AlphaGo versus Lee Sedol

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AlphaGo versus Lee Sedol
4–1
Seoul, South Korea, 9–15 March 2016
Game one AlphaGo W+R
Game two AlphaGo B+R
Game three AlphaGo W+R
Game four Lee Sedol W+R
Game five AlphaGo W+R

AlphaGo versus Lee Sedol, also known as the Google DeepMind Challenge Match, was a five-game Go match between 18-time world champion Lee Sedol and AlphaGo, a computer Go program developed by Google DeepMind, played in Seoul, South Korea between 9 and 15 March 2016. AlphaGo won all but the fourth game;[1] all games were won by resignation.[2] The match has been compared with the historic chess match between Deep Blue and Garry Kasparov in 1997.

The winner of the match was slated to win $1 million. Since AlphaGo won, Google DeepMind stated that the prize will be donated to charities, including UNICEF, and Go organisations.[3] Lee received $170,000 ($150,000 for participating in the five games and an additional $20,000 for winning one game).[4]

After the match, The Korea Baduk Association awarded AlphaGo the highest Go grandmaster rank – an "honorary 9 dan". It was given in recognition of AlphaGo's "sincere efforts" to master Go.[5] This match was chosen by Science as one of the Breakthrough of the Year runners-up on 22 December 2016.[6]

Background[edit]

Difficult challenge in artificial intelligence[edit]

External video
Machine trains self to beat humans at world's hardest game, Retro Report, 2:51, Retro Report[7]

Go is a complex board game that requires intuition, creative and strategic thinking.[8][9] It has long been considered a difficult challenge in the field of artificial intelligence (AI) and is considerably more difficult[10] to solve than chess. Many in the field of artificial intelligence consider Go to require more elements that mimic human thought than chess.[11] Mathematician I. J. Good wrote in 1965:[12]

Go on a computer? – In order to programme a computer to play a reasonable game of Go, rather than merely a legal game – it is necessary to formalise the principles of good strategy, or to design a learning programme. The principles are more qualitative and mysterious than in chess, and depend more on judgment. So I think it will be even more difficult to programme a computer to play a reasonable game of Go than of chess.

Prior to 2015,[13] the best Go programs only managed to reach amateur dan level.[14] On the small 9×9 board, the computer fared better, and some programs managed to win a fraction of their 9×9 games against professional players. Prior to AlphaGo, some researchers had claimed that computers would never defeat top humans at Go.[15] Elon Musk, an early investor of Deepmind, said in 2016 that experts in the field thought AI was 10 years away from achieving a victory against a Go top professional player.[16]

The match AlphaGo versus Lee Sedol is comparable to the 1997 chess match Deep Blue versus Garry Kasparov. There IBM's Deep Blue computer's defeat of reigning champion Kasparov is seen as the symbolic point where computers became better than humans at chess.[17]

AlphaGo is most significantly different from previous AI efforts in that it applies neural networks, in which evaluation heuristics are not hard-coded by human beings, but instead to a large extent learned by the program itself, through tens of millions of past Go matches as well as its own matches with itself. Not even AlphaGo's developer team are able to point out how AlphaGo evaluates the game position and picks its next move. These networks guide a Monte Carlo tree search which explores many moves into the future.

Related research results are being applied to fields such as cognitive science, pattern recognition and machine learning.[18]

Match against Fan Hui[edit]

Fan Hui vs AlphaGo – Game 5

AlphaGo defeated European champion Fan Hui, a 2 dan professional, 5–0 in October 2015, the first time an AI had beaten a human professional player at the game on a full-sized board without a handicap.[19][20] Some commentators stressed the gulf between Fan and Lee, who is ranked 9 dan professional.[21] Computer programs Zen and Crazy Stone have previously defeated human players ranked 9 dan professional with handicaps of four or five stones.[22][23] Canadian AI specialist Jonathan Schaeffer, commenting after the win against Fan, compared AlphaGo with a "child prodigy" that lacked experience, and considered, "the real achievement will be when the program plays a player in the true top echelon." He then believed that Lee would win the match in March 2016.[20] Hajin Lee, a professional Go player and the International Go Federation's secretary-general, commented that she was "very excited" at the prospect of an AI challenging Lee, and thought the two players had an equal chance of winning.[20]

