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 Post subject: Re: Values of moves #61 Posted: Mon Sep 17, 2018 11:01 am
 Oza

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John Fairbairn wrote:
...there are a few pointers that couch-potato go players need to bear in mind.
A lovely introduction to the topic!
Quote:
3. We could stop there, but again with O's method it's so easy to try a few more steps. Here's one. How much territory do we count for Black in the corner?
Thanks for the very nice and simple example. I got it right right away, probably because O Meien's method as you describe it is exactly what Kyle Blocher described in his video. In the video, which was made at the 2012 US go congress, he is asked whether pros use this method, and he answers that they don't. Was he wrong, or is O basically an outlier?

Quote:
My recommendation would be to ignore follow-ups for a while until you are at home with the method, and then add just one level of follow-up. This not only saves on flea powder but it also accords with O Meien's advice not to worry about the sixteenths.
This does seem in line with my wish to get a ballpark figure. I suppose there are a few halfpoint games that I'll just have to lose.

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 Post subject: Re: Values of moves #62 Posted: Mon Sep 17, 2018 11:17 am
 Lives in gote

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Position values and move values are not really that complicated as concepts. For simplicity, assume we have a position where either side may play first with equal probability. In an actual game, this can be a horrendous assumption, but it allows positions to be treated as independent.

The value of a complex position can be calculated by averaging the values of positions resulting from further play. Position value = 1/2 [ (value of resulting position if B plays first) + (value of resulting position if W plays first) ].

The value of a move in a position can be calculated by differencing the values of positions resulting from further play. Move value = 1/2 [ (value of resulting position if B plays first) - (value of resulting position if W plays first) ].

Of course these equations can be mixed if desired. Position value = (value of resulting position if B plays first) - (move value).

From this point of view, the value of a position is more fundamental than the value of a move. However, as has been pointed out, if you just want to find the value of a move, it may not be necessary to calculate the value of the position.

For the mathematically inclined, the value of the move is the derivative, with respect to the next play, of the value of the position.

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 Post subject: Re: Values of moves #63 Posted: Mon Sep 17, 2018 11:25 am
 Honinbo

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daal wrote:
I got it right right away, probably because O Meien's method as you describe it is exactly what Kyle Blocher described in his video. In the video, which was made at the 2012 US go congress, he is asked whether pros use this method, and he answers that they don't. Was he wrong, or is O basically an outlier?

Except for the use of multiples, which O does not do, everybody calculates the values of sente, gote, simple ko, and nidan (two stage) ko positions the same, going back at least 200 years. Where O (along with Blocher, Berlekamp, Wolfe, Mueller, myself, et al.) differs from the usual pro practice is in utilizing miai counting (Absolute™ counting) for plays and in taking whole board temperature into account (although he does not use that term). He also innovates by utilizing an error term of ¼ of the temperature.

Does Blocher talk about komaster? Pros have not caught on to that, unfortunately, even though Berlekamp published the idea back in 1994.

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 Post subject: Re: Values of moves #64 Posted: Mon Sep 17, 2018 11:28 am
 Lives with ko

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Bill Spight wrote:
bernds wrote:
]If I can compute the value of a move, why would I care about the value of a local position?
But you are not able to compute the value of a move without computing the value of local positions. daal computed the value of the move by computing the value of two positions, the one where Black had 5 pts. and the one where White had 1 pt. He did so by counting the local scores.

However, he cannot rely upon the local positions he uses to evaluate plays to be scorable. So he needs to be able to calculate the value of non-final (non-scorable) positions, as well.
I guess I'm still confused, as always when looking at this miai counting business. Let's take the first example from Sensei's library:

`[go]\$\$B Example diagram (gote)\$\$ . X X X X X X O O O O O .\$\$ . X . . . . X O . . . O .\$\$ . X . . . . . . . . . O .\$\$ -------------------------[/go]`
SL page wrote:
In Example 1[#2], the count is 2 (Black has 2 points more than White).
And I have to say that makes little sense to me. At the moment, no one has points. If we assume that everyone connects against a hane, then I can agree Black has two more points if we average the two possibilities, but in that case we could just look at a smaller section of the problem and say with the same justification that the count is zero.

The way it's stated it sounds like it should be important, I just don't see it. You're saying I can't just count up the final positions of a sequence of plays - what's the smallest example where that is the case?

