Gokyo Shumyo, Section 1, Problem 93 / Attempts

White to live  

looks so tesuijiish that it must be the start of the solution...and if , White has quickly captured the cutting stones.

White lives  

on .

There is still work to do for this diagram, however:

Ko for life?  

This variation allows no ko. But you're on the right track. Dieter

Even simpler  

Even simpler.

Nah...  

unkx80: here, and eyes win semeais.

Proposed solution  

After , Black suffers from shortage of liberties whatever he does. We will discuss variations as questions arise. --Dieter

Variation at 6  

Myself I see no way for White to avoid ko if in the previous diagram is played at here. --Dieter

xela: Yes, this is the solution given in World Weiqi Masterpieces of Life and Death (without the exchange of for ).