In the aftermath of his match against AlphaGo, Fan Hui noted that the game had taught him to be a better player, and to see things he had not previously seen. By March 2016, Wired reported that his ranking had risen from around 633 to the 300s.[24]

Preparation[edit]

Go experts found errors in AlphaGo's play against Fan, in particular relating to a lack of awareness of the entire board, but before the opening game against Lee, it was unknown how much the program had improved its game since its October match.[21][25] AlphaGo was not tailored to play against Lee Sedol, which would anyway be hard to do because training AlphaGo requires tens of millions of games, and a few hundred or thousand games from a particular player would not be enough to alter AlphaGo's play. Instead, AlphaGo's training was started with games of strong amateur players from internet Go servers, after which AlphaGo trained by playing against itself; there were no Lee Sedol games in AlphaGo's training data.[26][27]

Players[edit]

AlphaGo[edit]

AlphaGo logo

AlphaGo is a computer program developed by Google DeepMind to play the board game Go. AlphaGo's algorithm uses a combination of machine learning and tree search techniques, combined with extensive training, both from human and computer play. The system's neural networks were initially bootstrapped from human game-play expertise. AlphaGo was initially trained to mimic human play by attempting to match the moves of expert players from recorded historical games, using a KGS Go Server database of around 30 million moves from 160,000 games by KGS 6 to 9 dan human players.[13][28] Once it had reached a certain degree of proficiency, it was trained further by being set to play large numbers of games against other instances of itself, using reinforcement learning to improve its play.[29] The system does not use a "database" of moves to play. As one of the creators of AlphaGo explained:[30]

Although we have programmed this machine to play, we have no idea what moves it will come up with. Its moves are an emergent phenomenon from the training. We just create the data sets and the training algorithms. But the moves it then comes up with are out of our hands—and much better than we, as Go players, could come up with.

The version of AlphaGo that played against Lee used a similar amount of computing power as in the match against Fan Hui,[31] where it used 1,202 CPUs and 176 GPUs.[13] The Economist reported that it used 1,920 CPUs and 280 GPUs.[32] Google has also stated that its proprietary tensor processing units were used in the match against Lee Sedol.[33]

Lee Sedol[edit]

Lee Sedol in 2012

Lee Sedol is a professional Go player of 9 dan rank[34] and is one of the strongest players in the history of Go. He started his career in 1996 (promoted to professional dan rank at the age of 12), winning 18 world championships since then.[35] He is a "national hero" in his native South Korea, known for his unconventional and creative play.[36] Lee Sedol initially predicted he would defeat AlphaGo in a "landslide".[36] Some weeks before the match he won the Korean Myungin title, a major championship.[37]

Games[edit]

The match was a five-game match with one million US dollars as the grand prize,[3] using Chinese rules with a 7.5-point komi.[4] For each game there was a two-hour set time limit for each player followed by three 60-second byo-yomi overtime periods.[4] Each game started at 13:00 KST (04:00 GMT).[38]

The match was played at the Four Seasons Hotel in Seoul, South Korea in March 2016 and was video-streamed live with commentary by Michael Redmond (9-dan professional) and Chris Garlock.[39][40][41] Aja Huang, a DeepMind team member and amateur 6-dan Go player, placed stones on the Go board for AlphaGo, which ran through the Google Cloud Platform with its server located in the United States.[42]

Summary[edit]

Game Date Black White Result Moves
1 9 March 2016 Lee Sedol AlphaGo Lee Sedol resigned 186 Game 1
2 10 March 2016 AlphaGo Lee Sedol Lee Sedol resigned 211 Game 2
3 12 March 2016 Lee Sedol AlphaGo Lee Sedol resigned 176 Game 3
4 13 March 2016 AlphaGo Lee Sedol AlphaGo resigned 180 Game 4
5 15 March 2016 Lee Sedol[note 1] AlphaGo Lee Sedol resigned 280 Game 5
Result:
AlphaGo 4 – 1 Lee Sedol
^ note 1: For Game Five, under the official rules, it was intended that the colour assignments would be done at random.[43] However, during the press conference after the fourth match, Lee requested "... since I won with white, I really do hope that in the fifth match I could win with black because winning with black is much more valuable."[44] Hassabis agreed to his proposition.

