Gokyo Shumyo, Section 1, Problem 2 / Solution

Main line: Hashimoto Utaro
Variations: Dieter


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.

2 and 3 are miai (i)  

Black has two sure eyes at a and b.

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, or at a, her move at b suddenly works and Black is dead.

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.


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.

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.

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.

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.

Wrong (iv), Changing B3  

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

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 Malcolm on January 7, 2022 - 10:21
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