Gokyo Shumyo, Section 1, Problem 2 / Solution

Main line: Hashimoto Utaro
Variations: Dieter

Solution

Main line

is the only move. After , 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, 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).

White's attempt to escape fails

Grauniad: to 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

Wrong (i)

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

Wrong (ii)

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

Wrong (iii)

here is also wrong. White can even respond at ease to the hanes at and , 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 here? White plays hane at , 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 , and Black is dead.

Wrong (iv), Changing

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

Wrong (iv), Changing Refutation

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

Back to Gokyo Shumyo Tsumego Series
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Gokyo Shumyo, Section 1, Problem 2 / Solution last edited by grauniad on December 11, 2020 - 07:22
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