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Computer go bot developed by Google DeepMind.
Combines MCTS with two neural networks: a policy network and a value network.
DeepMind? published the algorithm in the journal Nature: https://storage.googleapis.com/deepmind-media/alphago/AlphaGoNaturePaper.pdf
October 2015 - First AI program to defeat a professional player on a 19x19 board without any handicap. This was against the French player Fan Hui (2p) who lost 0-5[1].
March 2016 - Defeated Lee Sedol 4-1 in a 5-game match with a prize purse of one million USD. AlphaGo won the first three games by resignation. Then, in the fourth game, Lee Sedol played a tesuji in the centre that led to victory after it had looked like AlphaGo had been winning in the opening. AlphaGo made several clear mistakes before resigning, showing how its policy networks are susceptible to over-valuing forcing moves if they lead to a higher perceived winning percentage. In a close match, Lee resigned the fifth game, giving a final score of 4-1 forAlphaGo. Lee had been winning early in the game after AlphaGo could not correctly read out a two-stone edge squeezeand made a mistake locally, but later in the game he neglected to play a more aggressive extension in the upper part of the board, instead preferring to play safe and make eye shape. When Lee resigned, AlphaGo was estimated to be winning by about 2.5 points, with 7.5 komi under Chinese scoring.
December 2016-January 2017 - Defeated top pro players 60 times in a row online, playing anonymously as "Master". A 61st game was called off because AlphaGo's opponent disconnected. The games were played with short time controls onTygem and FoxGo?. It seems clear that AlphaGo is now superhuman at the game of Go, and pros probably need to take at least a 2 stone handicap to be even with it.
[1] These are the results of the five formal games with longer time controls. Five informal games with shorter time controls were also played and Fan Hui won two of them by resignation (see Silver et al. 2016; p. 493). The kifu of the formal games seem to be available at page 488 (op. cit.).
Between 2016-12-29 and 2017-01-05 AlphaGo played games under aliases Magist and Master(P) on Tygem and Foxy servers against tens of professional players, among them the highest ranking players of the time Ke Jie 9p and Park Junghwan 9p. This collection consists of 60 games which all AlphaGo won (except one in which opponent connection was lost and is marked as tie).
SGF collection of 60 games by Marcel Grünauer http://rechne.net/dl/the_master_files.zip or as pdf:
https://www.mindo.io/alphago_60_games.pdf
Games 1-41 could be viewed on browser at http://www.go-baduk-weiqi.de/masterp-schlaegt-go-profis/ (German site) and games 42-60
http://www.go-baduk-weiqi.de/masterp-alias-mastergo-spielt-60zu0/ (in German)
Here are commentaries or analysis by various people on game by game (player names fixed per https://www.reddit.com/r/baduk/comments/5ozzp7/complete_list_of_masters_opponents/ ).
English, video, Tyler Oyakawa ~3D https://www.youtube.com/watch?v=ABRLrxT9dkw&t=126s
English, video, Michael Redmond 9p https://www.youtube.com/watch?v=9z1aRyynaBI
Corresponding sgf-file with variations: http://www.usgo.org/news/wp-content/uploads/2017/03/master01_NNannotated.sgf
English, video, Tyler Oyakawa ~3D Who is Master(P) #2 https://www.youtube.com/watch?v=9bUu2XFLxWw
English, video, Michael Redmond 9p https://www.youtube.com/watch?v=LJ8d_KTKZ-Q
Corresponding sgf-file with variations: http://www.usgo.org/news/wp-content/uploads/2017/03/master02_NN_annotated.sgf
English, video, Michael Redmond 9p https://www.youtube.com/watch?v=3jGkC9jeU5s
Corresponding sgf-file with variations: http://www.usgo.org/news/wp-content/uploads/2017/03/master04_Xie_Erhao.sgf
English, video, Brady Daniels ~3d, AlphaGo - Whatever You Do Is Wrong, https://youtu.be/6rB2cYOeppQ
Chinese video, ??, https://www.youtube.com/watch?v=IoPpCQgB4BY (no longer available?)
