Gokyo Shumyo, Section 1, Problem 46 / Solution

Authors:
Solution diagram: Hashimoto Utaro 9p
Variations: Dieter 1k, unkx80

[Diagram]
White lives  

The play at W1 is the vital point.

[Diagram]
Continuation  

The points a and b are miai now.

[Diagram]
Failure  

After B10, Black can almost fill White's eye space with a bulky five. White can do nothing to prevent that without turning her eye space into another dead shape.

[Diagram]
Failure 2  

xela: What is black's response to W1?

[Diagram]
continuation; B8 at W3  

xela: this is the best I can find so far...

[Diagram]
continuation continuation  

This way, white lives.

[Diagram]
Variation  

I can almost see how black can make a ko, but it looks like white has enough liberties to squeeze... have I missed something here?

[Diagram]
continuation  

(if black tries B1 at 'a' or 'b', white still plays W2)

[Diagram]
continuation  

[Diagram]
Refutation.  

unkx80: Given your W3, the refutation is easy - B4 and B6 turns it into a direct ko.

[Diagram]
Refutation.  

For this W3, Black kills with B4 and B6.

[Diagram]
What about this?  

I was thinking, what about B2 followed by B4?

[Diagram]
What about this?  

For W5, then B6 and B8 kills without ko. If this is the case, then this really improves over your suggested B2.

[Diagram]
What about this?  

But there is this W5. If B6, then W7 becomes sente, so W9 lives.

[Diagram]
What about this?  

If this B6, then W7 and W9 lives too.


There is a short discussion at /Failure.


Back to Kanazawa Tesuji Series
Go to Problem 47


Gokyo Shumyo, Section 1, Problem 46 / Solution last edited by Unkx80 on January 25, 2007 - 16:27
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