Beginner Exercise 48 / Solution

Solution: Ko  

puts a black stone in atari. The only defence for Black is to set up a ko at .

Weak defence 1.  

If or a, White connects underneath at . Black is totally dead.

Weak defence 2  

shuts in White stones, but kills Black easily. Black can't approach at a nor b for shortage of liberties.

Reference ( at )  

This shape is dead even if Black has outside liberties. makes a killable shape with nakade.

Failure ( at )  

allows to make two eyes. There is no snapback at nor ko at .