English, video, Michael Redmond 9p https://www.youtube.com/watch?v=PZW_HXg714s
Corresponding sgf-file with variations: http://www.usgo.org/news/wp-content/uploads/2017/03/master09_Meng_Tailing.sgf
Chinese video, Mi Yuting 9p (is it he?), https://www.youtube.com/watch?v=CqUgsydtO_Y (no longer available?)
English, video, Tyler Oyakawa ~3D Who is Master(P)? #3 https://www.youtube.com/watch?v=8zuBPi9BjLo
English, video, Brady Daniels ~3d, Appreciating AlphaGo, https://youtu.be/6rB2cYOeppQ
English, video, Michael Redmond 9p https://www.youtube.com/watch?v=2BCcxfyvh1w
Corresponding sgf-file with variations: http://www.usgo.org/news/wp-content/uploads/2017/03/master17_Lian_Xiao.sgf
English, video, Haylee 4p, Haylee's World of Go/Baduk, AlphaGo's Online Game Review 1 - Ke Jie, https://www.youtube.com/watch?v=b_24iaUMRFs
English, text comments in SGF viewer, 6d, https://gokibitz.com/kifu/S16_4wYrg
Chinese, video, https://www.youtube.com/watch?v=ZrOuXGH3Jg8 (no longer available?)
English video, Jennie Shen 2p translating commentaries of Meng Tailing 6p and adding own analysis, https://www.youtube.com/watch?v=8AqoP_N2WVU
English, video, Haylee 4p, Haylee's World of Go/Baduk, AlphaGo's Online Game Review 2 - Ke Jie, https://www.youtube.com/watch?v=_NR_K4oPtCU
English, video, Haylee 4p, Haylee's World of Go/Baduk, AlphaGo's Online Game Review 3 - Park Junghwan https://www.youtube.com/watch?v=xrOv9lqi4xE
Chinese video, Mi Yuting 9p with Meng Tailing 6p??, https://www.youtube.com/watch?v=52GT2XiptwU (no longer available?)
English, video, Michael Redmond 9p https://www.youtube.com/watch?v=9D7h3ROQzAI
Corresponding sgf-file with variations: http://www.usgo.org/news/wp-content/uploads/2017/04/master15_ParkJunghwan_Master_Redmond.sgf
Remark: In the video and sgf-file the game is erroneously referred to as #15.
English video, Michael Redmond 9p https://www.youtube.com/watch?v=G5OKn2lWICk
Corresponding sgf-file with variations: http://www.usgo.org/news/wp-content/uploads/2017/05/RR08-master22_Master-Chen_Yaoye-2_final.sgf
English, video, Tyler Oyakawa ~3d(?), Who is Master(P)? #5 vs Kim Jiseok https://www.youtube.com/watch?v=y0KQ0z8Cxx4
English, video, Michael Redmond 9p https://www.youtube.com/watch?v=RJh_EJcDx8Q
English video, Jennie Shen 2p translating commentaries of Meng Tailing 6p and adding own analysis, https://www.youtube.com/watch?v=aTbxf8-w6AE
English, video, Haylee 4p, Haylee's World of Go/Baduk, AlphaGo's Online Game Review 4 - Park Junghwan https://www.youtube.com/watch?v=bO9CvC7lZ-o
English translated SGF, http://lifein19x19.com/forum/viewtopic.php?p=215719#p215719
English, video, Dwyrin 5d, AlphaGo vs Tygem - An 8p Falls to Master(P), https://www.youtube.com/watch?v=z9P8wG6b4-8
English, video, Brady Daniels ~3d, AlphaGo - Whatever You Do Is Wrong, https://youtu.be/6rB2cYOeppQ?t=19m36s
English translation, Mi Yuting 9p with Meng Tailing 6p, Text in SGF viewer in Forum, http://www.lifein19x19.com/forum/viewtopic.php?p=215654#p215654
Chinese video, ??, https://www.youtube.com/watch?v=ifKtZFGaO5k (no longer available?)