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 Post subject: Re: Values of moves #65 Posted: Mon Sep 17, 2018 11:40 am
 Honinbo

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daal wrote:
This is a fine idea. Where might one find more such easy examples?

You might take a look at this post and the following in This 'n' That ( viewtopic.php?p=194704#p194704 ). I see that I post a problem pretty soon, but maybe it's not too difficult.

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 Post subject: Re: Values of moves #66 Posted: Mon Sep 17, 2018 11:41 am
 Oza

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Quote:
I got it right right away, probably because O Meien's method as you describe it is exactly what Kyle Blocher described in his video. In the video, which was made at the 2012 US go congress, he is asked whether pros use this method, and he answers that they don't. Was he wrong, or is O basically an outlier?

Both right and wrong, and yes and no. O Meien said he was surprised his method was not used in Japan, but it was normal in China. He probably meant Taiwan specifically, but I imagine they got it from mainand China anyway.

Quote:
Position values and move values are not really that complicated as concepts. For simplicity, assume we have a position where either side may play first with equal probability. In an actual game, this can be a horrendous assumption, but it allows positions to be treated as independent.

The value of a complex position can be calculated by averaging the values of positions resulting from further play. Position value = 1/2 [ (value of resulting position if B plays first) + (value of resulting position if W plays first) ].

The value of a move in a position can be calculated by differencing the values of positions resulting from further play. Move value = 1/2 [ (value of resulting position if B plays first) - (value of resulting position if W plays first) ].

Of course these equations can be mixed if desired. Position value = (value of resulting position if B plays first) - (move value).

From this point of view, the value of a position is more fundamental than the value of a move. However, as has been pointed out, if you just want to find the value of a move, it may not be necessary to calculate the value of the position.

For the mathematically inclined, the value of the move is the derivative, with respect to the next play, of the value of the position.

I'm sorry, but this is the kind of thing I meant when I said seeing it makes me lose the will to live. I understand every word but I have no idea what it means. Mathematicians actually speak mathlish. It may look like English, it may sound like English, but only other mathlanders understand it. And like the Eskimos and their 400 kinds of snow, I expect the go-playing mathlanders also have 400 kinds of sente.

Bill: De-iri is traditional counting. Since miai became mainstream only after I was born, I'm not sure I'm ready to accept that as traditional yet - and I know you're not young enough yourself to be an uberdude!

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 Post subject: Re: Values of moves #67 Posted: Mon Sep 17, 2018 11:54 am
 Honinbo

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bernds wrote:
Bill Spight wrote:
bernds wrote:
]If I can compute the value of a move, why would I care about the value of a local position?
But you are not able to compute the value of a move without computing the value of local positions. daal computed the value of the move by computing the value of two positions, the one where Black had 5 pts. and the one where White had 1 pt. He did so by counting the local scores.

However, he cannot rely upon the local positions he uses to evaluate plays to be scorable. So he needs to be able to calculate the value of non-final (non-scorable) positions, as well.
I guess I'm still confused, as always when looking at this miai counting business. Let's take the first example from Sensei's library:

`[go]\$\$B Example diagram (gote)\$\$ . X X X X X X O O O O O .\$\$ . X . . . . X O . . . O .\$\$ . X . . . . . . . . . O .\$\$ -------------------------[/go]`
SL page wrote:
In Example 1[#2], the count is 2 (Black has 2 points more than White).
And I have to say that makes little sense to me.

Like nearly every yose text aimed at non-mathematicians, the SL text is imprecise. To be precise, Black has 2 more points than White on average.

Quote:
At the moment, no one has points. If we assume that everyone connects against a hane, then I can agree Black has two more points if we average the two possibilities, but in that case we could just look at a smaller section of the problem and say with the same justification that the count is zero.

You mean like so?

`[go]\$\$B Example diagram 2\$\$ X X X O O O\$\$ . . X O . .\$\$ . . . . . .\$\$ -----------[/go]`

Yes, we could say that the count of this region is 0. Is that of any interest?

Quote:
The way it's stated it sounds like it should be important, I just don't see it.

Players are generally interested in who has more (expected) territory.

Quote:
You're saying I can't just count up the final positions of a sequence of plays - what's the smallest example where that is the case?