Game 1[edit]

AlphaGo (white) won the first game. Lee appeared to be in control throughout much of the match, but AlphaGo gained the advantage in the final 20 minutes and Lee resigned.[45] Lee stated afterwards that he had made a critical error at the beginning of the match; he said that the computer's strategy in the early part of the game was "excellent" and that the AI had made one unusual move that no human Go player would have made.[45] David Ormerod, commenting on the game at Go Game Guru, described Lee's seventh stone as "a strange move to test AlphaGo's strength in the opening", characterising the move as a mistake and AlphaGo's response as "accurate and efficient". He described AlphaGo's position as favourable in the first part of the game, considering that Lee started to come back with move 81, before making "questionable" moves at 119 and 123, followed by a "losing" move at 129.[46] Professional Go player Cho Hanseung commented that AlphaGo's game had greatly improved from when it beat Fan Hui in October 2015.[46] Michael Redmond described the computer's game as being more aggressive than against Fan.[47]

According to 9-dan Go grandmaster Kim Seong-ryong, Lee seemed stunned by AlphaGo's strong play on the 102nd stone.[48] After watching AlphaGo make the game's 102nd move, Lee mulled over his options for more than 10 minutes.[48]

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Go l.svg Go board diagram image.svg Go board diagram image.svg Go 93.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 62.svg Go 58.svg Go 59.svg Go 50.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go b7.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go 92.svg Go 83.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 77.svg Go board diagram image.svg Go board diagram image.svg Go 51.svg Go 56.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
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Go l.svg Go board diagram image.svg Go 88.svg Go 90.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 71.svg Go 72.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 78.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go w4.svg Go 91.svg Go 84.svg Go 85.svg Go board diagram image.svg Go board diagram image.svg Go -.svg Go board diagram image.svg Go 73.svg Go 74.svg Go board diagram image.svg Go board diagram image.svg Go -.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 79.svg Go 86.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 75.svg Go 76.svg Go board diagram image.svg Go board diagram image.svg Go b3.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 87.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 95.svg Go 94.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
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First 99 moves
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Go l.svg Go board diagram image.svg Go 16.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go b.svg Go board diagram image.svg Go b.svg Go 79.svg Go w.svg Go 78.svg Go w.svg Go w.svg Go b.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go board diagram image.svg Go w.svg Go b.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go 01.svg Go w.svg Go 36.svg Go b.svg Go 70.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go b.svg Go w.svg Go b.svg Go board diagram image.svg Go b.svg Go w.svg Go board diagram image.svg Go 14.svg Go b.svg Go r.svg
Go l.svg Go board diagram image.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go b.svg Go b.svg Go w.svg Go w.svg Go b.svg Go b.svg Go board diagram image.svg Go w.svg Go 13.svg Go 10.svg Go 12.svg Go 69.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go 52.svg Go board diagram image.svg Go w.svg Go b.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go b.svg Go board diagram image.svg Go 21.svg Go r.svg
Go 72.svg Go 74.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 86.svg Go 85.svg Go 51.svg Go w.svg Go w.svg Go b.svg Go w.svg Go 00.svg Go board diagram image.svg Go w.svg Go b.svg Go 15.svg Go 08.svg Go r.svg
Go 71.svg Go 66.svg Go 50.svg Go board diagram image.svg Go board diagram image.svg Go 64.svg Go 75.svg Go w.svg Go b.svg Go board diagram image.svg Go b.svg Go b.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go 11.svg Go r.svg
Go 73.svg Go 65.svg Go 82.svg Go 54.svg Go board diagram image.svg Go 76.svg Go b.svg Go b.svg Go b.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go 03.svg Go 02.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 63.svg Go 77.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go 07.svg Go 06.svg Go 04.svg Go board diagram image.svg Go r.svg
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Go 62.svg Go 58.svg Go 61.svg Go w.svg Go b.svg Go w.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go -.svg Go board diagram image.svg Go b.svg Go w.svg Go board diagram image.svg Go 31.svg Go 30.svg Go 28.svg Go board diagram image.svg Go r.svg
Go 84.svg Go 55.svg Go 56.svg Go 59.svg Go board diagram image.svg Go b.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 25.svg Go b.svg Go w.svg Go board diagram image.svg Go 35.svg Go b.svg Go 32.svg Go board diagram image.svg Go r.svg
Go l.svg Go 60.svg Go 57.svg Go 53.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 24.svg Go b.svg Go w.svg Go 22.svg Go board diagram image.svg Go 33.svg Go 34.svg Go 37.svg Go 38.svg Go r.svg
Go dl.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go 47.svg Go d.svg Go d.svg Go d.svg Go d.svg Go 39.svg Go d.svg Go 40.svg Go dr.svg
Moves 100–186

