Lee Sedol
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Lee Sedol, also known as Lee Se-dol, is a South Korean former professional Go player who held 9 dan rank. Over his career he became one of the sport's most decorated competitors, ranking second in international titles as of February 2016. He is best known for a March 2016 five-game match against Google DeepMind's AlphaGo program, which he lost 4-1, an event widely cited as a milestone demonstrating deep learning's ability to master a game long considered computationally intractable. That match brought him broader recognition outside the Go community as a reference point in discussions of artificial intelligence progress.
Updated 6 August 2026
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