`[go]\$\$B Small position (all stones alive)\$\$ . X X X X O .\$\$ . X . . . O .\$\$ -------------[/go]`

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 Post subject: Re: Values of moves #68 Posted: Mon Sep 17, 2018 11:58 am
 Lives in gote

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bernds wrote:
Let's take the first example from Sensei's library:

`[go]\$\$B Example diagram (gote)\$\$ . X X X X X X O O O O O .\$\$ . X . . . . X O . . . O .\$\$ . X . . . . . . . . . O .\$\$ -------------------------[/go]`
SL page wrote:
In Example 1[#2], the count is 2 (Black has 2 points more than White).
And I have to say that makes little sense to me. At the moment, no one has points. If we assume that everyone connects against a hane, then I can agree Black has two more points if we average the two possibilities, but in that case we could just look at a smaller section of the problem and say with the same justification that the count is zero.

The way it's stated it sounds like it should be important, I just don't see it. You're saying I can't just count up the final positions of a sequence of plays - what's the smallest example where that is the case?

It's arbitrary, but you have to start somewhere in order to compare the values of later positions to the starting position. So imagine that are already there:

`[go]\$\$B Example diagram (gote)\$\$ . X X X X X X O O O O O .\$\$ . X a . . . X O . . . O .\$\$ . X a . . . B W . . . O .\$\$ -------------------------[/go]`

Then we count 8 - 6 = 2. But we don't have to do that. We could as easily think that the points marked 'a' are not likely to be affected as we study this, they will always be black's unless black is killed, which is not the assumption of this problem. So if you don't count the 'a' points, then the score is 0, which is easier to remember than 2.

Indeed, if the diagram shown were like this, I would probably only count the a's for black and the b's for white.

`[go]\$\$B black has a lot of points not in play\$\$ . X X X X X X X X X X O O O O O .\$\$ . X . . . . . . a a X O b b . O .\$\$ . X . . . . . . a a . . b b . O .\$\$ ---------------------------------[/go]`

0 is easy to remember.

(Edit: Fix Diagram to put in clear line. Thanks, Bill.)

Last edited by Calvin Clark on Sat Sep 22, 2018 11:24 pm, edited 1 time in total.
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 Post subject: Re: Values of moves #69 Posted: Mon Sep 17, 2018 12:00 pm
 Honinbo

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John Fairbairn wrote:
Mathematicians actually speak mathlish. It may look like English, it may sound like English, but only other mathlanders understand it. And like the Eskimos and their 400 kinds of snow, I expect the go-playing mathlanders also have 400 kinds of sente.

Mathlanders have only one or two kinds of sente, but I have redefined one of them as ambiguous. It's regular go players who have multiple meanings of sente, often without realizing it.

Quote:
Bill: De-iri is traditional counting. Since miai became mainstream only after I was born, I'm not sure I'm ready to accept that as traditional yet - and I know you're not young enough yourself to be an uberdude!

Sorry for not being clear. O's method of calculating the value of a position is traditional. That's what I was talking about.

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 Post subject: Re: Values of moves #70 Posted: Mon Sep 17, 2018 12:01 pm
 Tengen

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Counts (values of local positions) are used for accurate positional judgement, calculation of moves values, calculation of gains, distinctions of gote/sente, identification of good moments of tenuki and determination of correct move orders. After a move, earlier calculated counts of earlier follow-ups are still useful. For all these reasons, counts are not throw-away objects. They are as important as move values.

Although beginners of endgame evaluation should indeed start with simple local endgames without follow-ups, later follow-ups can easily be relevant especially if they are large, or make some branch larger than other branches. Not just for the sake of evaluation itself but also for finding the more valuable moves.

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 Post subject: Re: Values of moves #71 Posted: Mon Sep 17, 2018 12:18 pm
 Lives in gote

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`[go]\$\$W okay, maybe I have to count\$\$ . X X X X X X X X X X O O O O . .\$\$ . X . . . . . . . . X O . . O . .\$\$ . X . . . . . . 1 . O . . . O . .\$\$----------------------------------[/go]`

Yes, as Robert states, eventually one may have to leave the parrot zone, when black may chose to allow , which is more like a real game situation.

