A world champion has retired because he has decided humans cannot beat (computer) at his game.
The grand champion is Lee Se-Dol from South Korea, was a world champion at the ancient, strategy board game Go. Some people compare Go to chess. Mr. Lee isonly person in the world to ever beat Google's AlphaCo which is a special AI computer program (create) by Google to play Go. Mr. Lee, an 18-time world champion, said, "With the first appearance of Al in Go games, I've realized that I'm not at the top even if I become the number one."
The game Go came in China around 3,000 years ago. Today, it is played (main) in China, Japan and South Korea. It is believed to be the (old) board game in the world. Mr. Lee started playing the age of five. He (turn) professional seven years later, when he was 12. He played five games against Google's AlphaCo and lost four of them. He said his one victory was because of a "bug" in the program. The bug did not know what (do) when Mr. Lee made a "tricky" move. Today's Go programs are much more (power) than the one that beat Mr. Lee.
