Whatever its veracity, that result/writeup/claim is at least a couple
years old according to Wikipedia history.
https://fr.wikipedia.org/w/index.php?title=Hex&type=revision&diff=95162143&oldid=89914160
https://en.wikipedia.org/w/index.php?title=Hex_%28board_game%29&type=revision&diff=566436428&ol
I can only speculate, but I see two advantages to using MSE:
* MSE accomodates games that have more than just win/loss. One of
AlphaGo Zero's goals (I'm extrapolating from the paper) was to develop
a system that was easy to apply to domains other than go.
* It can be used with TD-lambda-lik