Last edited by Calvin Clark on Sat Sep 22, 2018 11:25 pm, edited 1 time in total.
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 Post subject: Re: Values of moves #72 Posted: Mon Sep 17, 2018 12:30 pm
 Honinbo

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The material in this post ( viewtopic.php?p=195326#p195326 ) and the following are pretty easy, I think, but not traditional.

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 Post subject: Re: Values of moves #73 Posted: Mon Sep 17, 2018 12:33 pm
 Honinbo

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@ Calvin

You can add the edges of the board to diagrams, comme ça.

`[go]\$\$W okay, maybe I have to count\$\$ . X X X X X X X X X X O O O O . . |\$\$ . X . . . . . . . . X O . . O . . |\$\$ . X . . . . . . 1 . O . . . O . . |\$\$ ---------------------------------[/go]`

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 Post subject: Re: Values of moves #74 Posted: Mon Sep 17, 2018 1:02 pm
 Lives with ko

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Bill Spight wrote:
Yes, we could say that the count of this region is 0. Is that of any interest?
In the sense of causing confusion along the lines of "so why does it state that you start by assigning a count, when the number is arbitrary and therefore unimportant?" In Daal's original example, you gave a value of 0 for a move at A, and chose not to discuss the size of the play. Once again that seems to give priority to the question of the value of a position (and you also said "The value of positions is basic"), but I struggle to understand how it is relevant to the question of where to play.

A lot of material both here and on SL seems unnecessarily opaque, it sometimes feels like it's trying to generate mystique rather than trying to be helpful.

Quote:
`[go]\$\$B Small position (all stones alive)\$\$ . X X X X O .\$\$ . X . . a O .\$\$ -------------[/go]`
So... what's special about it? Uncertainty whether A is sente for White or not? So how do you go about assigning a count, and how does it help you decide the size of a move at A?

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 Post subject: Re: Values of moves #75 Posted: Mon Sep 17, 2018 1:19 pm
 Lives in sente

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By the way, if anyone is looking for simple counting examples, and doesn't mind using deiri counting rather than miai counting, Lee Chang-Ho's Endgame Techniques Volume 1 (unfortunately only available in the GoBooks app, I forget why) has tons of examples with very clear explanations, starting from the trivial and working up to ones that are complex enough that I wouldn't bother to work it all out even in a correspondence game. Volume 2 is also very nice but is about endgame tesuji.

For anyone here who happens to already be a member of the Yunguseng Dojang, In-seong Hwang has a bunch of very nice endgame-counting problem-solving lecture videos in which the problems progress nicely over the course of each lecture, again starting with very simple ones.

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 Post subject: Re: Values of moves #76 Posted: Mon Sep 17, 2018 2:48 pm
 Oza

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bernds wrote:
.

Quote:
`[go]\$\$B Small position (all stones alive)\$\$ . X X X X O .\$\$ . X . . a O .\$\$ -------------[/go]`
So... what's special about it? Uncertainty whether A is sente for White or not? So how do you go about assigning a count, and how does it help you decide the size of a move at A?

As far as I gather, assigning a count means to claim that black has x points even though the position is unfinished. This is done by averaging the possible outcomes. In the above example, either black plays at a giving him two points or white plays there creating a second situation in which black could get either one or zero points. This second situation is interpreted as meaning that black has half a point. This value allows us to get an average for the original position, which is (2 + 0.5): 2, or 1.25. So when we look at this unfinished position, we can give it a value , a count, of 1.25. From this, we see that if black plays at a, he gains .75 points. Likewise, white would also gain .75 by playing there. That is what the move is worth, and that number can be compared with other similarly derived numbers to determine the biggest move. The count has a further significance which is that we can add them up to see who is ahead. Corrections welcome.

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 Post subject: Re: Values of moves #77 Posted: Mon Sep 17, 2018 3:31 pm
 Honinbo

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bernds wrote:
Bill Spight wrote:
Yes, we could say that the count of this region is 0. Is that of any interest?
In the sense of causing confusion along the lines of "so why does it state that you start by assigning a count, when the number is arbitrary and therefore unimportant?" In Daal's original example, you gave a value of 0 for a move at A, and chose not to discuss the size of the play.

Nope. I gave a rough estimate of the position around A as 0 because of approximate symmetry.

I did discuss the size of a play at A. I gave a rough estimate that the play gains 12 pts.