Game 2[edit]

AlphaGo (black) won the second game. Lee stated afterwards that "AlphaGo played a nearly perfect game",[49] "from very beginning of the game I did not feel like there was a point that I was leading".[50] One of the creators of AlphaGo, Demis Hassabis, said that the system was confident of victory from the midway point of the game, even though the professional commentators could not tell which player was ahead.[50]

Michael Redmond (9p) noted that AlphaGo's 19th stone (move 37) was "creative" and "unique".[30] Lee took an unusually long time to respond to the move.[30] An Younggil (8p) called AlphaGo's move 37 "a rare and intriguing shoulder hit" but said Lee's counter was "exquisite". He stated that control passed between the players several times before the endgame, and especially praised AlphaGo's moves 151, 157, and 159, calling them "brilliant".[51]

AlphaGo showed anomalies and moves from a broader perspective which professional Go players described as looking like mistakes at the first sight but an intentional strategy in hindsight.[52] As one of the creators of the system explained, AlphaGo does not attempt to maximize its points or its margin of victory, but tries to maximize its probability of winning.[30][53] If AlphaGo must choose between a scenario where it will win by 20 points with 80 percent probability and another where it will win by 1 and a half points with 99 percent probability, it will choose the latter, even if it must give up points to achieve it.[30] In particular, move 167 by AlphaGo seemed to give Lee a fighting chance and was declared to look like an obvious mistake by commentators. An Younggil stated "So when AlphaGo plays a slack looking move, we may regard it as a mistake, but perhaps it should more accurately be viewed as a declaration of victory?"[54]

