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Joseki-related life-and-death example 3
Path: JosekiRelatedLifeAndDeath   · Prev: JosekiRelatedLifeAndDeathExample2   · Next: JosekiRelatedLifeAndDeathExample4
  Difficulty: Intermediate   Keywords: Life & Death

The following situation can arise from a 3-3 invasion.


[Diagram]
Invasion

White has lived in the corner.



[Diagram]
Later...

Klaus: I think I read that the following continuation is supposed to be some kind of usual exchange later. (Might be wrong though.)



In the game in question, White decided to play tenuki after B3, in order not to end in gote if Black decides not to play B9 in the upper diagram. How should Black continue?

[Diagram]
Status?

Charles A well-known position: can become ko.

Klaus: Could you please show us the ko sequence? I can't find it myself, and I don't know where to look it up. (And I guess, others might have the same problem...)

Charles You could try Go Tools. But why not try to solve the problem? Bob has provided an answer below.



At learning from Takemiya the following reduction was mentioned. White is left with barely two eyes, but can Black do better?

[Diagram]
Reduction



At PositionalJudgementProblem2Discussion it was suggested, that Black cam kill by playing hane underneath. But is that right? On that page, a move at a is suggested, but White seems to die after b.

[Diagram]
Kill?

[Diagram]
What about this?

White W2 is a different idea.But is it enough? (No, see below.)


[Diagram]
(1) Not killing

Playing B3 here can lead to the mentioned reduction, if Black continues with B5 at a. Other moves seem to fail. What alternatives are there for B3? Is White alive?


[Diagram]
(2) Not killing either


[Diagram]
Hane both sides?

SnotNose: How does White respond to B3?

Klaus: The "Double Hane" seems to kill, cool idea!



However, I'm still not completely convinced. I want to present an idea I found at oki wants tobi?:

[Diagram]
Different ikken tobi



White seems to be alive here, but of course, Black kan play B3 differently in this case. He might try the vital point, but...

[Diagram]
Alive?



... the sequence a, b, c, d won't kill White, and beginning with will be answered at a. so how is White killed?


BobMcGuigan: Here are some important sequences in this position:

[Diagram]
Ko



[Diagram]
White dies


MK I think this page should be renamed and a path for complicated but often-arising tsumego positions like this created.

unkx80: I have created the path joseki related life and death, hopefully this helps a little bit. Hopefully others can add to it too. =)



Path: JosekiRelatedLifeAndDeath   · Prev: JosekiRelatedLifeAndDeathExample2   · Next: JosekiRelatedLifeAndDeathExample4
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