Go Player Finally Defeats Google’s AlphaGo After 3 Losses

A legendary Go player on Sunday scored his first win over Google’s AlphaGo after losing to the artificial intelligence program three straight times in the ancient Chinese board game.

Lee Sedol, 33, of South Korea, said he finally found weaknesses in the software as the best-of-five series comes to a close, the Associated Press reports. He said that he discovered AlphaGo lacked the ability to deal with surprises and had more difficulty playing with a black stone.

“This one win is so valuable and I will not trade this for anything in the world,” said Lee, who has won 18 international championships.

Read More: Google’s AI Just Did Something Nobody Thought Possible

The 2-year-old program, developed by Google DeepMind, is the first computer system to defeat a top Go player. The final match is set to take place Tuesday.

[AP]

Subscribe to TIME

The Leadership Brief. Conversations with the most influential leaders in business and tech.

Please enter a valid email address.

* The request timed out and you did not successfully sign up. Please attempt to sign up again.

Sign Up Now

An unexpected error has occurred with your sign up. Please try again later.

Check the box if you do not wish to receive promotional offers via email from TIME.

You can unsubscribe at any time. By signing up you are agreeing to our Terms of Service and Privacy Policy. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Thank you!

For your security, we've sent a confirmation email to the address you entered. Click the link to confirm your subscription and begin receiving our newsletters. If you don't get the confirmation within 10 minutes, please check your spam folder.

Contact us at letters@time.com.