Google’s AI AlphaGo 'resigns' in fourth match
Update: After three losses, Go champion wins fourth round against artificial intelligence
Since winning the first three matches, Google's AlphaGo has finally been defeated by legendary Go grandmaster, Lee Se-dol in Seoul, South Korea.
Playing the Chinese board game, Go, Lee scored his first win against DeepMind's artificial intelligence, as the computer messaged "AlphaGo resigns". This prompted a reminder the program may not be perfect after all, despite three consecutive wins.
"I couldn't be happier today...this victory is priceless. I wouldn't trade it for the world," Mr. Lee said at a news conference after the game.
The fourth match, which lasted almost five hours on Sunday, saw Lee struggle in the early phase but eventually gained a lead towards the end, where Lee took battle to the centre of the board in the 78th turn. This move baffled AlphaGo and reacted by making a mistake in the 79th move, resulting in unusual moves thereafter.
DeepMind CEO Denis Hassabis tweeted: "Lee Sedol is playing brilliantly! #AlphaGo thought it was doing well, but got confused on move 87. We are in trouble now... Mistake was on move 79, but #AlphaGo only came to that realisation on around 87."
Hassabis added after: "Lee Sedol wins game 4!!! Congratulations! He was too good for us today and pressured #AlphaGo into a mistake that it couldn't recover from."
The final match will take place on Tuesday.
Related: Google AI defeats human playing Go