Gokyo Shumyo, Section 1, Problem 70 / Solution

Main line: Hashimoto Utaro
Variations: Bill Spight, Dieter

[Diagram]
Main line  

White plays on the leg side, on the second line. White lives up to W7. If next Black a...

White can play atari at W4 and Black can't connect at white+circle (oshitsubushi).


[Diagram]
Failure 1  

Bending in from the side without the leg leads to ko. If Black wins the ko, he almost fills White's eyespace with a bulky five. The points a and b are miai for that purpose, and thus serve as a ko-threat for White:

[Diagram]
White'slocal ko threat  

W1 is a ko threat. If B2 fills the ko, W2 makes seki.


[Diagram]
Failure 2  

This is problematic:

[Diagram]
Failure 2 - continuation  

If Black plays a, White captures to make a living big eye. If not, White makes seki at a. Let's discuss this at /Discussion.

[Diagram]
Variation  
[Diagram]
Variation  

White must win the ko to be able to approach at a.


Go to Problem 71
Back to Kanazawa Tesuji Series


Gokyo Shumyo, Section 1, Problem 70 / Solution last edited by CharlesMatthews on June 25, 2003 - 12:44
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