Gokyo Shumyo, Section 1, Problem 22 / Solution

The comb formation  

Black makes a comb formation, which is alive. Now a and b are miai.

Main line  

After and , it becomes obvious that a and b are miai.

Variation  

After and , it becomes obvious that a and b are miai.

Wrong 1  

Black seems a shapeful move, but actually it creates a bulky five. White strikes at the vital point.

Wrong 2  

Black invites White to create a ko with . Later ...

Later  

... when Black recaptures the ko, is an internal ko threat. Black must play and White can recapture. Therefore, in the previous diagram is better than a.

Wrong 3  

Black takes another seemingly vital point, but this diagram is rather a silly way to die.