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KanazawaProblem21

 

Kanazawa Problem 21 / Solution
Sub-page of KanazawaProblem21

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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This is a copy of the living page "Kanazawa Problem 21 / Solution" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.