Gokyo Shumyo, Section 1, Problem 36 / Solution

[Diagram]
Black lives  

B1 makes miai of a and b. At the same time, it protects against a placement at c. The shape composed here, recurs in problems 18 and 34. I'll call it the oki wants ikken tobi for now.

[Diagram]
Main line  

White makes a placement at W2, but Black calmly takes the miai point at B3. White seemingly connects underneath, but Black has the throw in tesuji at B7. White captures, next ..

[Diagram]
Main line (continuation)  

White is in shortage of liberties. Look how black+circle helps.


[Diagram]
Wrong (1)  

If B1 here, then White plays at W2, threathening to connect at a.

[Diagram]
Wrong (1)  

Note that W2 must not be played here! Then B3 and B5 lives, after sacrificing the two Black stones on the right. Of course, if B3 makes the mistake of playing at W4 to save the two stones, White plays the placement at B3 and Black loses everything instead.

[Diagram]
Wrong (1)  

Black's strongest play is at B1, threatening to make an eye in the corner. If W2 plays at a, Black can make a nasty ko at b.

[Diagram]
Sub-diagram (1)  

ChrisR: How does Black continue? Seems Black's group is dead.

[Diagram]
Wrong (1)  

B1 to B5 attempts to create a seki. However, W6 is a tesuji that will kill Black.

[Diagram]
Wrong (1)  

B1 and B3 try to make a bent four.

[Diagram]
Wrong (1)  

But the placement at W1 kills the entire black group. If W1 carelessly plays atari on the five black stones at a, Black lives at W1 instead, with the under the stones technique.

KarlKnechtel: For completeness, note Black cannot live via under the stones by sacrificing six stones either:

[Diagram]
Wrong (1)  

White is forced to capture at W3 (!) because otherwise Black captures at a and has two eyes. Black tries to continue via standard under the stones technique, but ends up almost filled with a dead shape (there is no need to force the issue with a play at a because of this filling):

[Diagram]
Wrong (1)  

Problem 37
Back to Kanazawa Tesuji Series


Gokyo Shumyo, Section 1, Problem 36 / Solution last edited by 68.226.209.57 on June 1, 2009 - 01:16
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