Debate: A formal contest of argumentation in which two opposing teams defend and attack a given proposition.
As I surmised earlier, this has become a debate rather than a discussion. (Some say a debate is what happens when a tango goes bad.) I've never seen a debate where one side conceded any major points, or where concession was other than a strategy for winning over the judges.
Certainly the participants cannot be relied on to judge each other. And we did not agree in advance to accept any judgements we didn't otherwise agree with.
But I must nevertheless end my presentation with the following summation: There is no conceivable way that the convoluted arguments of my opponent could have been fashioned in advance except by some chaotic roll of the dice, or even by a roomful of monkeys with typewriters. If that doesn't demonstrate free will exists, and omniscience only in myth, I'm a monkey's uncle. (But I could be a monkey's cousin, of course.)