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BeginnerExercise28

 

Beginner Exercise 28 Solution
   

An uncertain solution by lavalyn:

unkx80: My goodness, your solution came only 15 minutes after I posted the problem! And it's 100% correct. =)

[Diagram]
Diag.: Ko for life - Black captures first, 1 and 3 could be interchanged?

The sequence from 1 to 4 yields a ko for life. Black cannot connect without removing the white stones because of damezumari.

unkx80: Yes, 1 and 3 can be interchanged. =)

[Diagram]
Diag.: Black fears ko - and dies for it

To avoid the ko is impossible - here, White falsifies an eye so Black is left a cyclops.


[Diagram]
Diag.: Resistance, variation - 5 at 3

Again avoiding the ko yields only death for Black.



[Diagram]
Diag.: Failure 1

The throw-in here doesn't work - the marked point will become a real eye for the corner group, so the two disconnected black groups will have one real eye each and a shared eye - and thus live.


[Diagram]
Diag.: Failure 2

A similar result occurs if White approaches from the side.





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