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In game theory and economic theory, zero-sum describes a situation in which a participant's gain or loss is exactly balanced by the losses or gains of the other participant(s). It is so named because when the total gains of the participants are added up, and the total losses are subtracted, they will sum to zero. The strategy game Go is an example of a zero-sum game, it is a strategic board game for two players. To differentiate it from the common English verb go, it is written with a [[capital G]].