A computer wins at Go

https://www.washingtonpost.com/news/innovations/wp/2016/01/27/google-just-mastered-a-game-thats-vexed-scientists-for-decades/?wpmm=1&wpisrc=nl_innov

I'm rarely impressed by the claims made in AI circles, (I consider the braying about wins in Chess and Jeopardy to immature and silly).  But this impresses me.