Gokyo Shumyo, Section 1, Problem 73 / Solution

Main line  

is tesuji, and so is . If covers at , Black captures seven stones at a.

Variation at 6  

Capturing at obviously makes life.

Variation at 4  

creates shortage of liberties for himself.

Variation at 2  

here doesn't work because of atari.

Failure at 1  

The crude play of destroys all possibilities and White links up. If is to the left of , then White plays at the point .

Failure at 3  

This is essentially the same crude play as in the previous diagram.

Failure at 5  

Omitting the atari of at and cutting right away with , again gives White the necessary liberties.