It's only if you believe that a play at A is a free lunch that you do not have to worry about the size of the play. daal regarded the play as a free lunch. I did not.

Quote:
Once again that seems to give priority to the question of the value of a position (and you also said "The value of positions is basic"), but I struggle to understand how it is relevant to the question of where to play.

What position do you want to play to?

Quote:
A lot of material both here and on SL seems unnecessarily opaque, it sometimes feels like it's trying to generate mystique rather than trying to be helpful.

As far as the SL material goes, it is mostly imprecise because of its intended audience. As for material here, what can I say? What do you think of the material I linked to in This 'n' That?

Quote:
Quote:
`[go]\$\$B Small position (all stones alive)\$\$ . X X X X O .\$\$ . X . . a O .\$\$ -------------[/go]`
So... what's special about it? Uncertainty whether A is sente for White or not? So how do you go about assigning a count, and how does it help you decide the size of a move at A?

My guess that what is special about it is that it seems to be opaque to you. If you can calculate the size of a move at a, how do you go about it?

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 Post subject: Re: Values of moves #78 Posted: Mon Sep 17, 2018 3:54 pm
 Lives with ko

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Bill Spight wrote:
bernds wrote:
Quote:
`[go]\$\$B Small position (all stones alive)\$\$ . X X X X O .\$\$ . X . . a O .\$\$ -------------[/go]`
So... what's special about it? Uncertainty whether A is sente for White or not? So how do you go about assigning a count, and how does it help you decide the size of a move at A?

My guess that what is special about it is that it seems to be opaque to you. If you can calculate the size of a move at a, how do you go about it?

The way I see it - if Black plays there, he has two points, and if not, it's fifty-fifty whether Black gets a point or not. So that would make it a 1.5 point gote. One could also imagine a situation where nothing else is on the board, in which case it would be a 1 point sente (from White's perspective).

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 Post subject: Re: Values of moves #79 Posted: Mon Sep 17, 2018 4:16 pm
 Lives in gote

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Maybe pictures are better?

`[go]\$\$ Start\$\$ . X X X X O .\$\$ . X . . o O .\$\$ -------------[/go]`

This problem is simple because the best move for both sides is obvious and happens to be the same point. The difficulty is that a little bit of recursion is required, giving a result with fractional points.

Value of Start position =
1/2 (value of position B)
`[go]\$\$ position B\$\$ . X X X X O .\$\$ . X . . X O .\$\$ -------------[/go]`

+ 1/2 (value of position W)
`[go]\$\$ position W\$\$ . X X X X O .\$\$ . X . o O O .\$\$ -------------[/go]`

But value of position W is not yet known.

Value of position W =
1/2 (value of position WB)
`[go]\$\$ position WB\$\$ . X X X X O .\$\$ . X . X O O .\$\$ -------------[/go]`

+ 1/2 (value of position WW)
`[go]\$\$ position WW\$\$ . X X X X O .\$\$ . X . O O O .\$\$ -------------[/go]`

Now we can go back and calculate the value of the starting position:
Position Value = 1/2[2+1/2(1+0)] = 1/2(2+1/2) = 1+1/4

The value of the starting move is calculated from these same diagrams, just take the difference instead of the average:
Move Value = 1/2[2-1/2(1+0)] = 1/2(2-1/2) = 3/4

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 Post subject: Re: Values of moves #80 Posted: Mon Sep 17, 2018 4:17 pm
 Honinbo

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bernds wrote:
Bill Spight wrote:
bernds wrote:
`[go]\$\$B Small position (all stones alive)\$\$ . X X X X O .\$\$ . X . . a O .\$\$ -------------[/go]`

So... what's special about it? Uncertainty whether A is sente for White or not? So how do you go about assigning a count, and how does it help you decide the size of a move at A?

My guess that what is special about it is that it seems to be opaque to you. If you can calculate the size of a move at a, how do you go about it?

The way I see it - if Black plays there, he has two points, and if not, it's fifty-fifty whether Black gets a point or not. So that would make it a 1.5 point gote. One could also imagine a situation where nothing else is on the board, in which case it would be a 1 point sente (from White's perspective).

Thanks. To be clear, what do you mean by "if not"? What do you mean by "it's fifty-fifty whether Black gets a point or not"?

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