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BeginnerExercise30

 

Beginner Exercise 30 Solution
   

This one is hard - I was going to request hints for this one! lavalyn

Preamble:

[Diagram]
Diag.: Time is of the essence

The marked Black stones have only two turns of aji left in them - the first move is nearly certain to be ate.


[Diagram]
Diag.: Variation a fails

After this sequence up to White 4, Black needs at least three turns to capture the eye - because strange things happen in the corner?. Black must first connect before taking the corner liberty - and by then it's too late.


[Diagram]
Diag.: Variation b fails

Black now needs at least 5 turns to kill White - she could tenuki here without worry. Black 3 dies in gote.


[Diagram]
Diag.: Variation c - Success

The only sequence. A Black win of this ko captures first the marked White stone, followed by the rest of the group. Notice that White captures first - but it's better than death. Question - so this is a two step ko?

unkx80: Yes, this is a two step ko. This is also the solution. If white 2 plays at 3, black will catch all the white stones in a snapback at a.


[Diagram]
Diag.: Variation d - Failure

Like Variation a, Black needs three turns in this variation, and dies in a similar fashion.





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