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 Post subject: Re: Nakade
Post #21 Posted: Thu Sep 05, 2013 10:38 pm 
Judan

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Derive necessarily from force in the Japanese 2003 Rules v35a or in one of the ko definition papers. "set of intersection": sure, if you want to avoid informal use of "region".

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Post #22 Posted: Thu Sep 05, 2013 11:31 pm 
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cyclops wrote:
How would you translate "can necessarily" into German? "Kann unbedingt"?

I presume Robert means what most people would mean informally by "can unconditionally".

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 Post subject: Re: Nakade
Post #23 Posted: Fri Sep 06, 2013 4:01 am 
Judan

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Force is not about being unconditional, but involves the opponent's resistance.

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 Post subject: Re: Nakade
Post #24 Posted: Fri Sep 06, 2013 4:04 am 
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Funny, I feel that I understand the Japanese go-terms better than I do the English interpretations being thrown around in this thread. :scratch:

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 Post subject: Re: Nakade
Post #25 Posted: Fri Sep 06, 2013 4:25 am 
Judan

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Maybe you imagine one string surrounding a space with exactly one obvious vital point and being surrounded by opposing stones? This is the simple case. However, there is a much greater variety of shapes, even if you think in Japanese language:)

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 Post subject: Re: Nakade
Post #26 Posted: Fri Sep 06, 2013 5:06 am 
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RobertJasiek wrote:
Maybe you imagine one string surrounding a space with exactly one obvious vital point and being surrounded by opposing stones? This is the simple case. However, there is a much greater variety of shapes, even if you think in Japanese language:)

But then it would be very advisable to choose another term.

"Nakade" is strongly connected with the property of being a vital point for eye shape.

If a group has another eye elsewhere already, as in some of your examples, "Nakade" loses its entire meaning.

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 Post subject: Re: Nakade
Post #27 Posted: Fri Sep 06, 2013 5:55 am 
Judan

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Cassandra wrote:
But then it would be very advisable to choose another term.


Also eyespace has a great variety of meanings. Rather than introducing new terms, one can identify varieties by denoting the types, as in nakade-(type-)1, nakade-(type-)2.

Quote:
"Nakade" is strongly connected with the property of being a vital point for eye shape.


No. Rather a few types / uses of the word are, while other types / uses are not. In particular, there is also the use "no vital point" (because it is occupied by a stone of one of the attacker's strings or because the shape does not have any vital point, such as an empty block of four).

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If a group has another eye elsewhere already, as in some of your examples, "Nakade" loses its entire meaning.


It does not lose its meaning. Quite contrarily, it still exists in a richer context! E.g., "A group with two separate nakade eyes can be killed by a ko threat and its follow-up cutting the group and its eyes apart."

*************************************************************

Click Here To Show Diagram Code
[go]$$B necessary fill condition
$$ ------------------
$$ | C W W X . . . . .
$$ | W C W X . . . . .
$$ | W W X X . . . . .
$$ | X X X . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]


The "fill" condition is necessary so that an opponent's independently live formation is not confused with a nakade. (Black cannot almost-fill and cannot partition the marked region.)

Click Here To Show Diagram Code
[go]$$B necessary cannot partition condition
$$ ------------------
$$ | X C C C X . . . .
$$ | X C X C X . . . .
$$ | X X X X X . . . .
$$ | . . . , . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]


The "cannot partition" condition is necessary so that a connected part of an eyespace providing at least two eyes is not mistakenly identified as a nakade. (Black can almost-fill and can partition the marked region.)

EDIT: corrections

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 Post subject: Re: Nakade
Post #28 Posted: Fri Sep 06, 2013 7:38 am 
Oza
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Robert, is there a significant difference between:

...the defender moving first can necessarily fill all but one of the intersections of the region...

and

...the defender moving first can fill all but one of the intersections of the region...?

If so, what is it?

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 Post subject: Re: Nakade
Post #29 Posted: Fri Sep 06, 2013 10:11 am 
Judan

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daal wrote:
...the defender moving first can fill all but one of the intersections of the region...?


Anyway, what must be expressed or implied is that the players alternate and the opponent resists (tries to oppose) the defender's aim. "can" is too weak, because it could mean "let the defender play successive moves". "necessarily" is a gentle reminder that it is not the dullest meaning of "can"; maybe too gentle:) If you think so, write "force", or even explain it or at least its implications (opponent's opposite aim, per turn at least one move fulfilling a purpose versus none / all) in a commentary for such definitions.

Defender's aim: almost-fill.
Attacker's aim: prevent the defender from almost-filling.
The opposite of either aim is the other's aim.

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 Post subject: Re: Nakade
Post #30 Posted: Fri Sep 06, 2013 1:53 pm 
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RobertJasiek wrote:
The value of research, building on top of prior work, cataloguing, pushing the overall knowledge a step further has a tremendous value not only for the theorists, but also for practical applications. Maybe not always immediately, but surely later. It is the general effect of fundamental research. This is so also for a careful definition of nakade.


