RTG Problem 22 / Solution

Solution  

is neccessary to prevent White from living with the bent four living shape.

Solution  

The throw-in at is vital in this problem. After , since White cannot make the approach move at a, it is impossible to capture the stones in a connect-and-die.

Failure

Failure  

The direct placement at is wrong. is a good move which makes the approach move at a possible, so capturing the stones in a connect-and-die and making the second eye at are miai.