Kyu Exercise 211 / Solution

Sub-page of KyuExercise211
[Diagram]

Solution

The descent at W1 makes miai of making the second eye at a and connecting at b. Hence White lives unconditionally.

[Diagram]

Failure

Unlike the position described in two stones on the third line can make an eye, the hane at W1 is wrong. Although White can live by ko with W3 and W5, it is inferior to the unconditional life in the solution.

[Diagram]

Failure

Again this is a ko, but ko is considered a failure in this problem.

[Diagram]

Failure

W3 can also descend, aiming to connect with W7, but B10 can start a throw-in ko. Among all the kos presented, this is probably the best for White because White takes the ko first.

Note: This sequence is the second solution in the original problem, because it is not possible for Black to throw-in at B10 without the black+circle stone.

[Diagram]

Failure

The more usual looking tiger's mouth described in two stones on the third line can make an eye does not work in this case, because the existence of the black+circle stones meant that if W5 cuts after B4, then B6 can capture the W5 stone in a ladder.

[Diagram]

Failure

Connecting with W3 doesn't make an eye either.

[Diagram]

Failure

Make a hane at the other direction with W1 allows B2 and B4 to kill the group unconditionally.


This is a copy of the living page "Kyu Exercise 211 / Solution" at Sensei's Library.
(OC) 2016 the Authors, published under the OpenContent License V1.0.
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