4464 enclosure 3-3 invasion

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  Difficulty: Advanced   Keywords: MiddleGame, Joseki, Question
[Diagram]

Joseki

Jesusin: This is a diagram from the book "Get strong at invading". It is a middle game joseki. There are other possibilities for B4.

The text (answer to problem 107) says White is alive after the sequence.

But I do not seem to find this group alive. Here are my variations:

[Diagram]

Continuation 1, is White alive?

Up to W9 White is dead. If White a next, then Black b.

What am I missing?


Charles Matthews Try W6 at B7, as in Continuation 2, but after playing White b, Black a. Black is short of liberties. If Black is very strong locally it may be possible to kill White after White comes out at W8. For example, the game between Fujisawa Hideyuki and Go Seigen, 1973-11-18.


[Diagram]

Continuation 2, is White alive?

Up to B9 White is dead. If White a next, then Black b.

What am I missing?

Andrew Walkingshaw: What if, instead of a...

[Diagram]

Continuation 2, White makes two eyes

White plays at W1 here, living locally through W5. If, instead, Black tries the play at B2 below:



[Diagram]

Continuation 2c, connect and die (6 at 3)

White can play as shown here, catching the outside stones and making an eye on the edge.


Jesusin: Thank you very much, Charles and Andrew.


[Diagram]

Continuation 2d, White dies

Olo: After B7 white dies. White can live only if have not played W2 before.


[Diagram]

White escapes or lives I

[Diagram]

White escapes or lives II

Hans: White should hold the cut (2 in Continutation 1,2) in reserve. Then white can escape or -if black prevents this- live as shown in the 2 diagrams above.


For the sake of completeness I will show the other variation for B4 in the first diagram:

[Diagram]

Joseki II, part 1

[Diagram]

Joseki II, part 2


Just to make this page complete I would like to bring up a situation from a game between Lee ChangHo? - Yoda Norimoto. This was played in the 2nd Round of the Teda Cup on the 13th June 2004.

[Diagram]

Lee ChangHo? - Yoda Norimoto. 13th June 2004.

[Diagram]

Lee ChangHo? - Yoda Norimoto. 13th June 2004.

I guess if B1 then W2?

[Diagram]

Lee ChangHo? - Yoda Norimoto. 13th June 2004.

If the previous diagram is ok, then why didn't black play it ... because later on in the game white played the following moves. These would not have been possible.


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This is a copy of the living page "4464 enclosure 3-3 invasion" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.
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