Gokyo Shumyo, Section 1, Problem 97 / Attempts

unkx80: I find this a difficult problem.

Dieter: Me too, unkx80.

[Diagram]

Analysis

a is an half-eye, but if the white+circle stones get captured, then a becomes a full eye.

[Diagram]

Attempt

Dieter: W4 doesn't look necessary here, but it is [1]:

[Diagram]

Variation I

[Diagram]

Variation II

[Diagram]

Variation III

[Diagram]

Var iv

Dieter: Up 'till B5 is part of the solution. The next move to think about is the astute W6.

[Diagram]

Var iv

unkx80: Looks like there are a few ways of solving this. One which looks nicer might be this.

[Diagram]

Var iv

Dieter: Yes. I now understand why that white stone on the upper left komoku is in place. But let's leave it here. You are a quick thinker unkx80.

unkx80: Which komoku is it?


[1]

[Diagram]

White 4 necessary


[Diagram]

Failure

Bill: For a while I thought that B1 was a good move. ;-) I missed W4, which I now think is correct.

[Diagram]

Failure (ii)

One point is that, thanks to white+circle, White can afford to play W4 here.


[Diagram]

Extended problem


[Diagram]

My solution?

[Diagram]

continuation


This is a copy of the living page "Gokyo Shumyo, Section 1, Problem 97 / Attempts" at Sensei's Library.
(OC) 2011 the Authors, published under the OpenContent License V1.0.
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