A lesser known game theoretic positive-sum equilibrium: the Stag Hunt.
Prisoner's Dilemma is the most famous one; a negative-sum equilibrium to potential collaboration.
The Stag Hunt is also a potential collaboration, but one with a positive-sum equilibrium.
In the Stag Hunt, you must collaborate to successfully hunt the stag.
If you defect, the best you can do alone is hunt rabbits.
Nuclear arms were originally a Prisoner's Dilemma that once they were created became a Stag Hunt.
At the end of WWII, the Nazis were working on the nuclear bomb, which meant the US had no choice but to do it, too.
But then after the bomb was created, the US and the USSR fell into a Stag Hunt frame.
We're currently in a Prisoner's Dilemma to create ASI.