in terms of such variables.
I came to the conclusion that finding a suitable mathematical representation for this particular problem may very well be a crucial key to a better theory of arms control negotiations, and indeed to a better theory of all I-games.”

John Harsanyi (1920–2000) hungarian economist

Source: "Games with Incomplete Information," 1997, p. 138

“At times we forget that football is a team effort, a team game and not a solo show game. Sometimes we just don't respect the game. I love my game, but sometimes you need to please the people around you also, and pass the ball to them. At times during games we forget about team-mates in better positions while we try and force our way in, rather than pass to players in better positions around the box. That is something I'm thinking about more.”

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" Thierry Henry player profile http://www.timesonline.co.uk/article/0,,278-377977,00.html, Times Online

“The theory of games was first formalised by Von Neumann & Morgenstern (1953) in reference to human economic behaviour. Since that time, the theory has undergone extensive development… Sensibly enough, a central assumption of classical game theory is that the players will behave rationally, and according to some criterion of self-interest. Such an assumption would clearly be out of place in an evolutionary context. Instead, the criterion of rationality is replaced by that of population dynamics and stability, and the criterion of self-interest by Darwinian fitness.”

John Maynard Smith book Evolution and the Theory of Games

Source: Evolution and the Theory of Games (1973), p. 1-2.

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