This was my first time reading about the history of discoveries like this, and I guess prior I thought these celebrated names had moved humanity forward by decades if not centuries by connecting the dots of the runes of the universe, but the reality is really very different.
One is an algorithm called ExIT published by Anthony et al, it showed excellent performance on a somewhat obscure board game called Hex. The authors using a typical academic lab setup to achieve this. It has a very impressive 300ish citations.
The other paper is AlphaGo, which has about 10k citations and a Netflix documentary. There are some algorithmic differences that probably make AlphaGo strictly better than ExIT but the big difference seems to mostly be that one group had like a thousand GPUs for a month.
I hope there are still those toiling away doing unpopular work, that can make a breakthrough....
By coordinating a simultaneous publication they can get extra publicity for the discovery, both get the first-mover advantage in citations (both papers get cited by everyone), and also get breathing room to be fully rigorous and write the best possible paper.
Same for people looking at patents from other countries.