Explained Simply: How an AI program mastered the ancient game of Go

This is about AlphaGo, Google DeepMind's Go playing AI that shook the technology world in 2016 by defeating one of the best players in the world, Lee Sedol. Go is an ancient board game which has so many possible moves at each step that future positions are hard to predict -- and therefore it requires strong intuition and abstract thinking to play. Because of this reason, it was believed that only humans could be good at playing Go. Most researchers thought that it would still take decades to build an AI which could think like that. In fact, I'm releasing this essay today because this week (March 8–15) marks the two-year anniversary of the AlphaGo vs Sedol match!