Beginner Exercise 110 / Solution

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[Diagram]

Summary

No. Black can't cross the 3x3 gap.

There are many candidate moves so let us concentrate on more difficult ones - a keima, b kosumi and c attach.


a) Keima

[Diagram]

Symmetry point

B1 is defeated by two clamping attachments, W2 and W4. This line works for Black if the marked stone is missing (or results in a throw-in ko at W6 if the marked stone is at a).


b) Kosumi

[Diagram]

Kosumi

B1 tries a kind of "monkey jump on the second line", then White plays the attachment at W2. Next, descending at W4 is key to prevent connection.


c) Attach

[Diagram]

Attach

W2! prevents connection by keeping options on the third line open. After B3, White pushes through the other side with W4.

[Diagram]

Variation

B1 counter-clamp is an interesting try to make ko, but W8 and W10 separates the lower group even if Black wins the ko.


Related problems: Black needs some supporting stones to cross the 3x3 gap. See Xuanxuan Qijing Problem 132 and Gokyo Shumyo, Section 6, Problem 66.



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