[ by Charles Cameron — at the intersection of zero-sum and non-zero sum games ]
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And the hands-down winner is — opening today’s Washington Post to the op-ed page — President Hassan Rouhani of Iran, who says:

The world has changed. International politics is no longer a zero-sum game but a multi-dimensional arena where cooperation and competition often occur simultaneously. Gone is the age of blood feuds. World leaders are expected to lead in turning threats into opportunities.

I think he’s right, though I’ll leave the question of whether he means it TBD — but if he does, that’s a.. that’s a.. that’s a Major Game Changer — and verra interesting in any case:

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For your further edification, here’s what a genuine game-changer, in both literal and metaphoric sense of the phrase, looks like:
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The court is a tennis court, the game in play is revolutionary politics, the event is the Tennis Court Oath, where the members of the National Assembly gathered to swear “not to separate, and to reassemble wherever circumstances require, until the constitution of the kingdom is established” — the drawing is by Jacques-Louis David.