Xuanxuan Qijing Problem 341 / Solution

Solution 1

[Diagram]

Main Solution

B1 is the key move that aims at the cut at a and effectively stops white+circle from escaping.

[Diagram]

Continue

White's best try would be W4.

After W4, Black has to fight a ko for life.

[Diagram]

Continue

Black starts the ko with B5 and B7. By playing B9 at B5, black takes the ko first.

[Diagram]

Continue

Black has taken the ko with black+circle, so white has to find the first ko threat. Furthermore, black has two internal ko threats at a and b.



Solution 2

[Diagram]

Another Solution

Black can switch the order of play by starting with B1.

However, Black still can't avoid the ko.




Failure

[Diagram]

B1 here doens't stop white+circle W4 from escaping; White can kill without ko.

[Diagram]

[Diagram]

W2 is the same for B1 at x.

[Diagram]

[Diagram]

Starting with B1 or x is a good way to kill one's own group in gote.


This is a copy of the living page "Xuanxuan Qijing Problem 341 / Solution" at Sensei's Library.
(OC) 2012 the Authors, published under the OpenContent License V1.0.
[Welcome to Sensei's Library!]
StartingPoints
ReferenceSection
About