Lee Sedol

Uncommon card · No. 91265

Lee Sedol (Korean: 이세돌; born 2 March 1983), or Lee Se-dol, is a South Korean former professional Go player of 9 dan rank. As of February 2016, he ranked second in international titles (18), behind only Lee Chang-ho (21). His nickname is "The Strong Stone" ("Ssen-dol"). In March 2016, he played a series of matches against the program AlphaGo that ended in Lee losing 1–4. Lee announced his retirement from professional play in November 2019, saying he could never be the top overall player of Go due to the increasing dominance of artificial intelligence (AI), which he called "an entity that cannot be defeated". In a 2024 interview, he said "losing to AI, in a sense, meant my entire world was collapsing. ... I could no longer enjoy the game. So I retired."

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