Kyu Exercise 85 / Solution

White kills  

White starts by playing on the eye point at . Black is forced to prevent from connecting to White's stones on the outside by playing at . White throws in a stone at to limit Black's eye space. Black captures the sacrifice stone and White kills Black by occupying the two central points of the bent four shape.

Failure  

It is a mistake to reverse the order of and in the solution diagram. Here, lives because White is now unable to usefully play at a.