A world retired because he decided cannot beat computers at the game of Go. His name is Lee Se-Dol from South Korea. Mr Lee is the only in the world to beat Google's AlphaGo computer . This is a special A.I. computer program created to play Go. Mr Lee, an 18- world champion, told that: "Even if I become the number one, there is an entity that cannot be defeated. With the of A.I. in Go games, I've realized I'm not at the top." Some people compare Go to .
Go originated in China 3,000 years . Today, it is played in 75 different countries. It is the board game in the world. The International Go Federation said over 46 million people knew how to play it. Mr Lee started playing at the of five and turned when he was 12. He played five against Google's AlphaGo and lost four of . He said his only was because of a "bug". The did not know what to do when Mr Lee made a "tricky" . Today's Go programs are much more powerful than the one that beat Mr Lee.