1. Decision theory: Situation of conflict (competition) in which the payoffs received by participants from their actions, choices, and decisions are at least partly determined by the actions, choices, and decisions of the other contestants. This concept of games includes contests of strategy (such as baseball, basketball, card-games, checkers, chess, cricket, hockey, soccer, tennis), but not those based on pure chance (such as lotteries). In these situations, while one may (with practice) become more adept at predicting the opponents' strategies and tactics, one's moves are still constantly conditioned by the other participants' moves.
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