Go grandmaster Shin Jin-seo has defeated the AI Go engine KataGo in a three-game series, winning 2-1 with a two-stone handicap. Shin's victory is significant as it demonstrates that humans can still compete against advanced AI in the game of Go. The series was played with a two-stone handicap, which is considered a significant advantage for the human player. Shin's win has been hailed as a historic victory for human intellect in the AI era.