Gokyo Shumyo, Section 1, Problem 21 / Solution

Main line

[Diagram]
Main line  

White must force Black to connect with W1 first, and then occupy the vital point with 3.


Failure

[Diagram]
Mistake at 1  

If White plays the 2-1 first, Black makes an approach ko for the life of the group. Before winning the ko, Black has to connect the marked stones. Playing a provides three local ko threats for White.
(Note: While Black's ko threats have to be huge to win the ko, Black can show a profit if the threat that White ignores is large by comparison with giving up the two marked stones.)


[Diagram]
Mistake at 3  

W3 here fails to see the vital point. B4 makes miai of a and b.


[Diagram]
Mistake (ii) at 3  

Here too, White misses the vital point. B4 makes miai of a and b.


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Gokyo Shumyo, Section 1, Problem 21 / Solution last edited by ao on June 3, 2017 - 22:52
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