For each year, I have calculated the median for the number of crosscuts, over all games for that year.
For each year, I have calculated the median for the move number on which the first crosscut occurred, over all games for that year.
I wrote a program that takes thousands of pro-level games, extracts the first twenty moves and assembles them in a single tree. Here I have chosen games from 2016 – the year that AlphaGo made its impact – to 2019 so we can study what kind of openings are played in the AI age.
This visualization shows the number of Go tournaments in European countries over the years.