Xuanxuan Qijing Problem 166 / Solution



Solution

XuanxuanQijingProblem166/Solution#toc2 XuanxuanQijingProblem166/Solution#toc3 XuanxuanQijingProblem166/Solution#toc4
[Diagram]

Solution

a,b,and c are the stronger responses to W1.

Resistance 'a'

[Diagram]

If W1 W3 escapes, the remaining space isn't enough to create a seki.

[Diagram]

continue

W7 captures the black stones by snapback.

Resistance 'b'

[Diagram]

After W3, Black can't get both x and y

Resistance 'c'

[Diagram]

After W5, White has x to escape or y to capture some black stones by snapback.

Capturing W5 W1 with B6 only delays the problem; W7 at W5 is good enough.

The purpose of B4 is to prevent the white chain with W3 from escaping. If B4 at x, W5 still works.




Failure

[Diagram]

Compare with Resistance 'c' the extra stone at B6 allows Black to fight a ko.

[Diagram]

Black captures everything.

[Diagram]

[Diagram]

For other W1, B2 suffices.


See also a simpler variant at Xuanxuan Qijing Problem 112.


This is a copy of the living page "Xuanxuan Qijing Problem 166 / Solution" at Sensei's Library.
(OC) 2011 the Authors, published under the OpenContent License V1.0.
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