Watch DeepMind's program AlphaGo take on the legendary Lee Sedol (9-dan pro), the top Go player of the past decade, in a $1M 5-game challenge match in Seoul. This is the livestream for Match 4 to be played on: 13th March 13:00 KST (local), 04:00 GMT; note for US viewers this is the day before on: 12th March 20:00 PT, 23:00 ET.

In October 2015, AlphaGo became the first computer program ever to beat a professional Go player by winning 5-0 against the reigning 3-times European Champion Fan Hui (2-dan pro). That work was featured in a front cover article in the science journal Nature in January 2016.

Match commentary by Michael Redmond (9-dan pro) and Chris Garlock.