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PlayKikashiBefore...
KanazawaProblem21

 

Kanazawa Solution 21
Path: KanazawaSolutions   · Prev: KanazawaSolution20   · Next: KanazawaSolution22
   

Authors:

Main line: Hashimoto Utaro, 9p
Variations: BillSpight, DieterVerhofstadt 1k

[Diagram]
Diag.: Main line

White plays kikashi before living with 1, and then occupies the vital point with 3.



BillSpight: The point about kikashi is rather subtle. There is a, well, grosser reason for White to play the hane first. It is actually a kind of probe, getting Black to commit to the connection. If White plays the 2-1 first,

[Diagram]
Diag.: Wrong 1: Approach ko

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]
Diag.: Wrong 2

Assuming White knows the concept of playing kikashi before living, she may still fail to see the vital point. Black 4 makes miai of a and b.



[Diagram]
Diag.: Wrong 3

Here too, White misses the vital point. Black 4 makes miai of a and b.



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