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Post #101 Posted: Mon Mar 23, 2015 2:29 am 
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Amelia wrote:
I see why 13 is bad. But the problem here is that I find 12 confusing.
It appeared a couple of times in high handicap games and I played O4 or N4. I got no specific comments about those moves so I assume it's fine.
Hi Amelia,
In reply to :w12: , :black: o4 1-space jump is fine.
:black: N4 2-space jump can be OK (but maybe not).
:b13: at R6 armpit hit is not good.

For :black: R6 and :black: N4, it's not so easy to explain their problems.
But let's try a little bit (below).

A few possibilities why your reviewers didn't comment on moves like :b13: or :black: N4:
  • They knew it's a problem, but decided not to comment.
  • They thought there are much bigger mistakes.
  • They didn't know what to say or how to explain it.
  • They were not sure.
  • They saw no problems with those moves.

You see, :w12: at Q7 is "far" (2 spaces) from your corner star point :b3: .
It's also 2 spaces away from your :b5: .
So :w12: has little pressure on either :b3: or :b5: .
The 1-space jump, :black: o4, is a calm and reasonable reply.

The 2-space jump to N4 is also very calm.
And we cannot say it's bad. Maybe in 100 years,
it'll be as common and popular as o4. Who knows.
But we do know the 2-space jump (4th line) is thinner than o4.
It's not easy to "explain" this thinness --
you need some experience with this shape to start to understand its strengths and weaknesses.
Amelia wrote:
I'm mapping out 4th line territory, nothing to complain about I guess, but are there other good options?
With :b13: at R6, the armpit hit, actually there are things to complain about. :)
You see, :w12: jumps in between your :b3: and :b5: --
so as soon as :w12: gets there, it's being pincered by your stones.
Locally, it's already under pressure from your :b3: and :b5: .
Locally, you see :w12: is a weak stone, sandwiched between :b3: and :b5: .
In this situation, I like to use an analogy:
:w12: is like a drowning enemy in the ocean,
and your :b3: and :b5: are standing (on a pier), watching :w12: drown by himself.
But if you make contact with him, with a move like R6 armpit hit,
or, a direct contact move like Q6,
I think of it like you sending another person
to jump into the water to "fight" with the drowning :w12: .
This is not a good idea. In this situation.
If you don't help him by touching him,
he has nothing to grab onto; he has to deal with it all by himself.
But if you send another person into the water, right next to him,
then suddenly he has a lot more options.
On the board, these options translate to ataris, cuts, etc.
If you don't touch him, it's impossible for him to make an atari (locally).
But as soon as you touch him -- say, :b13: and he replies by blocking at R7 --
notice you lose one liberty on your :b13: immediately --
now he is only 3 moves away from an atari on :b13:

In other words, with :b13: - :white: R7,
you make W stronger -- W gains 1 liberty, from 4 to 5.
And your :b13: becomes weaker -- you lose 1 liberty, from 4 to 3.

Locally, :black: R5 kosumi is better than R6 --
you still get your territory, but you don't contact :w12: ;
you don't make W stronger, and you don't reduce your own libs.

Both your :b13: at R6 and :black: R5 kosumi are on the 3rd line,
so it's only 3rd line territory, not 4th line as you mentioned.

There are other reasons :b13: is not good.
Is the above similar to your understanding of why :b13: is bad ?

Important caveat: it really depends on the specific situation
whether you want to touch your enemy stones or not.
Don't get trapped by following proverbs blindly.
Proverbs such as: don't touch weak enemy stones -- it's a big trap.

You also didn't lose your game because of :b13: .
This is likely the #1 reason people kept quiet to you on moves like :b13: --
there are much much bigger fishes to fry. :)

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Post #102 Posted: Mon Mar 23, 2015 4:59 am 
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Hi Ed,

when talking about 4th line territory I meant O4 or N4, not R6 as in the game. I do understand, in hindsight, why 13 is bad.

I was wondering if I could find a more severe / better move than O4. From what you're saying I understand there is no effective direct attack against this stone for now because it's high and far from mine, and it's better to stay away for the moment (let it drown).

I need to try this out more. That move irritates me every time it shows up in a game. I don't have a feeling about it yet. (Ah, I remember... that's why I played 17. I wanted to see how he'd answer).

