Gokyo Shumyo, Section 1, Problem 9 / Solution

[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  

White should play W1. When B2 atari, W3 captures, and B4 captures...

[Diagram]
Continuation  

White can recapture at W5, and has two eyes at a and b.

[Diagram]
Alternative follow-up  

The tesuji at W1 works too.

[Diagram]
Continuation  

After W5, it just transposes back to the previous solution.


[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.


[Diagram]
White to live  

ProtoDeuteric: Does this work?

unkx80: W3 should play at W5 for life, and B4 should play at W5 to kill with a bulky five.


[Diagram]
 

go student: What about this. There should be at least a ko, as I can see. Please tell me if I miss something

B2 atari at a or B4 connect at W5 below are clean kills

[Diagram]
 

Back to Gokyo Shumyo Tsumego Series
Problem 10


Gokyo Shumyo, Section 1, Problem 9 / Solution last edited by Slarty on June 25, 2013 - 04:57
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