DeepMind? published the algorithm in the journal Nature: https://storage.googleapis.com/deepmind-media/alphago/AlphaGoNaturePaper.pdf
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 for AlphaGo. Lee had been winning early in the game after AlphaGo could not correctly read out a two-stone edge squeeze and 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 on Tygem 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.
 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.).
- 15 minute video summaries of each game on YouTube: 1 2 3 4 5
- Full game videos, approx 5 hours each, on YouTube: 1 2 3 4 5
- Game records (sgf, plain moves)
- Game records (sgf, with comments of observers) (tictactoe was so kind to relay the games on KGS)
- Nature News http://www.nature.com/news/google-ai-algorithm-masters-ancient-game-of-go-1.19234
- Silver et al., "Mastering the game of Go with deep neural networks and tree search," Nature 529, 484-489 (2016) http://www.nature.com/nature/journal/v529/n7587/full/nature16961.html
- Google DeepMind http://deepmind.com/alpha-go.html
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).
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, Tyler Oyakawa ~3D Who is Master(P) #2 https://www.youtube.com/watch?v=9bUu2XFLxWw
06 2016-12-29 (AoXiang?(P)) Li Xiangyu - Magist
Chinese video, ??, https://www.youtube.com/watch?v=IoPpCQgB4BY
Chinese video, Mi Yuting 9p (is it he?), https://www.youtube.com/watch?v=CqUgsydtO_Y
11 2016-12-30 Master - (FengYu?(P)) Chen Hao
English, video, Tyler Oyakawa ~3D Who is Master(P)? #3 https://www.youtube.com/watch?v=8zuBPi9BjLo
English, text comments in SGF viewer, 6d, https://gokibitz.com/kifu/S16_4wYrg
Chinese, video, https://www.youtube.com/watch?v=ZrOuXGH3Jg8
Chinese video, Mi Yuting 9p with Meng Tailing 6p??, https://www.youtube.com/watch?v=52GT2XiptwU
English translated SGF, http://lifein19x19.com/forum/viewtopic.php?p=215719#p215719
English, video, Tyler Oyakawa ~3d(?), Who is Master(P)? #5 vs Kim Jiseok https://www.youtube.com/watch?v=y0KQ0z8Cxx4
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
Chinese video, Tang Weixing 9p with Meng Tailing 6p, https://www.youtube.com/watch?v=khOMKHTWOgw
English subtitled video, Tang Weixing 9p and Meng Tailing 6p, https://www.youtube.com/watch?v=QupHEQbuc30
Chinese video, Mi Yuting 9p (is it he?), https://www.youtube.com/watch?v=ip4J4KT-ZWI
English, video, Nick Sibicky(4D) Go Lecture #233 - Alpha Go Strikes Back! https://www.youtube.com/watch?v=v8Eh41m7gVA
English video, Simon Janin (3D) https://www.youtube.com/watch?v=XqCSwmcJqlQ
- Yonhap News Agency S. Korean Go master says upgraded AlphaGo 'too strong' for humans http://english.yonhapnews.co.kr/news/2017/01/10/0200000000AEN20170110005500315.html
- Korean JoongAng Daily, Learning from AlphaGo http://koreajoongangdaily.joins.com/news/article/article.aspx?aid=3028376