Beginner Exercise 44 / Solution

Solution  

Black can kill White unconditionally.

There is death in the hane - threatens at to destroy the second eye. If White blocks at , Black plays throw-in - White can't connect at because of shortage of liberties. After the capture , still destroys the eye, so White is dead.

Failure  

Throw-in first does not work - White is alive after .

Weak defense: Ko ( at )  

capture is weaker: leads to ko for the second eye at a.