I read an article a while back (maybe over a year ago?) in the Mishpacha English Magazine (I'm pretty sure, although it may have been in the Ami) that discussed a certain machlokes Tanaim about how to divide some disputed amount of money among different parties (that is all I remember of the case). There was a discussion if two people claim it, or three or more. Perhaps it was a discussion if someone stole something but doesn't know from who and there are several claimants it was them (but I'm not sure of that).
One of the opinions is very difficult to understand the theoretical basis behind, and the article quoted a Rishon as saying it is incomprehensible. The Halacha, of course, is paskened according to other opinions on how to do the division.
Then the article went on to say that that according to modern game theory this incomprehensible opinion was in fact comprehensible and consistent with this theory. I distinctly remember the specifics of the game theory not being discussed.
So which Machlokes Tanaim is this? What is the case, and the source? (The statement that one of the opinions is incomprehensible is probably enough to recognize it, but I have a feeling I'll recognize the case if I see it again).
Bonus points: What idea in Game theory helps explain the hard-to-understand opinion?