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Post #103 Posted: Mon Mar 23, 2015 5:17 am 
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Amelia wrote:
when talking about 4th line territory I meant O4 or N4
Hi Amelia,

Ah, good it was brought up, so you can elaborate.
N4 or o4 is not 4th line territory ! :)
( Hmm... misunderstandings at these levels. :) )
Amelia wrote:
I understand there is no effective direct attack against this stone for now
It depends what you mean by "direct attack".
As soon as :w12: jumps between your :b3: and :b5: , it's already under attack. :)
Amelia wrote:
I need to try this out more. That move irritates me every time it shows up in a game. I don't have a feeling about it yet.
Yea, you need some more experience with it. A lot more. :)
Amelia wrote:
that's why I played 17. I wanted to see how he'd answer
Ah! Good you brought it up.
Your :b17: and his :w12: are different !
Please see also posts 19,20 of this game review .

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Post #104 Posted: Mon Mar 23, 2015 9:52 am 
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EdLee wrote:
Amelia wrote:
when talking about 4th line territory I meant O4 or N4
Hi Amelia,

Ah, good it was brought up, so you can elaborate.
N4 or o4 is not 4th line territory ! :)
( Hmm... misunderstandings at these levels. :) )

Is that the "4th line is for influence, 3rd line is for territory" talk? Or is it the "that's not anywhere near safe territory yet" talk?

With what purpose would you play O4, if you played it?

EdLee wrote:
Amelia wrote:
that's why I played 17. I wanted to see how he'd answer
Ah! Good you brought it up.
Your :b17: and his :w12: are different !
Please see also posts 19,20 of this game review .

Yes, I'm aware. The approach stone alone makes a huge difference. Also the previous handicap games where I mentioned this move occured where of course different. But it is similar. The way I see it, the only way to develop a good understanding of a position is to experiment with it in many, many different contexts. If you only see one horse in your life, you will only know about one horse. If you encounter many horses, you will at some point understand more about horses in general, which ones you should ride, and which ones you shouldn't. Right?
I found a horse, so now I want to know more about horses. Not only this one horse that I encountered once and might never see again. So I try to find another horse and then I try to ride it. Even if it turns out to be in fact a cow, I'll still learn something valuable :-)

Quote:
there are much much bigger fishes to fry.
Sure. If you want to know, I'm currently in lesson 2 with Kaz and he's trying to teach me when to hane after a tsuke. Because it turns out often I don't when I should. And none of those moves were ever losing moves either, but it's a basic among the basics, something I have to know so I can build on it later. So that's what I'm studying most intensely at the moment. Tsuke, hane. But not always. You've got to know about the crosscut, and when it's bad for your opponent. And how to answer if he does it anyway. (And, and, and...) And then you can play the hane and do it right.
It's going to take a while.

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Post #105 Posted: Mon Mar 23, 2015 10:25 am 
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Amelia wrote:
EdLee wrote:
Amelia wrote:
when talking about 4th line territory I meant O4 or N4
Hi Amelia,

Ah, good it was brought up, so you can elaborate.
N4 or o4 is not 4th line territory ! :)
( Hmm... misunderstandings at these levels. :) )

Is that the "4th line is for influence, 3rd line is for territory" talk? Or is it the "that's not anywhere near safe territory yet" talk?

With what purpose would you play O4, if you played it?


Normally, when one approaches a 4-4 stone with a small-knight's move, part of the aim of the move is to open up the corner to a bigger invasion than is otherwise possible. The aji of the approach stone makes the 3-3 point bigger. When white approaches more distantly, as here, that aji works a lot less well, so having your opponent go in to the corner isn't something to fear: they will get a result that is locally bad.

Given that, one of your goals should be to attack the stone that white just impudently played into black's area of potential. It already will have trouble making a base, because it's can't make a good extension on either side. The one space jump to O4 looks to make the corner stone stronger, and aims at capping to seal or otherwise get white running out as a followup move. It applies more pressure to the white stone than the knight's move, and the solidity of the knight's move in the corner isn't necessary here.

