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KanazawaProblem9

 

Kanazawa Problem 9 / Solution
Sub-page of KanazawaProblem9

[Diagram]
White to live

W1 prevents the capture of two stones and makes shape. She has to be careful in answering B2 and B4.


[Diagram]
Follow-up

The throw in at W1 is tesuji. White can't block at a with W5 because of shortage of liberties, but captures at W1 instead.

JamesA: Is it necessary to throw in? Can White just play at W3 straight away?

unkx80: Both will lead to the same result.


[Diagram]
Continuation

After Black's capture of two stones with B2, White can recapture at W3, and has two eyes at a and b.



[Diagram]
Mistake in the follow-up

If instead of throwing in, White blocks at W1, B2 starts a ko.



[Diagram]
Wrong

W1 on the 2-2 point doesn't give life. After the connection at B6, White still has only one eye in the corner. Black can also play atari with B2 at B4.


[Diagram]
Wrong (ii)

Connecting at W1 is the third way to save the two stones. Black plays hane at B2 and makes a placement at B4 - and White is dead, because now a and b are miai. Black could also kill by playing B2 on the vital point of this shape, namely W3.



Problem 10
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This is a copy of the living page "Kanazawa Problem 9 / Solution" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.