Very cool! And this paper is from 2019-20, and some of those I listed in my post are from 2018-19. I wonder how many of these turned out dead ends, and how far did the rest go by now. Papers for major conferences are often preprinted in advance, but sometimes DeepMind also comes out with something like AlphaGo or AlphaFold on their own schedule. Maybe some highly advanced Gato 2.0 is just around the corner?