The corner is still open, but as stated, it's not a problem because it will be smaller, and white's group on the outside will come under more severe attack as a result of taking it, since black will build thickness on the outside. The time to think about the corner is once white's group on the outside is relatively safe, at which point the invasion won't harm it. Then black can take gote to claim the corner, plus a lot of the bottom which he built via free moves while attacking.

In a sense, O4 is influence oriented, but it's more direct than that. It's quite clearly aimed at pressuring white's stone, making it difficult to live locally with a good result. Territory might come from it, but the territory is incidental, and white might choose to take the territory under it instead of saving the white stone or group at some point. Black's compensation will be the continuing attack on the original white stone/group or being able to kill it. Obviously, this will favour black in some cases, and white in others, depending on the state of the board when white makes that choice, but this early, it will favour black.

If black just wanted territory, black could play O3, but this is rather slow, meaning that with good play, white would develop faster over the board as a whole, leading to a harder game for black. In general, trying to claim territory directly, particularly early on, is inefficient because it takes too many moves to truly secure it. Efficient territory arises somewhat naturally through the process of fighting.


Last edited by skydyr on Mon Mar 23, 2015 1:57 pm, edited 1 time in total.
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Post #106 Posted: Mon Mar 23, 2015 1:05 pm 
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Amelia wrote:
It's going to take a while.
This.
Your question about o4 also falls into this category. There are, for all practical purposes, infinite variations, even just locally, after the 1-space jump to o4.

Any basic joseki dictionary may have a few pages (or more) about o4.
Think about the corner life-and-death variations after o4,
how many books (not pages) can they fill ? 1,000 at least ?

To try to gloss over this immense amount of knowledge into merely a word or two (say, influence vs. territory) is a huge trap to me.
Or even a sentence or two.
Or a paragraph or two.
Or a page or two.

Over the years, people around these levels would sometimes ask what's the difference between the 3rd line and the 4th line.
As an illustration, I would point out that the komoku plus the 4-4 constitute a few hundred pages in a basic joseki dictionary. And that the komoku is usually a little longer (about 100 pages longer) than the 4-4.

It's great you're studying the basics.

I think studying, reviews, actual combat experience, and tsumego, etc. are very helpful. They help answer your questions like o4. :)
Amelia wrote:
The way I see it, the only way to develop a good understanding of a position is to experiment with it in many, many different contexts.
Yes.

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Post #107 Posted: Mon Mar 23, 2015 1:28 pm 
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Ok.
@skydyr: I think I'm beginning to understand the general idea. Kinda. There is a lot of subtlety involved in the details of carrying all this out that I'm not grasping yet, a lot of missing pieces. But I'm storing that new piece of knowledge away for future experiments.

EdLee wrote:
I think studying, reviews, actual combat experience, and tsumego, etc. are very helpful. They help answer your questions like o4.
I get it. No shortcuts. My teacher agrees with you :mrgreen:

Thanks to both of you for helping me with this. It was worth losing this game :)

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Post #108 Posted: Mon Mar 23, 2015 1:33 pm 
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Amelia wrote:
No shortcuts.
Bingo! :clap:

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Post #109 Posted: Mon Mar 23, 2015 11:51 pm 
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Quote:
:b97: this is truly bizarre. Can you find a better local move ? :-)


Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ . . . . . . . . . . |
$$ . . 5 2 1 X . . . . |
$$ . . X 3 O X . . . . |
$$ X X O . 4 . X . . . |
$$ . O O . O . . X . . |
$$ O X . . . . X . . . |
$$ O . . . . O . . O . |
$$ . X . . . . O . . . |
$$ . . . . . . . . . . |[/go]

This seems best.
(I considered briefly this move in game but dismissed it without reading properly )

Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ . . . . 3 . . . . . |
$$ . . . 1 2 X . . . . |
$$ . . X . O X . . . . |
$$ X X O . . . X . . . |
$$ . O O . O . . X . . |
$$ O X . . . . X . . . |
$$ O . . . . O . . O . |
$$ . X . . . . O . . . |
$$ . . . . . . . . . . |[/go]

This connection works too but it leaves less points for black and more sente threats for white. (For some reason, I didn't consider this at all during the game).

Quote:
:black: 103 another very strange move. Can you find a better local move ?


Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ . . X . . . . . . . |
$$ . . . . . X . . . . |
$$ . . X . O X . 2 b a |
$$ X X O . . . X . 1 O |
$$ . O O . O . . X . 3 |
$$ O X . . . . X . . . |
$$ O . . . . O . . O . |
$$ . X . . . . O . . . |
$$ . . . . . . . . . . |[/go]

White a and b don't work, white can't live inside.

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Post #110 Posted: Tue Mar 24, 2015 2:07 am 
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Amelia wrote:
Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ . . . . . . . . . . |
$$ . . 5 2 1 X . . . . |
$$ . . X 3 O X . . . . |
$$ X X O . 4 . X . . . |
$$ . O O . O . . X . . |
$$ O X . . . . X . . . |
$$ O . . . . O . . O . |
$$ . X . . . . O . . . |
$$ . . . . . . . . . . |[/go]
Yes -- the turn :b1: is very natural.
Is :w2: correct ?
Is :b3: correct ?
Is :b5: correct ?

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Post #111 Posted: Tue Mar 24, 2015 2:11 am 
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Amelia wrote:
Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ . . X . . . . . . . |
$$ . . . . . X . . . . |
$$ . . X . O X . 2 b a |
$$ X X O . . . X . 1 O |
$$ . O O . O . . X . 3 |
$$ O X . . . . X . . . |
$$ O . . . . O . . O . |
$$ . X . . . . O . . . |
$$ . . . . . . . . . . |[/go]
White a and b don't work, white can't live inside.
Correct.

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Post #112 Posted: Tue Mar 24, 2015 7:39 am 
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I'm a bit late but...

tentano wrote:
Some comments, hope they're helpful.
[...]
:b33: Q6 seems far worse for white, to me. There's also a cut at P9 whichnbeither side seems to have cared about.
[...]


It seems w can even cut at Q7. It may look strange at the first glance, however:

Click Here To Show Diagram Code
[go]$$Bcm33 W has 3 liberties against 2
$$.............O..|
$$................|
$$..............7.|
$$............XX6.|
$$..........XXOO4.|
$$..........OO135.|
$$...........X2...|
$$...........XOOO.|
$$............XXXO|
$$...........X..O.|
$$................|
$$................|
$$-----------------[/go]


Anyway, even if w blocks at :b35: at least the two w stones on O7/P7 will be immediately cut off.

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Post #113 Posted: Tue Mar 24, 2015 1:15 pm 
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EdLee wrote:
Amelia wrote:
Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ . . . . . . . . . . |
$$ . . 5 2 1 X . . . . |
$$ . . X 3 O X . . . . |
$$ X X O . 4 . X . . . |
$$ . O O . O . . X . . |
$$ O X . . . . X . . . |
$$ O . . . . O . . O . |
$$ . X . . . . O . . . |
$$ . . . . . . . . . . |[/go]
Yes -- the turn :b1: is very natural.
Is :w2: correct ?
Is :b3: correct ?
Is :b5: correct ?


Well, let's take this in reverse order. And I'm expending the diagram a bit because those other surrounding stones are going to be relevant to the discussion. (The black stone at L12 also disappeared because I just realised I played it at move 99, so it wasn't there yet when I played at 97 :oops: Need to pay more attention.).

If :b5: is omitted it looks like white stays dead anyway.
White potential follow-ups I considered:


Click Here To Show Diagram Code
[go]$$B
$$ ----------------------------
$$ . . . . . . . . . . . . . . |
$$ . . . . . b a 2 1 X . . . . |
$$ . O . X . c X 3 O X . . . . |
$$ . . . . X X O . 4 . X . . . |
$$ . O . X . O O . O . . X . . |
$$ . . . . O X . . . . X . . . |
$$ . O . . O . . . . O . . O . |
$$ O . . . . . . . . . O . . . |
$$ . . . . . . . . . . . . . . |[/go]


I couldn't find a sequence allowing white to escape. So unless I missed something, :b5: is unnecessary and therefore a bad move.
(It does look like there's some aji left with fun endgame consequences, though, depending on how things develop on the other side of that black group. But too many possibilities for me to evaluate).

Now, :b3:. Black can't tenuki here, otherwise the connection is broken and nasty things happen. But there might be better moves to maintain the connection. I had a look at a and b here.

