2016.03.13 16:06
Human Go champion finally defeats AlphaGo after 3 straight losses Human Go champion Lee Sedol of South Korea finally defeated Google's Go-playing artificial intelligence (AI) AlphaGo on Sunday in the fourth match after three straight losses at the ancient Chinese board game. HUMAN Go champion Lee Sedol of South Korea finally defeated Google's Go-playing artificial intelligence (AI) AlphaGo on Sunday in the fourth match after three straight losses at the ancient Chinese board game. The final winner of the best-of-five match was already determined as the Go-playing program won the third consecutive game on Saturday, but Lee raised his score to 3-1 with the first victory over the supercomputer. The "match of the century" drew attention from around the world as it is seen as a representative match between humans and AI. Lee's victory defended the last remaining pride of human Go players as he achieved his goal of winning at least one game. AlphaGo, a computer program developed by Google's London-based AI subsidiary DeepMind, took the world by surprise as it beat European Go champion Fan Hui by 5-0 in October last year and defeated Lee at three straight games. AlphaGo boasts of a deep learning capability to learn for itself and discover new strategies by playing games against itself and adjusting neural networks based on a trial-and-error process known as reinforcement learning. Lee, 33, is regarded as one of the greatest Go players in the world as he won 18 world championships for 21 years of his professional career. He recorded a winning rate of about 70 percent with 47 victories in professional matches. One commentator said Lee's victory was a proof that AI hasn't surpassed humans completely, and another commentator said the fourth match revealed AlphaGo's weak points also shown in the previous game. The first victory of the human champion came as AlphaGo made many "questionable" moves in the middle of the match, which commentators said must be mistakes and algorithm errors. Such moves, which were also displayed in the previous matches, proved to be a strategy for a "bigger picture" in hindsight that had not been found in the human Go world, so it made the match unpredictable until near the end. Playing white, Lee adopted a strategy in an early phase to occupy the left and right sides of the board, while AlphaGo sought to win a broader area at the center. The 33-year-old attacked the center and made excellent moves, which drove AlphaGo into pressure and made many questionable moves. Keeping his dominating position, Lee eventually defeated AlphaGo as the AI resigned after exchanging 180 moves for nearly five hours in the fourth match that started from 1:00 p.m. local time at Four Seasons hotel in Seoul. The final match will be held in Seoul on Tuesday after a one-day break. Go, known as weiqi in China and Baduk in South Korea, originated from China thousands of years ago. It involves two players who take turns putting white and black stones on a grid of 19 lines by 19 lines. One can win an opponent when gaining more intersections on the grid. One can occupy stones of the opponent by surrounding the pieces. |
2016.03.13 16:16
2016.03.13 18:32
2016.03.14 06:15
“To be honest we are a bit stunned and speechless.
AlphaGo can compute tens of thousands of positions a second,
but it’s amazing that Lee Se-dol is able to compete with that and push AlphaGo to the limit.
We came here to challenge Lee Se-dol because we wanted to see what AlphaGo was capable of,
and his amazing genius and creative skills have done that,”
DeepMind founder Demis Hassabis told journalists after the AI’s victory.
Lee Se-dol said he didn’t think he stood a chance in the third game.
He is set to play two more games with AlphaGo, despite having already missed out
on the $1 million victory purse that had been on the table.
“I do apologize for not being able to satisfy people’s expectations,” Lee said.
“I have extensive experience in playing Go but there was never a case
where I was under this much pressure … and I was incapable of overcoming it,” he added.
(Note: These are comments after the third game.)
* * * * * * * * * * * * * *
I am glad the Korean beat the computer, at least 3:1 as of now.
indicating that computer is not yet ready to defeat human being completely.
I think Lee Sedol (李世石) got smarter after three defeats by learning the computer's way of playing.
Has he learned faster than the computer??
Let's wait for the Tuesday's final game.
My best wishes for the Korean GO player to win.
李世石... What a name for a Badduk player !!