You heard it here first, folks. According to DSkillz, Chaos was never even in the arena, make it an automatic win for Arthur
Jokes aside, I disagree just a bit with this reasoning because while it's true Chaos would be in no real danger, if Arthur has no chance of winning at all then he would consider it boring and would think Fate had determined Arthur has to lose, ans Chaos hates Fate more than anything. I think the most likely scenario is Chaos makes a game of it they is possible for Arthur to win but very hard, and Arthur, workhorse that he is, would overcome the challenges