What happened
Researchers found that planning algorithms borrowed from board games use the wrong mathematical assumptions for certain types of problems — specifically, they assume rewards are bounded when they're actually unbounded. They developed a new algorithm based on extreme value theory that better handles these open-ended cost estimates and proved it works mathematically.
Why it matters
This is a specialist paper that improves how computers solve planning problems, but only within research settings — there's no evidence this algorithm is being used to solve real-world planning at scale or that it changes what's economically or operationally feasible in any deployed system.