BeginnerExercise237/Solution

Solution  

After and , White must escape with . gets the 3 white stones in a snapback and lives.

Variation 1  

If connects, Black cuts at and captures more White stones.

Black overplay  

Hasty cut, , is an overplay. White can capture the cutting stones then.

Variation 2  

is no better. a and b are miai.

Variation 3  

from the other side is similarly met. a and b are miai.