Gokyo Shumyo, Section 1, Problem 28 / Solution

Traditional Solution  

is maybe a little unexpected. Up to , Black sacrifices his stones, to secure life for his group.

Continuation  

White captures the stones in gote.

Variation at 6  

in this diagram is followed by the atari at , and her stones are in shortage of liberties. This is better for Black than the main line.

Variation at 5  

Changing the order of and gives the same result, but it doesn't invite White to make the small mistake at in the previous diagram.

Variation at 2  

Black lives easily.

Alternative solution  

Changing the order of and also works.

Variation 1  

With as here, White cannot even capture a stone, because shortage of liberties at a prevents her from making the eye false.

Variation 2  

If here, makes miai of a and b.

Failure  

Black 1 does not put enough pressure on the invading group, allowing white to capture the two stones on the left. black's remaining stones have only one big eye.