Xuanxuan Qijing Problem 9 / Solution

 

reduces the black group into one eye. However, can White make two eyes for her inside group?

 

is necessary to deny two eyes. prevents seki. captures the four black stones. It's a bent four, but...

Surprise #1  

under the stones may be a surprise. Black is threatening ko by throw-in at and then capture at a. White calmly prevents ko with . After Black capture of four stones....

Surprise #2  

White unleashes her own under the stones. White is alive and Black is dead.