It gives me huge pleasure to announce that the winner of the Big Internet Math-Off 2019, and consequently the World’s Most Interesting Mathematician (2019, of the 16 people I asked, who were available in July and agreed to take part), is:

**Sophie Carr!**

The final was incredibly closely fought, with the lead changing several times over the course of the day. In the end, Sophie’s pitch about Bayes’ theorem and pregnancy tests just pipped Sam’s pitch about grids, with 53% of the votes cast.