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Go l.svg Go 22.svg Go 20.svg Go 23.svg Go 48.svg Go 45.svg Go 56.svg Go 47.svg Go board diagram image.svg Go board diagram image.svg Go 78.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 15.svg Go 16.svg Go board diagram image.svg Go r.svg
Go l.svg Go 21.svg Go 17.svg Go w2.svg Go 26.svg Go board diagram image.svg Go 41.svg Go 46.svg Go board diagram image.svg Go 29.svg Go 79.svg Go board diagram image.svg Go 11.svg Go board diagram image.svg Go b5.svg Go -.svg Go w4.svg Go board diagram image.svg Go r.svg
Go l.svg Go 19.svg Go 18.svg Go 25.svg Go board diagram image.svg Go 10.svg Go 42.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go b7.svg Go w6.svg Go w8.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go 27.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go dl.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go dr.svg
First 99 moves
Go ul.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go 97.svg Go 96.svg Go 66.svg Go 98.svg Go 44.svg Go u.svg Go u.svg Go ur.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 71.svg Go 45.svg Go 42.svg Go 43.svg Go 38.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go b.svg Go w.svg Go b.svg Go b.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go 73.svg Go 70.svg Go 74.svg Go 33.svg Go 30.svg Go 32.svg Go r.svg
Go 95.svg Go 37.svg Go b.svg Go 99.svg Go b.svg Go w.svg Go b.svg Go b.svg Go w.svg Go -.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go 72.svg Go b.svg Go 31.svg Go b.svg Go 34.svg
Go 93.svg Go 92.svg Go 36.svg Go 46.svg Go 47.svg Go w.svg Go w.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 53.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go w.svg Go r.svg
Go 94.svg Go board diagram image.svg Go w.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 09.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 52.svg Go 51.svg Go board diagram image.svg Go w.svg Go w.svg Go board diagram image.svg Go w.svg
Go l.svg Go board diagram image.svg Go w.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go 35.svg Go 29.svg Go board diagram image.svg Go 40.svg Go 63.svg Go 59.svg Go 61.svg Go 58.svg Go 62.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go r.svg
Go l.svg Go w.svg Go b.svg Go b.svg Go b.svg Go 55.svg Go w.svg Go 49.svg Go board diagram image.svg Go 65.svg Go 28.svg Go 60.svg Go w.svg Go 57.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go w.svg Go 17.svg Go w.svg Go board diagram image.svg Go b.svg Go 00.svg Go 39.svg Go 01.svg Go 69.svg Go 67.svg Go 15.svg Go 68.svg Go 64.svg Go w.svg Go w.svg Go w.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go 18.svg Go w.svg Go 50.svg Go board diagram image.svg Go 48.svg Go 41.svg Go 06.svg Go 08.svg Go 16.svg Go 12.svg Go 19.svg Go b.svg Go b.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go b.svg Go board diagram image.svg Go w.svg Go 02.svg Go 03.svg Go board diagram image.svg Go board diagram image.svg Go 13.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 54.svg Go r.svg
Go l.svg Go board diagram image.svg Go w.svg Go b.svg Go 56.svg Go b.svg Go board diagram image.svg Go b.svg Go 04.svg Go 07.svg Go 11.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 83.svg Go 84.svg Go r.svg
Go l.svg Go 88.svg Go w.svg Go w.svg Go b.svg Go b.svg Go board diagram image.svg Go b.svg Go 05.svg Go board diagram image.svg Go 10.svg Go 27.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go 85.svg Go 86.svg Go r.svg
Go l.svg Go w.svg Go b.svg Go b.svg Go b.svg Go w.svg Go w.svg Go w.svg Go w.svg Go 80.svg Go 90.svg Go 89.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go board diagram image.svg Go r.svg
Go 87.svg Go w.svg Go w.svg Go b.svg Go w.svg Go b.svg Go w.svg Go b.svg Go 77.svg Go 79.svg Go w.svg Go 14.svg Go 91.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go w.svg Go board diagram image.svg Go r.svg
Go l.svg Go b.svg Go b.svg Go w.svg Go w.svg Go board diagram image.svg Go b.svg Go w.svg Go 78.svg Go b.svg Go b.svg Go 23.svg Go b.svg Go 25.svg Go b.svg Go -.svg Go w.svg Go board diagram image.svg Go r.svg
Go l.svg Go b.svg Go w.svg Go b.svg Go board diagram image.svg Go w.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 22.svg Go 24.svg Go b.svg Go w.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 82.svg Go 81.svg Go board diagram image.svg Go 75.svg Go 26.svg Go 21.svg Go 20.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go dl.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go 76.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go dr.svg
Moves 100–199
Go ul.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go b.svg Go w.svg Go w.svg Go w.svg Go w.svg Go u.svg Go u.svg Go ur.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 01.svg Go b.svg Go b.svg Go w.svg Go b.svg Go w.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go b.svg Go w.svg Go b.svg Go b.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go w.svg Go w.svg Go b.svg Go w.svg Go w.svg Go r.svg
Go b.svg Go b.svg Go b.svg Go b.svg Go b.svg Go w.svg Go b.svg Go b.svg Go w.svg Go -.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go w.svg Go b.svg Go b.svg Go b.svg Go w.svg
Go b.svg Go w.svg Go w.svg Go w.svg Go b.svg Go w.svg Go w.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go w.svg Go r.svg
Go w.svg Go board diagram image.svg Go w.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go b.svg Go board diagram image.svg Go w.svg Go w.svg Go board diagram image.svg Go w.svg
Go l.svg Go 00.svg Go w.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go b.svg Go board diagram image.svg Go w.svg Go b.svg Go b.svg Go b.svg Go w.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go r.svg
Go l.svg Go w.svg Go b.svg Go b.svg Go b.svg Go b.svg Go w.svg Go b.svg Go board diagram image.svg Go b.svg Go w.svg Go w.svg Go w.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go w.svg Go b.svg Go w.svg Go board diagram image.svg Go b.svg Go w.svg Go b.svg Go b.svg Go b.svg Go b.svg Go b.svg Go w.svg Go w.svg Go w.svg Go w.svg Go w.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go w.svg Go w.svg Go w.svg Go board diagram image.svg Go w.svg Go b.svg Go w.svg Go w.svg Go w.svg Go w.svg Go b.svg Go b.svg Go b.svg Go b.svg Go 09.svg Go 10.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go b.svg Go board diagram image.svg Go w.svg Go w.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go r.svg
Go l.svg Go board diagram image.svg Go w.svg Go board diagram image.svg Go w.svg Go b.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go b.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go w.svg Go r.svg
Go l.svg Go w.svg Go w.svg Go w.svg Go b.svg Go b.svg Go board diagram image.svg Go b.svg Go b.svg Go board diagram image.svg Go w.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go b.svg Go w.svg Go r.svg
Go l.svg Go w.svg Go b.svg Go b.svg Go b.svg Go w.svg Go w.svg Go w.svg Go w.svg Go w.svg Go w.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go 03.svg Go 02.svg Go w.svg Go board diagram image.svg Go r.svg
Go b.svg Go w.svg Go w.svg Go b.svg Go w.svg Go b.svg Go w.svg Go b.svg Go b.svg Go b.svg Go w.svg Go w.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go w.svg Go board diagram image.svg Go r.svg
Go l.svg Go b.svg Go b.svg Go w.svg Go w.svg Go 06.svg Go b.svg Go w.svg Go w.svg Go b.svg Go b.svg Go b.svg Go b.svg Go b.svg Go b.svg Go -.svg Go w.svg Go board diagram image.svg Go r.svg
Go l.svg Go b.svg Go w.svg Go b.svg Go board diagram image.svg Go w.svg Go w.svg Go 08.svg Go 07.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go w.svg Go b.svg Go w.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go 05.svg Go b.svg Go 04.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go b.svg Go board diagram image.svg Go b.svg Go w.svg Go board diagram image.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go dl.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go 11.svg Go d.svg Go w.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go dr.svg
Moves 200–211