Click Here To Show Diagram Code
[go]$$B
$$ ----------------------------
$$ . . . . . . . . . . . . . . |
$$ . . . . . . . 2 1 X . . . . |
$$ . O . X . . X . O X . . . . |
$$ . . . . X X O b a . X . . . |
$$ . O . X . O O . O . . X . . |
$$ . . . . O X . . . . X . . . |
$$ . O . . O . . . . O . . O . |
$$ O . . . . . . . . . O . . . |
$$ . . . . . . . . . . . . . . |[/go]


In both cases, if white resists (which I'm not assuming is a good idea, by the way :-p) we end up with this:

Now one move I would be looking carefully at if I were white is a.

Click Here To Show Diagram Code
[go]$$B
$$ ----------------------------
$$ . . . . . . . . . . . . . . |
$$ . . . . . . a O X X . . . . |
$$ . O . X . . X O O X . . . . |
$$ . . . . X X O X X . X . . . |
$$ . O . X . O O . O . . X . . |
$$ . . . . O X . . . . X . . . |
$$ . O . . O . . . . O . . O . |
$$ O . . . . . . . . . O . . . |
$$ . . . . . . . . . . . . . . |[/go]


And then... what? White a? White b? Here too, it seems that as long as black blocks the escape route at c and doesn't forget counting the liberties along the way, it'll be fine. But the day where I can actually read and feel confident about that before playing :b1: in the first diagram, I'll feel quite happy about myself...

Click Here To Show Diagram Code
[go]$$W
$$ ----------------------------
$$ . . . . . . . . . . . . . . |
$$ . . . c b a 1 O X X . . . . |
$$ . O . X . 2 X O O X . . . . |
$$ . . . . X X O X X . X . . . |
$$ . O . X . O O . O . . X . . |
$$ . . . . O X . . . . X . . . |
$$ . O . . O . . . . O . . O . |
$$ O . . . . . . . . . O . . . |
$$ . . . . . . . . . . . . . . |[/go]


Anyway, :b3: as in the first diagram doesn't seem to be the best move, although it certainly feels safer.

Option 1:
Click Here To Show Diagram Code
[go]$$B
$$ ----------------------------
$$ . . . . . . . . . . . . . . |
$$ . . . . . . . 2 1 X . . . . |
$$ . O . X . . X 5 O X . . . . |
$$ . . . . X X O 4 3 . X . . . |
$$ . O . X . O O . O . . X . . |
$$ . . . . O X . . . . X . . . |
$$ . O . . O . . . . O . . O . |
$$ O . . . . . . . . . O . . . |
$$ . . . . . . . . . . . . . . |[/go]


Option 2:
Click Here To Show Diagram Code
[go]$$B
$$ ----------------------------
$$ . . . . . . . . . . . . . . |
$$ . . . . . . . 2 1 X . . . . |
$$ . O . X . . X 5 O X . . . . |
$$ . . . . X X O 3 4 . X . . . |
$$ . O . X . O O 6 O . . X . . |
$$ . . . . O X . . . . X . . . |
$$ . O . . O . . . . O . . O . |
$$ O . . . . . . . . . O . . . |
$$ . . . . . . . . . . . . . . |[/go]


I'd tend to prefer Option 2 as it's sente.


As for :w2:, it is obviously bad, since it fails. This looks like the way to fix white's shape in sente:

Click Here To Show Diagram Code
[go]$$B
$$ ----------------------------
$$ . . . . . . . . . . . . . . |
$$ . . . . . . . 3 1 X . . . . |
$$ . O . X . . X 2 O X . . . . |
$$ . . . . X X O b a . X . . . |
$$ . O . X . O O . O . . X . . |
$$ . . . . O X . . . . X . . . |
$$ . O . . O . . . . O . . O . |
$$ O . . . . . . . . . O . . . |
$$ . . . . . . . . . . . . . . |[/go]


There... I hope I didn't overlook anything too obvious :mrgreen:

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Post #114 Posted: Tue Mar 24, 2015 1:27 pm 
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Hi Amelia,

You're right that :b5: was unnecessary.