English video, Jennie Shen 2p translating commentaries of Meng Tailing 6p and adding own analysis, https://www.youtube.com/watch?v=0y7DUHzWOEg
Chinese video, Tang Weixing 9p with Meng Tailing 6p, https://www.youtube.com/watch?v=khOMKHTWOgw (no longer available?)
English subtitled video, Tang Weixing 9p and Meng Tailing 6p, https://www.youtube.com/watch?v=QupHEQbuc30
English video, Jennie Shen 2p translating commentaries of Meng Tailing 6p and adding own analysis, https://www.youtube.com/watch?v=T7dJbrNPLZs
English video, Michael Redmond 9p https://www.youtube.com/watch?v=d_LJnMlwPeQ
Corresponding sgf-file with variations: http://www.usgo.org/news/wp-content/uploads/2017/05/RR11-master31_Li_Qincheng-Master_final.sgf
English, video, Michael Redmond 9p https://www.youtube.com/watch?v=YmH7ChHp6rM
Corresponding sgf-file with variations: http://www.usgo.org/news/wp-content/uploads/2017/04/2016.04.22_RR12-master32-Master-Gu_Li_kgs-variations04.03.sgf
English, video, Michael Redmond 9p https://www.youtube.com/watch?v=Ymgv3kdLLXg
Corresponding sgf-file with variations: http://www.usgo.org/news/wp-content/uploads/2017/04/RR13-master33_Gu_Li_02_annotated.sgf
English, video, Michael Redmond 9p https://www.youtube.com/watch?v=1vVe1pKmhQ4
Corresponding sgf-file with variations: http://www.usgo.org/news/wp-content/uploads/2017/05/RR14_master35_Jiang_Weijie_01_annotated-final.sgf
English video, Michael Redmond 9p https://www.youtube.com/watch?v=gWabLAkvpIQ
Corresponding sgf-file with variations: http://www.usgo.org/news/wp-content/uploads/2017/05/RR15_master36_Gu_Zihao_01_final.sgf
English video, Ryan Li 1p & Stephanie Yin 1p, https://www.youtube.com/watch?v=tgPuGxqlQrY
Chinese video, Mi Yuting 9p (is it he?), https://www.youtube.com/watch?v=ip4J4KT-ZWI (no longer available?)
Haylee: AlphaGo's Online Game Review 5 - Kim Jiseok : https://www.youtube.com/watch?v=on314lXDv9Q
English video, Ryan Li 1p & Stephanie Yin 1p, https://www.youtube.com/watch?v=8ye-L4JdAxM
English video, Michael Redmond 9p https://www.youtube.com/watch?v=zYOQ2Xwpedg
Corresponding sgf-file with variations: http://www.usgo.org/news/wp-content/uploads/2017/05/RR16_master47_Tan_Xiao_FINAL.sgf
English, video, Nick Sibicky(4D) Go Lecture #233 - Alpha Go Strikes Back! https://www.youtube.com/watch?v=v8Eh41m7gVA
English video, Michael Redmond 9p https://www.youtube.com/watch?v=aXsZGEqe1kA
Corresponding sgf-file with variations: http://www.usgo.org/news/wp-content/uploads/2017/05/2017.05.14_master48_Park_Jungwhan_final.sgf
English video, Simon Janin (3D) https://www.youtube.com/watch?v=XqCSwmcJqlQ
English, video, Michael Redmond 9p https://www.youtube.com/watch?v=O375GjxwhhQ
Corresponding sgf-file with variations: http://www.usgo.org/news/wp-content/uploads/2017/05/2017.04.27_master-ke-jie51-kgscomments-final.sgf