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BeginnerExercise15

 

Beginner Exercise 15 Solution
  Difficulty: Beginner   Keywords: Problem

[Diagram]
Seki?

Splice: I can only seem to make White live in seki with W1. Possible continuations:


[Diagram]
Var 1 - Seki

If Black doesn't take B2, White will be able to make two eyes. W3 makes seki. If Black plays inside, White gets a bent four and lives. If White plays inside, he only gets three in a row, and dies. The circled point is the only possible weakness, but Black cannot get it before White connects it.


[Diagram]
Var 2 - White lives

White has two eyes whatever happens.


[Diagram]
Doesn't work?

W1 does not work, because B2 reduces White to one eye.


[Diagram]
Hmmm...

It seems to me that, yup, whatever you do, even giving White five moves in a row, if White doesn't put one of the stones on that circled point and Black takes it, White dies. So, that has to be the first move.


[Diagram]
Seki 1

[Diagram]
Seki 2



Referring to both Seki diagrams:

I think Black can only make it seki.

Black can't kill White with other plays and B2 will make it seki after W3.

If W3 is played elsewhere, Black can play B4 and White is dead. White can answer at the W5 but Black will play B6.(imagine black covers all outside territories with the three black stones inside, the circled point is Black's last move to kill White). If White plays at the marked point, she dies.

So W3 makes the white group alive (without territory) and Black's three stones are alive in diagram Seki 1. After B4, there is no need to continue.




This is a copy of the living page "Beginner Exercise 15 Solution" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.