This may not be clear - a concrete example. In theory, a normal board game is 0-sum; there is 1 winner. In a broader context, that's untrue.https://twitter.com/MakerOfDecision/status/831907930450522112 …
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Replying to @MakerOfDecision
Side payments or bribes can change the payoff. If the game is ranked, the payoff to lower-ranked player may be larger than for his opponent.
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If one of the players decides to quit midway, that can change the zero-sum game into a negative sum game; everyone loses the invested time.
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