AlphaGo versus Ke Jie

AlphaGo versus Ke Jie was a three-game Go match between the computer Go program AlphaGo Master and current world No. 1 ranking player Ke Jie, being part of the Future of Go Summit in Wuzhen, China, played on 23, 25, and 27 May 2017.[1]

Match Date Black White Result Moves
1 23 May 2017Ke JieAlphaGoW+0.5289 sgf
2 25 May 2017AlphaGoKe JieB+Res155 sgf
3 27 May 2017AlphaGoKe JieB+Res209 sgf
Result:
AlphaGo 3–0 Ke Jie

Background

At the time of the match Ke Jie was ranked 1st among all human players worldwide under Rémi Coulom's ranking system, and had held that position since late 2014.[2] Ke Jie was also ranked number one in the world under Korea Baduk Association's,[3] Japan Go Association's[4] and Chinese Weiqi Association's[5] ranking systems.

The version of AlphaGo in this match was AlphaGo Master, the one that defeated top pros in 60 online games,[6] using four TPUs on a single machine with Elo rating 4,858.[7] DeepMind claimed that this version was 3-stone stronger than the version used in AlphaGo v. Lee Sedol.[8] AlphaGo Master was actually the second best version that DeepMind had at the time, for it was already in possession of AlphaGo Zero, a version much stronger than the Master version; this can be known by the fact that Nature received their paper on AlphaGo Zero on April 7, before the games with Ke Jie.[7] DeepMind did not reveal the existence of AlphaGo Zero until the paper was published in Nature in October 2017.

Before the Future of Go Summit, AlphaGo Master defeated Ke Jie by three to zero during its 60 straight wins in the online games at the end of 2016 and beginning of 2017.[9]

Games

Summary

Google DeepMind offered $1.5 million winner prizes for this match while the losing side took $300,000 for participating in the three games.[10][11] AlphaGo won all three games against Ke Jie.[12][13] After the match between AlphaGo and Ke Jie, AlphaGo retired while DeepMind continued AI research in other areas.[14] AlphaGo was subsequently awarded a professional 9-dan title by the Chinese Weiqi Association.[15]

Game 1

On 23 May, AlphaGo (white) won by 0.5 points.

First 99 moves
Moves 100–199 (139 at )
Moves 200–289

Game 2

The second game was played on 25 May. About 1 hour into the game, Demis Hassabis tweeted that according to AlphaGo's evaluations, Ke was playing perfectly.[16] However, Ke later lost ground on the lower part of the board. About 4 hours into the game, AlphaGo simplified the position, and it became clear that Ke was losing.

AlphaGo (black) won by resignation after move 155.

First 99 moves
Moves 100–155 (104/132/137 at , 129/135 at 101)

Game 3

On 27 May, Ke Jie (white) resigned in game three, finishing the series with a 3–0 win for AlphaGo. At resignation, AlphaGo (black) had roughly an hour and a half of its time remaining, while Ke Jie had roughly 32 minutes left on the clock.

First 99 moves
Moves 100–199
Moves 200–209

Coverage

The game was censored in China. It is no longer censored as of 17 November 2018.[17]

See also

References
  1. "柯洁迎19岁生日 雄踞人类世界排名第一已两年" (in Chinese). May 2017.
  2. "History of Go Ratings". June 2017.
  3. "韩版围棋世界排名：与欧洲版差别大 连笑进前三" (in Chinese).
  4. "世界棋士レーティング（囲碁）" (in Japanese).
  5. "中国围棋等级分(17.05.31)" (in Chinese). Qipai.org. 6 June 2017. Archived from the original on 26 October 2017. Retrieved 26 October 2017.
  6. "Alphago: Learning from Scratch". DeepMind's official website. 18 October 2017. Retrieved 25 October 2017.
  7. Silver, David; Schrittwieser, Julian; Simonyan, Karen; Antonoglou, Ioannis; Huang, Aja; Guez, Arthur; Hubert, Thomas; Baker, Lucas; Lai, Matthew; Bolton, Adrian; Chen, Yutian; Lillicrap, Timothy; Fan, Hui; Sifre, Laurent; Driessche, George van den; Graepel, Thore; Hassabis, Demis (19 October 2017). "Mastering the game of Go without human knowledge" (PDF). Nature. 550 (7676): 354–359. doi:10.1038/nature24270. ISSN 0028-0836. PMID 29052630. S2CID 205261034.
  8. "AlphaGo棋力比去年涨三子 柯洁想赢它可能只剩一招" (in Chinese). Sina. 25 May 2017. Retrieved 1 June 2017.
  9. "韩媒：AlphaGo比去年强大太多 近日三次战胜柯洁" (in Chinese). Sina.com. 11 January 2017. Retrieved 1 November 2017.
  10. "World No.1 Go player Ke Jie takes on upgraded AlphaGo in May". 10 April 2017.
  11. "Ke Jie vs. AlphaGo: 8 things you must know". 27 May 2017.
  12. "Revamped AlphaGo Wins First Game Against Chinese Go Grandmaster". 23 May 2017.
  13. "Google's AlphaGo Continues Dominance With Second Win in China". 25 May 2017.
  14. "After Win in China, AlphaGo's Designers Explore New AI". 27 May 2017.
  15. "中国围棋协会授予AlphaGo职业九段 并颁发证书" (in Chinese). 27 May 2017. Retrieved 28 May 2017.
  16. "Hassabis' tweet".
  17. Hern, Alex (24 May 2017). "China censored Google's AlphaGo match against world's best Go player" – via The Guardian.

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