Go Grandmaster Shin Jin-seo Beats KataGo 2-1 With Two-Stone Handicap, First Human Series Win Over Top AI Since 2016
schwentker · x · 2026-09-03
World No.1 Go player Shin Jin-seo (9-dan) defeated top Go engine KataGo 2-1 in a three-game series under a two-stone handicap — the first official human series win over a state-of-the-art Go AI since AlphaGo beat Lee Sedol in 2016.
- In the deciding game, Shin played black and won by 11.5 points in 221 moves, holding 99% win probability from mid-game
- The two-stone handicap is considered the absolute boundary for human competition against modern Go AI
- Shin lost the opening game badly, then rebounded to win games two and three
- He said copying AI moves early in his career led to losses; building positions in his own style proved far more important
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