From the game setup/rules post:

Quote Originally Posted by Andres
V. THANK YOU
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- Again to Sigurd, for giving me his Midgard excel sheet and summary which was a great help for setting up the duel system
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Andres has also said once or twice that it is possible for a lesser to defeat a greater so that even the lowliest has a chance to win. There is a lot of discussion on this and I don't think it is productive but rather a distraction. Let's stay focused on things that matter! I don't know yet what all the things are that matter, but I seek them. My gut tells me the lengthy discussion on the mechanics of the battle system doesn't seem to be one of them.