This sounds right in principle, but has it been actually demonstrated in the field in question? This is part of my unease about the value of what you do. As you can say is that generally speaking, formal research is a good thing. But what if Go is different, what if in Go formal research does not bring much fruit?

I base that uncertainty mainly on two points:

Point #1:
After all this time, it is absolutely not clear to me what practical value is there in all this. Can I get stronger by reading a formal definition of 'nakade'? You keep saying 'eventually', but it seems 'eventually' never comes... Or if it does, it comes too slow for me to notice. You're at it for what? 20 years? 30? 40? When do you expect to see measurable practical results due to all this research? In general.

Point #2:
The fact that I look at other similar fields. For example: chess. I know a lot of formal research has been done in chess, especially in the old Soviet Union, tremendous amounts of money have been spent, and yet it did not seem to have contributed very much. From what I understand, the high level of play in SU was due mostly to incentives and refining traditional methods, not formal theoretical research. They had tons of paid researchers, formal institutes, and what not. But after all this huge effort spanning decades and backed up by resources of a whole country, it seems that the best and fastest way to learn chess is still the old-fashioned way of rote memorization, examples, tactical problem solving, and simply experience.

I mean - I know you are having fun, but is this research only for the sake of research, or to appease some personal itch you have?

RobertJasiek wrote:
Aims of nakade definition research: I am doing this research, because I am in urgent need for its application when teaching life and death more profoundly than by only repeating known standard examples.


I seriously hope you are not going to roll out your formal definitions when teaching.... No offense.
But that's beside the point here.

RobertJasiek wrote:
Traditional methods: why. There has been (almost) only one method: teaching by examples:) Even you will admit that more methods can be better than only one method. Careful definitions are a means to then develop more methods.


Can I really admit that? Again - this is something that "in general" sounds good, but is it true in this case? What if the traditional method is the best and most efficient? What do we gain by putting so much effort ad resources into developing alternate methods. Maybe if you put all this effort into studying Go the traditional way, you would have been a top pro by now? We will simply never know...

Look at the chess example I gave above.

True, you might say we never know until we try, and you are right. But then the best we can say is: lets try and see how it goes. We cannot say: what we do is extremely valuable and/or important. We simply do not know... yet. Indications seem to go both ways, depending which field of study you look at.

So, back to your statement of me admitting that more methods is better than one. Yes, I can. If we have a cheap choice, if a new method or a bunch of new methods is handed to us, I would say - sure, take it. We lose nothing, even if these methods are not very good or very practical. However - this is not the case here, we are faced with a lot of effort to derive at these new methods (true, not my effort, but still effort) - so in principle, some kind of cost-to-reward analysis would be interesting.

Well - its all moot anyways, because I suspect you are simply having a lot of fun doing all that, and you would do it even if it could be proven that it will never have much practical use. More power to you, I have no problem with that. What I question is you repeatedly stressing how important and valuable it is what you do. I am not saying you are wrong, I am just saying this has not be demonstrated yet.

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 Post subject: Re: Nakade
Post #31 Posted: Fri Sep 06, 2013 7:00 pm 
Judan

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Bantari,

Quote:
Can I get stronger by reading a formal definition of 'nakade'?


Probably not, you are too strong for that to notice an effect on your strength. Nakade definition is ca. 30k level of go theory understanding. Related applied research can make you stronger (unless you already know it), such as semeai theory, which relies on a definition of semeai-eye.

However, as a follower of Kageyama, I believe in the power of the fundamentals. The clearer one's understanding of the fundamentals (such as knowing what is vs. is not a nakade), the more accurately / faster one can apply it (e.g., to solving LD problems). Probably, you cannot figure the effect. As little as you can figure the effect of having solved a few more LD problems. The effect is too small to be measurable, but IMO it exists.

See also
viewtopic.php?p=147287&sid=e6b97b2012c20bf0ba3c096525787571#p147287

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 Post subject: Re: Nakade
Post #32 Posted: Sat Sep 07, 2013 4:01 pm 
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RobertJasiek wrote:
Bantari,

Quote:
Can I get stronger by reading a formal definition of 'nakade'?


Probably not, you are too strong for that to notice an effect on your strength. Nakade definition is ca. 30k level of go theory understanding. Related applied research can make you stronger (unless you already know it), such as semeai theory, which relies on a definition of semeai-eye.


So... those who are able to understand it are too strong to benefit from it. And those who could benefit from it are too weak to understand it... All we can say for sure that whoever is interested in formal research might find it interesting.

Research for the sake of research? Or what are we talking about?

RobertJasiek wrote:
However, as a follower of Kageyama, I believe in the power of the fundamentals.


Something tells me Kageyama would turn in his grave if he knew you use his name in this context... ;)

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 Post subject: Re: Nakade
Post #33 Posted: Sat Sep 07, 2013 11:42 pm 
Judan

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Bantari wrote:
those who are able to understand it are too strong to benefit from it.


This is an unkind implication, which I have not suggested. That you are too strong to measure an effect on your playing strength does not imply that you could not benefit from it, if you wanted.

