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How deal with this invasion at extension? =/
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Author:  DiogoBarbosa [ Mon Mar 07, 2016 8:09 pm ]
Post subject:  How deal with this invasion at extension? =/
Hello, everybody.
Please, I would like to know, how deal with this invasion at my extension from two stone wall.

I could swear that the kosumi would kill him =/
What is the correct flow of game, to a invasion like this with support arround? What I need to think and see?

Thank you very much, and a good week for all.
Author:  Solomon [ Mon Mar 07, 2016 8:49 pm ]
Post subject:  Re: How deal with this invasion at extension? =/
You are not strong in that area, so L4 is too much. M4 allows you to gain thickness, while giving W the bottom. You may also consider probing with Q4 first to see how W responds, as suggested in Think Like a Pro: Haengma in one of the haengma variations. You might also find this page on 3-space invasions helpful.
Author:  EdLee [ Tue Mar 08, 2016 1:04 am ]
Post subject: 
Quote:
I could swear that the kosumi would kill him =/
Good to learn something new, isn't it.
Quote:
What I need to think and see?
When W approaches H3, if you reply with a jump to K5, then your shape is stronger.
Author:  PlaySlow [ Tue Mar 08, 2016 8:53 am ]
Post subject:  Re: How deal with this invasion at extension? =/
https://www.youtube.com/watch?v=Mo2x__IQAtU In this link a AGA 7 dan player explains why this extension is not played anymore. It seems that even if you add 1 more stone to it, it can be invadeable.

From Attack and Defense book i can say that you should play
*L4 if you are strong around.
*M4 if you are neither too strong or too weak at around. %90 of the time.
*M2 if you are very weak around. For example imagine 2 more white stones at K5 and N6.

Of course there are continuations to read, those are only first moves:)
Author:  ez4u [ Tue Mar 08, 2016 4:27 pm ]
Post subject:  Re: How deal with this invasion at extension? =/
The video is not one of Yunxuan's better efforts IMHO. What he covers is interesting but misleading because he fails to research the situation properly. The three space extension is still a common joseki, including in the specific position that he used in the video. Needless to say, no pro has ever simply jumped to 7 below in response to the marked stone (at least I can say the position in the video does not appear in GoGoD :) ). The standard follow up is the immediate approach at 1 instead, disrupting Black's potential framework at the top. If Black continues with the immediate shoulder hit, White plays around the outside and is untroubled.
Click Here To Show Diagram Code
[go]$$Wc Pak Chin-sol - Pak Cheong-hwan, 2nd Let's Run Park Cup, 2015-10-22
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . . . X . . . . . . . . |
$$ | . . . O . . . . . , . . . . 1 , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . 0 . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . B . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . 7 3 O 6 . |
$$ | . . . . . . . . . . . . . . 5 2 4 . . |
$$ | . . . . . . . . . . . . . . . . . 8 . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . O O . . |
$$ | . . . . . . . . . . . . 9 . . O X . . |
$$ | . . . O . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . X . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Overall the three-space extension is fine as long as you have realistic expectations for what it achieves.
Author:  DiogoBarbosa [ Tue Mar 08, 2016 5:59 pm ]
Post subject:  Re: How deal with this invasion at extension? =/
Thank you very much!!!
I read all commentaries, and now I will read each one again very slowly to understand and make exercises.

Thank you again!
Author:  PlaySlow [ Wed Mar 09, 2016 12:43 am ]
Post subject:  Re: How deal with this invasion at extension? =/
Thank you for your explanation ez4u:)
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