Gokyo Shumyo, Section 1, Problem 2 / Solution

Main line: Hashimoto Utaro
Variations: Dieter

Solution

[Diagram]
Main line  

B1 is the only move. After B1, the points a and b are miai for life.

Related proverb: strange things happen at the one-two point - in this case you need to know which of the two 1-2 points, of course.

[Diagram]
2 and 3 are miai (i)  

Black has two sure eyes at a and b.

[Diagram]
2 and 3 miai (ii)  

If White next blocks at a, Black makes a big eye at b. And if White draws out at b, Black enlarges the eye with a.

NB: if White has a stone on one of the circled points, her move at b suddenly works and Black is dead, although a lot of aji remains, because he can break out into the centre (in this position).

[Diagram]
White's attempt to escape fails  

Grauniad: W1 to W9 followed by B a, W b and B c shows that White cannot escape without an extra stone to right. Thanks to Jasonred for clarifying this.

Failures

[Diagram]
Wrong (i)  

B1 is wrong. After W2, B3 and B5 seem to make the most of it, but when White cuts at W6 it's all over.


[Diagram]
Wrong (ii)  

If Black plays at the other 1-2 point, it is also wrong. B5 and W6 are miai for the kill. After W6, Black can play neither a nor b because of shortage of liberties.


[Diagram]
Wrong (iii)  

B1 here is also wrong. White can even respond at ease to the hanes at B3 and B5, because whatever Black does, the points a and b remain miai for the kill.


[Diagram]
Wrong (iv)  

Finally, what about making the corner eyespace as big as possible, with B1 here? White plays hane at W2, threatening to capture three stones. Black has to make a solid connection. This is as in Gokyo Shumyo, Section 1, Problem 1, but with a white stone at W2, and Black is dead.

[Diagram]
Wrong (iv), Changing B3  

White at a kills the black group with two more white stones.

[Diagram]
Wrong (iv), Changing B3 Refutation  

unkx80: It might be better to have W2 block on the outside.


Back to Gokyo Shumyo Tsumego Series
Go to Problem 3


Gokyo Shumyo, Section 1, Problem 2 / Solution last edited by Unkx80 on January 27, 2010 - 17:56
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