Gokyo Shumyo, Section 1, Problem 14 / Solution

Authors:
Main line: Hashimoto Utaro 9p
Variations: unkx80 1d*, Dieter Verhofstadt 1k

[Diagram]

Main line

Black starts by pushing out at B1. Escaping to the center is considered success, so White blocks at W2.



The whole thing is a set-up to get the hane of B3 in place, before playing the connection of B5. After B9, the vital point, Black has two eyes.

[Diagram]

Variation 1 : mistake at 7

The awkward move in this sequence is B7. Suppose Black captures at B1 instead. After W2, he needs three moves to remove it, and White can create shortage of liberties at W4.


[Diagram]

Variation 2: Omitting the push and hane

If Black omits the push and hane (B1 and B3 in the main line), and plays at B1, White plays hane at W2. W4 keeps Black to one eye. Even if Black captures the white stones W2 and W4, he will only get a False Eye.


[Diagram]

Variation 3: Omitting the push

Starting with the hane at B1 in variation 3 works as well, but W2 can defend at a instead of d. Compare this with the sequence Black a, White b, B1, and Black loses the possibility of cutting at c.


Problem 15
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