If I understand correctly, one reason there seem to be so many results for zero-sum games is that they have defined solutions, whereas in other situations, a mathematically valid strategy is to be a jerk ("blow up the island") and attempt to take the lion's share[1] of the surplus for oneself.
One of the early game theory papers considers two people with radios, parachuted onto a grid, who must rendezvous. It derives a theoretical strategy: broadcast one's location, then destroy one's radio, forcing the other player to do all the walking.
Bonus clip: https://www.youtube.com/watch?v=2yfXgu37iyI
@ 3:42 whew, still there: https://www.bbc.co.uk/sounds/play/live:bbc_radio_fourfm all OK, Boomers!
@ 3:55 unlike the House of Windsor during '14-'18, Kongo-Müller didn't bother to change his name: https://news.ycombinator.com/item?id=24423024 (esp. 53:40-56:15)
Those who prefer their skulls virtual are advised to avoid 30:10-33:30 and instead regard https://www.youtube.com/watch?v=hn1VxaMEjRU&t=57