Quote:
And those who could benefit from it are too weak to understand it...


Nobody is too weak to understand "can fill", "cannot partition", "without seki".

Quote:
All we can say for sure that whoever is interested in formal research might find it interesting.


It does not require interest in formal research to understand "can fill", "cannot partition", "without seki".

Quote:
Research for the sake of research? Or what are we talking about?


Research for the sake of a) research and b) application.

Quote:
Something tells me Kageyama would turn in his grave if he knew you use his name in this context...


Read his Lessons again. He would be happy!

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 Post subject: Re: Nakade
Post #34 Posted: Sun Sep 08, 2013 2:05 am 
Oza
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RobertJasiek wrote:
Defender's aim: almost-fill.
Attacker's aim: prevent the defender from almost-filling.
The opposite of either aim is the other's aim.

Funny, in my mind, what you are calling the defender is what I would call the attacker.

In any case, since "can necessarily" is awkward to the point of being confusing (the uncertainty implied in "can" stands in apparent contrast to the necessity expressed in "necessarily"), I would suggest "the defender moving first can force all but one of the intersections of the region to be filled..." or perhaps "If the defender moves first, the attacker cannot prevent him from filling all but one of the intersections of the region..."

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 Post subject: Re: Nakade
Post #35 Posted: Sun Sep 08, 2013 2:39 am 
Judan

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In a life and death situation about one group, the 'defender' is the defender of the life of the group.

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 Post subject: Re: Nakade
Post #36 Posted: Sun Sep 08, 2013 2:50 am 
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Quote:
However, as a follower of Kageyama, I believe in the power of the fundamentals.


RJ likes to quote Kageyama but I think it's based on a misconception: the use of the word 'Fundamentals' in the English title. This is from James Davies. The Japanese title means "Amateurs and Professionals" and, as far as I can recall, Kage doesn't use the word 'fundamentals' in his book at all. I think his main theme was about players reaching certain plateaus at which they get stuck and he suggested ways to get unstuck. But the plateaus included fairly high ones (shodan?), which hardly count as fundamental, and in neither the process of reaching the plateaus nor the breakthrough process does Kageyama use anything remotely like RJ's proposals - or am I having a senior morning?

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Post #37 Posted: Sun Sep 08, 2013 3:18 am 
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How, in a Japanese edition, does the Kageyama read in texts similar to "What really turned me from ama to pro was a firm grip of the fundamentals?"?

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 Post subject: Re: Nakade
Post #38 Posted: Sun Sep 08, 2013 5:08 am 
Oza
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Quote:
Defender's aim: almost-fill.
Quote:
In a life and death situation about one group, the 'defender' is the defender of the life of the group.


Not trying to be intentionally stupid, but in the following diagram, both the black group and the marked white stone are groups wanting to stay alive, but it is the white stone that is in the process of almost filling, and he seems to be the one doing the attacking, is he not?
Click Here To Show Diagram Code
[go]$$B
$$ +-------------------+
$$ | . Q . X O . . . . |
$$ | . . X X O . . . . |
$$ | X X X O . O , . . |
$$ | O O O O . . . . . |
$$ | . . . . , . . . . |
$$ | . . . . . . . . . |
$$ | . . , . . . , . . |
$$ | . . . . . . . . . |
$$ | . . . . . . . . . |
$$ +-------------------+[/go]

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 Post subject: Re: Nakade
Post #39 Posted: Sun Sep 08, 2013 5:46 am 
Judan

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Click Here To Show Diagram Code
[go]$$B
$$ +-------------------+
$$ | C W C X O . . . . |
$$ | C C X X O . . . . |
$$ | X X X O . O , . . |
$$ | O O O O . . . . . |
$$ | . . . . , . . . . |
$$ | . . . . . . . . . |
$$ | . . , . . . , . . |
$$ | . . . . . . . . . |
$$ | . . . . . . . . . |
$$ +-------------------+[/go]


When the status of the black group is considered, Black is the defender and can almost-fill, but cannot partition the marked region. (Nakade for the black group.)

Click Here To Show Diagram Code
[go]$$B
$$ +-------------------+
$$ | C W C B O . . . . |
$$ | C C B B O . . . . |
$$ | B B B O . O , . . |
$$ | O O O O . . . . . |
$$ | . . . . , . . . . |
$$ | . . . . . . . . . |
$$ | . . , . . . , . . |
$$ | . . . . . . . . . |
$$ | . . . . . . . . . |
$$ +-------------------+[/go]


When the status of the white group is considered, White is the defender and can almost-fill and can partition the marked region. (This part of the eyespace of the white group is not a nakade for the white group.)

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 Post subject: Re: Nakade
Post #40 Posted: Sun Sep 08, 2013 9:07 am 
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RobertJasiek wrote:
How, in a Japanese edition, does the Kageyama read in texts similar to "What really turned me from ama to pro was a firm grip of the fundamentals?"?

Where to find in the English edition ???

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