Game 3[edit]

AlphaGo (white) won the third game.[55]

After the second game, there had still been strong doubts among players whether AlphaGo was truly a strong player in the sense that a human might be. The third game was described as removing that doubt; with analysts commenting that:

AlphaGo won so convincingly as to remove all doubt about its strength from the minds of experienced players. In fact, it played so well that it was almost scary ... In forcing AlphaGo to withstand a very severe, one-sided attack, Lee revealed its hitherto undetected power ... Lee wasn’t gaining enough profit from his attack ... One of the greatest virtuosos of the middle game had just been upstaged in black and white clarity.[54]

According to An Younggil (8p) and David Ormerod, the game showed that "AlphaGo is simply stronger than any known human Go player."[54] AlphaGo was seen to capably navigate tricky situations known as ko that did not come up in the previous two matches.[56] An and Ormerod consider move 148 to be particularly notable: in the middle of a complex ko fight, AlphaGo displayed sufficient "confidence" that it was winning the fight to play a large move elsewhere.[54]

Lee, playing black, opened with a High Chinese formation and generated a large area of black influence, which AlphaGo invaded at move 12. This required the program to defend a weak group, which it did successfully.[54] An Younggil described Lee's move 31 as possibly the "losing move"[54] and Andy Jackson of the American Go Association considered that the outcome had already been decided by move 35.[53] AlphaGo had gained control of the game by move 48, and forced Lee onto the defensive. Lee counterattacked at moves 77/79, but AlphaGo's response was effective and its move 90 succeeded in simplifying the position. It then gained a large area of control at the bottom of the board, strengthening its position with moves from 102 to 112 described by An as "sophisticated".[54] Lee attacked again at moves 115 and 125, but AlphaGo's responses were again effective. Lee eventually attempted a complex ko from move 131, without forcing an error from the program, and he resigned at move 176.[54]

