Joseki-related life-and-death example 5

    Keywords: Joseki, Life & Death
[Diagram]

White has invaded at the 3-3 point with W1 and Black has blocked with B2. How should White play next?



Here's the correct move:

[Diagram]



Here is one sequence for white to live unconditionally:

[Diagram]

After W5, a and b are miai for life.

Here's another possibility:

[Diagram]

Again White lives.

Bad shape

What if White plays this way?

[Diagram]

Bad shape

W3 is bad shape, as ...

Black answers with 4 and, depending on White's response, White dies or, at best, gets a ko. Here are two cases where White dies, followed by the ko case:

[Diagram]

...B4 is too good shape for Black (hane at the head of two) tderz
Locally White can't make two eyes but the aji of the clamp at a remains.
However, it is painful for White to have to rely on this aji.

[Diagram]

White has a basic dead shape.

[Diagram]

White gets a ko

One last example:

[Diagram]

If the white+square, black+square exchange has taken place earlier then B4 loses its power and W3 is possible.



Variation for Black

What if Black plays this way?

[Diagram]



This is one correct sequence for White:

[Diagram]



But suppose Black persists at black+square?

[Diagram]



Here is a clever sequence which lets White escape to the outside or else capture two stones:

[Diagram]



What if Black ataris on the inside instead of playing B6 in the previous diagram?

[Diagram]

After W7 White will capture something to make life.



Suppose Black knows all this and plays B1 below to defend in sente?

[Diagram]

W2 makes life and later the clamp at a is not small.


Author

Bob McGuigan


This is a copy of the living page "Joseki-related life-and-death example 5" at Sensei's Library.
(OC) 2014 the Authors, published under the OpenContent License V1.0.
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