The article discusses the significance of the 2016 match between AlphaGo and professional Go player Lee Sedol. The game was considered intractable for computers due to its exponential number of variations, but AlphaGo's victory highlighted the rapid progress of AI in 2016. --- Why it matters: This matters because it showcases the power of deep learning in solving complex problems that were previously thought unsolvable by machines. Source: https://lilianweng.github.io/posts/2017-06-21-overview/