Go ul.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go ur.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go 13.svg Go 19.svg Go 22.svg Go board diagram image.svg Go 90.svg Go 27.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go b9.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go 23.svg Go b3.svg Go -.svg Go 12.svg Go 20.svg Go board diagram image.svg Go 26.svg Go b7.svg Go -.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go b1.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go 38.svg Go 18.svg Go 16.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 24.svg Go 25.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 99.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go 17.svg Go 15.svg Go 21.svg Go board diagram image.svg Go board diagram image.svg Go 29.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go w8.svg Go board diagram image.svg Go r.svg
Go l.svg Go 36.svg Go board diagram image.svg Go 33.svg Go 14.svg Go 50.svg Go 30.svg Go 28.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go 37.svg Go 45.svg Go 41.svg Go 51.svg Go 47.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 31.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go 39.svg Go 32.svg Go 34.svg Go 35.svg Go board diagram image.svg Go 46.svg Go 66.svg Go 56.svg Go 68.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 88.svg Go board diagram image.svg Go r.svg
Go 63.svg Go 62.svg Go 40.svg Go 11.svg Go 43.svg Go board diagram image.svg Go 67.svg Go 65.svg Go board diagram image.svg Go -.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go -.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go 61.svg Go 44.svg Go 42.svg Go 53.svg Go board diagram image.svg Go 55.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 87.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 54.svg Go 60.svg Go board diagram image.svg Go board diagram image.svg Go 69.svg Go board diagram image.svg Go board diagram image.svg Go 89.svg Go board diagram image.svg Go board diagram image.svg Go 83.svg Go 78.svg Go 82.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go 57.svg Go 48.svg Go board diagram image.svg Go 52.svg Go board diagram image.svg Go 64.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 80.svg Go 77.svg Go 10.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go b5.svg Go 49.svg Go 59.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 70.svg Go board diagram image.svg Go 98.svg Go board diagram image.svg Go board diagram image.svg Go 84.svg Go 81.svg Go 79.svg Go 85.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 58.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 86.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go board diagram image.svg Go 71.svg Go w4.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go -.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go w2.svg Go 92.svg Go 93.svg Go r.svg
Go l.svg Go 75.svg Go 72.svg Go 73.svg Go 76.svg Go w6.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 94.svg Go 91.svg Go 95.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go 74.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 96.svg Go 97.svg Go r.svg
Go dl.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go d.svg Go dr.svg
First 99 moves
Go ul.svg Go 11.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go u.svg Go ur.svg
Go l.svg Go 04.svg Go 07.svg Go board diagram image.svg Go 10.svg Go board diagram image.svg Go 12.svg Go board diagram image.svg Go 48.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go 08.svg Go board diagram image.svg Go b.svg Go b.svg Go w.svg Go board diagram image.svg Go w.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go 09.svg Go b.svg Go b.svg Go 05.svg Go w.svg Go w.svg Go board diagram image.svg Go w.svg Go b.svg Go -.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go 03.svg Go 01.svg Go r.svg
Go l.svg Go w.svg Go w.svg Go w.svg Go 06.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 02.svg Go b.svg Go 00.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go b.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 24.svg Go w.svg Go board diagram image.svg Go r.svg
Go l.svg Go w.svg Go board diagram image.svg Go b.svg Go w.svg Go w.svg Go w.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go r.svg
Go l.svg Go b.svg Go b.svg Go b.svg Go b.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 68.svg Go 62.svg Go 61.svg Go board diagram image.svg Go r.svg
Go l.svg Go b.svg Go w.svg Go w.svg Go b.svg Go board diagram image.svg Go w.svg Go w.svg Go w.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 67.svg Go w.svg Go board diagram image.svg Go r.svg
Go b.svg Go w.svg Go w.svg Go b.svg Go b.svg Go board diagram image.svg Go b.svg Go b.svg Go board diagram image.svg Go -.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go 17.svg Go 18.svg Go board diagram image.svg Go r.svg
Go l.svg Go b.svg Go w.svg Go w.svg Go b.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go 14.svg Go 13.svg Go 20.svg Go r.svg
Go l.svg Go board diagram image.svg Go board diagram image.svg Go board diagram image.svg Go w.svg Go w.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go board diagram image.svg Go b.svg Go board diagram image.svg Go board diagram image.svg