Beginner Exercise 120 / Solution

Bulky five  

The solution of this problem comes when one realizes that the marked spaces actually form a bulky five. White can safely ignore the ko shape.

White kills  

After , this area is only one eye - a and b are miai. The marked point is a false eye, so Black is dead.

Needless delay  

White capture of the ko is a needless delay - Black will use the recapture as a good ko threat later.