Lee Sedol Glossary

South Korean Go champion whose 2016 match with AlphaGo became one of the canonical public moments in modern AI history.

Lee Sedol is a South Korean 9-dan Go professional and one of the strongest players of his generation. His 2016 match against DeepMind’s AlphaGo became a canonical moment in AI history because Go had long been treated as a game where human intuition still held a deep advantage over machines.

AlphaGo won the five-game match 4–1 in Seoul in March 2016. Lee’s single victory, Game 4, remains culturally important because it complicated a simple story of machine replacement. His move 78 was a surprising tactical intervention that AlphaGo had assigned a very low probability; it helped turn the game, although no single move explains an entire Go result.

For the Dictionary, Lee Sedol is a named marker for the moment AI stopped being merely impressive in benchmarks and became emotionally legible to the public as a challenge to human mastery.

See also

• Alan Turing
• Scaling Laws
• Capability Overhang

Sources

• Google DeepMind, AlphaGo: https://deepmind.google/research/alphago/
• British Go Association, Google DeepMind Challenge Match — Lee Sedol v AlphaGo: https://www.britgo.org/alphago-leesedol

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