The rest is the kind of analysis you need to do,
in your reviews, and during your games. Good. :)
Compare to your first diagram in post 109. :)
No shortcuts. It's all work. :mrgreen:

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Post #115 Posted: Wed Mar 25, 2015 12:31 am 
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EdLee wrote:
Compare to your first diagram in post 109. :)
No shortcuts. It's all work. :mrgreen:

Point made :study:

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Post #116 Posted: Wed Mar 25, 2015 3:07 am 
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Amelia wrote:

As for :w2:, it is obviously bad, since it fails. This looks like the way to fix white's shape in sente:

Click Here To Show Diagram Code
[go]$$B
$$ ----------------------------
$$ . . . . . . . . . . . . . . |
$$ . . . . . . . 3 1 X . . . . |
$$ . O . X . . X 2 O X . . . . |
$$ . . . . X X O b a . X . . . |
$$ . O . X . O O . O . . X . . |
$$ . . . . O X . . . . X . . . |
$$ . O . . O . . . . O . . O . |
$$ O . . . . . . . . . O . . . |
$$ . . . . . . . . . . . . . . |[/go]


There... I hope I didn't overlook anything too obvious :mrgreen:


So if the above is white's best continuation locally (actually tenuki probably best until endgame and save 2 for a ko threat later), how do you think that compares to black 1 here?

Click Here To Show Diagram Code
[go]$$B
$$ ----------------------------
$$ . . . . . . . . . . . . . . |
$$ . . . . . . . . . X . . . . |
$$ . O . X . . X 1 O X . . . . |
$$ . . . . X X O . . . X . . . |
$$ . O . X . O O . O . . X . . |
$$ . . . . O X . . . . X . . . |
$$ . O . . O . . . . O . . O . |
$$ O . . . . . . . . . O . . . |
$$ . . . . . . . . . . . . . . |[/go]


(This is a good example of the principle of using your opponent's response to your first idea for your move to find alternative moves for you.)

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 Post subject: Re: Back on track
Post #117 Posted: Thu Mar 26, 2015 12:49 pm 
Lives with ko

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Click Here To Show Diagram Code
[go]$$B
$$ ----------------------------
$$ . . . . . . . . . . . . . . |
$$ . . . . . . . . a X . . . . |
$$ . O . X . . X 1 O X . . . . |
$$ . . . . X X O 2 b . X . . . |
$$ . O . X . O O . O . . X . . |
$$ . . . . O X . . . . X . . . |
$$ . O . . O . . . . O . . O . |
$$ O . . . . . . . . . O . . . |
$$ . . . . . . . . . . . . . . |[/go]


Wow, I would never have looked at this move... But it really works (once you know it's there ^^). If white a, black b. After white 2, black a. White can't cut.

Quote:
This is a good example of the principle of using your opponent's response to your first idea for your move to find alternative moves for you
I'll keep that in mind, thanks!

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Post #118 Posted: Thu Mar 26, 2015 1:08 pm 
Honinbo
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Amelia wrote:
Click Here To Show Diagram Code
[go]$$B
$$ ----------------------------
$$ . . . . . . . . . . . . . . |
$$ . . . . . . . . a X . . . . |
$$ . O . X . . X 1 O X . . . . |
$$ . . . . X X O 2 . . X . . . |
$$ . O . X . O O . O . . X . . |
$$ . . . . O X . . . . X . . . |
$$ . O . . O . . . . O . . O . |
$$ O . . . . . . . . . O . . . |
$$ . . . . . . . . . . . . . . |[/go]
Hi Amelia,

Can you find a move other than :w2: , so that :black: (a) is not atari ?

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 Post subject: Re: Back on track
Post #119 Posted: Fri Apr 03, 2015 11:51 pm 
Lives with ko

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KGS: Soji
DGS: Soji
Online playing schedule: KGS usually Friday 20:00-23:00
I haven't played any go in a week. My bag was stolen last week at the central station.
On top of money, credit cards, IDs, and so on, I lost my laptop with all the data on it, the hand written game records from the tournament, and the two go books I was studying at the moment.
I've been very pissed at the thieves, at myself, and at the world in general this last week. I also have a lot of lost work to redo because some of the data on the laptop wasn't backed up.

I'll try to have my life get back to normal next week...

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 Post subject: Re: Back on track
Post #120 Posted: Sat Apr 04, 2015 12:16 am 
Oza

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That's horrible Amelia, I'm very sorry to hear that. :(

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