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Google’s AI Masters the Game of Go a Decade Earlier Than Expected

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hangchoi:
The final match: https://www.youtube.com/watch?v=mzpW10DPHeQ

A final match which was full of expectation, especially after Lee's win. Lee said that he at least found two weaknesses of AlphaGo, first was that AlphaGO played well when it was the white side, i.e. play later. The second was that it did not respond well on the unusual moves.

With that in mind, I expected that Lee would play some unusual moves in game 5, but it turned out that not many unusual moves.

Lee played very well at the beginning and AlphaGo seemed to make another mistake, which resulted in losing the lower right corner and quite a lot of white stones killed. I expected that Lee would win again at that time, as his territory was far larger than that of AlphaGo's.

However, AlphaGo fought back beautifully by taking territory bit by bit. At the end, the game was so close that Lee only resigned close to the finish, after he calculated that he cannot win. He was really disappointed.

Some professional said that Lee only lost 2.5 points. As Lee took the black side and played first, there was an adjustment that Lee had to get 7.5 points more than AlphaGo in order to win, i.e. for the territory per se, Lee was ahead of AlphaGo by 5 points.

I thought that Lee won all along this game and did not think that AlphaGo can win.

As I understand from AlphaGo from the press conference, AlphaGo played each move in accordance with its calculated winning probability. It does not care how many points he will win, as long as the move can enhance its winning probability. This needs a very deep calculating which I don't think human being can do. Like this game which Lee, as a professional,  or the commentator, who is a 9-dan professional, can roughly estimate how many points he is ahead or behind but they can never be so precise to know he is winning 1 or 2 points, but it seems AlphaGo can.

I do learn a lot by watching these games and it makes my hand etching to play some.  :D

hangchoi:
ON 23 May 2017, AlphaGO vs Ke Jie. This time it is a 3 round game. I expect that Ke Jie would never win a game, given that this AlphaGO is the newest version with lots of improvement and the record in a few months ago that Ke Jie was beaten by the Master (the computer account set up by Deep Mind team to test AlphoGo on internet GO game).

Ke Jie is the no. 1 ranking player in the world at the moment. Here is the link for his first game: https://www.youtube.com/watch?v=Z-HL5nppBnM

I found that Ke Jie played rather conservatively. He focused on getting as much territories as possible at the very beginning. Surprisingly, AlphaGo let him take up a lot of territories at the beginning, only defend a few of them. In the middle of the round, AlphaGo showed its planning worked. It built a solid foundation and surrounded the mid-field well. You can see Ke Jie kept losing his territories bit by bit. They had to play to the last move in order to distinguish the winner. At last, AlphaGo won by just a half point.

At least, even for a novice like me, I saw the AlphaGo was improving. It improved on the aspect that its calculation was faster and much more accurate. Besides, it strategy was well played and I am sure that AlphaGo knew he was winning at any time. That's why it allowed Ke Jie to take territories without severe defense. I doubt that AlphaGo was like playing its own game, as long as it was ahead of the opponent, it will play its own way, even the advantage was just 0.5 point.

An exciting game actually. Look forward to the next game.

hangchoi:
Round Two:

https://www.youtube.com/watch?v=1U1p4Mwis60

As expected, AlphaGo won. Ke Jie resigned in the later part of the game, unlike round 1 that he played till the last. However, Ke actually played much better than the first round but he envisaged that he cannot win before the end of the game. This time Ke Jie played some moves rather unusual and made AlphaGo taken more time to respond. In addition, Ke Jie played the white, the colour that he plays better. This is evident in the press conference after the game that AlphaGo analysed Ke Jie's moves in about the first 50 moves that their winning probability was about 50%, i.e. Ke played like AlphaGo.

A good challenge by Ke but a sad lost.

hangchoi:
Round Three:

https://www.youtube.com/watch?v=ru0E7N0-kFE

Ke said before the round that he would do his best, but it did not look like he did. He tried hard at the very beginning but somehow a few bad moves that dragged him into a hopeless game. In the middle of the game, even a novice like me can see that Ke was struggling to alive. Until later AlphaGo played a stone on the middle upper of the board, even I myself can see that Ke had no chance to win.

Among all three games, Ke played the best in the second round. He did well actually, tho he lost all 3. It cannot be comparable with Lee Sedol last year because AlphaGo had much improvement and its database has more that 100 million game. However, I think in a few years later, people will only remember that Lee Sedol is the only human being who can beat AlphaGo once.

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