Six Nations rugby: increased predictability (despite England upsets)

With the Six Nations rugby championship kicking off this weekend, we have two years of results to add to our understanding of the competition, following my 2017 article, “6 Nations Rugby - who’s the biggest overachiever?”. The six nations involved are England, France, Ireland, Italy, Scotland and Wales. We will look for recent changes in the ratings-based predictability of the teams in general and for recent changes in the distribution of upsets in particular, when ratings-based predictions proved to be wrong.