<p>You can download the game record (.sgf) file from <a href="https://gogameguru.com/i/2016/03/Lee-Sedol-vs-AlphaGo-20160309.sgf" rel="nofollow">this link</a> and use an score estimator as in the KGS Goban (free), which will give you W+2.5 (including komi) and by looking at the screen we can see that AlphaGo could easily got additional points, so perhaps 5.5 as in the previous answer is the best estimate.</p>

CC BY-SA 3.0
2016-03-23T20:15:32.867Z
2016-03-23T20:15:32.867Z
Sergio Parreiras
<p>The DeepMind channel on Youtube has a short review of each game by Michael Redmond 9P.</p>

<p>At the end of the <a href="https://www.youtube.com/watch?v=bIQxOsRAXCo">summary for game 1</a>, Michael estimates that black is slightly ahead on the board. When you factor in the 7.5 point komi, it means that the final score would have been around 5.5 in favor of AlphaGo.</p>

<p>Note that </p>

<blockquote>
  <p>AlphaGo does not attempt to maximize its points or its margin of victory. It tries to maximize its probability of winning.</p>
</blockquote>

<p>[Source: <a href="http://www.wired.com/2016/03/googles-ai-wins-pivotal-game-two-match-go-grandmaster/">wired]</a></p>

CC BY-SA 3.0
2016-03-24T14:48:33.407Z
Yeah the last point is an important one. AlphaGo would prioritise a 100% chance of a 1 point win, over a 99% chance of a 5 point win. Not that that's a likely scenario
Jon Story
CC BY-SA 3.0
2016-03-14T15:28:17.520Z
2016-03-14T15:28:17.520Z
Christophe
<p>Today, the computer program <a href="https://en.wikipedia.org/wiki/AlphaGo" rel="nofollow">AlphaGo</a> from Google won against the Go world champion <a href="https://en.wikipedia.org/wiki/Lee_Sedol" rel="nofollow">Lee Sedol</a>. I read that it won by resignation. If I understand correctly, it means that Lee realized he could not win and accepted his defeat without ending the game.
My question is, by how many point AlphaGo would have won approximately if Lee had fought until the end?</p>

CC BY-SA 3.0
2016-03-09T09:32:32.720Z
The last time Michael Redmond (9p) counted in the live commentary he said black (Lee Sedol) is leading on the board, i.e. without komi. That means alphago's lead was less than 7.5 points. I will update if I find a source with a more precise counting.
havogt
CC BY-SA 3.0
2016-03-09T10:20:18.463Z
Myungwan Kim (9p) in his [live commentary](https://www.youtube.com/watch?v=6ZugVil2v4w) estimated white's lead to 3 1/2 or 4 1/2 points.
havogt
CC BY-SA 3.0
2016-03-09T10:25:56.963Z
Ok, but later at 2:23:40 he counted even or 1 point on the board for black, which would be 6.5 points for AlphaGo.
havogt
CC BY-SA 3.0
2016-03-10T12:15:51.623Z
This question could be asked for all matches played.
Kii
CC BY-SA 3.0
2016-03-10T16:25:02.133Z
For the record, in go the point difference is not necessarily a good measure of the difference in strength. This seems especially true in the case of AlphaGo, whose algorithm chooses the safest path to victory.
Christophe
CC BY-SA 3.0
2016-03-11T10:55:10.273Z
I'll even add that a close win by half a point is often more prestigious than a huge win by say twenty points.
Kii
<go><computer-ai>
By how many points did alphago win against Lee Se-dol?
Gilles Bonnet
# By how many points did alphago win against Lee Se-dol?

(Asked by: username_0 on 2016-03-09)

Today, the computer program [AlphaGo](https://en.wikipedia.org/wiki/AlphaGo) from Google won against the Go world champion [Lee Sedol](https://en.wikipedia.org/wiki/Lee_Sedol). I read that it won by resignation. If I understand correctly, it means that Lee realized he could not win and accepted his defeat without ending the game.
My question is, by how many point AlphaGo would have won approximately if Lee had fought until the end?

**Tags:** go, computer-ai

> **Comments:**
> **username_1**: The last time Michael Redmond (9p) counted in the live commentary he said black (Lee Sedol) is leading on the board, i.e. without komi. That means alphago's lead was less than 7.5 points. I will update if I find a source with a more precise counting.  
> **username_1**: Myungwan Kim (9p) in his [live commentary](https://www.youtube.com/watch?v=6ZugVil2v4w) estimated white's lead to 3 1/2 or 4 1/2 points.  
> **username_1**: Ok, but later at 2:23:40 he counted even or 1 point on the board for black, which would be 6.5 points for AlphaGo.  
> **username_2**: This question could be asked for all matches played.  
> **username_3**: For the record, in go the point difference is not necessarily a good measure of the difference in strength. This seems especially true in the case of AlphaGo, whose algorithm chooses the safest path to victory.  
> **username_2**: I'll even add that a close win by half a point is often more prestigious than a huge win by say twenty points.  

---

## 2 answers

### Answer by username_3 on 2016-03-14. Score: 7 | Accepted answer

The DeepMind channel on Youtube has a short review of each game by Michael Redmond 9P.

At the end of the [summary for game 1](https://www.youtube.com/watch?v=bIQxOsRAXCo), Michael estimates that black is slightly ahead on the board. When you factor in the 7.5 point komi, it means that the final score would have been around 5.5 in favor of AlphaGo.

Note that

> AlphaGo does not attempt to maximize its points or its margin of victory. It tries to maximize its probability of winning.

[Source: [wired]](http://www.wired.com/2016/03/googles-ai-wins-pivotal-game-two-match-go-grandmaster/)

> **Comments:**
> **username_5**: Yeah the last point is an important one. AlphaGo would prioritise a 100% chance of a 1 point win, over a 99% chance of a 5 point win. Not that that's a likely scenario  

---

### Answer by username_4 on 2016-03-23. Score: 3

You can download the game record (.sgf) file from [this link](https://gogameguru.com/i/2016/03/Lee-Sedol-vs-AlphaGo-20160309.sgf) and use an score estimator as in the KGS Goban (free), which will give you W+2.5 (including komi) and by looking at the screen we can see that AlphaGo could easily got additional points, so perhaps 5.5 as in the previous answer is the best estimate.


---

