Xuanxuan Qijing Problem 71 / Solution

Modified version Solution:ko  

(The original has no marked stones and intends to be a kill problem with the diagram sequence. But it involves outside complications)

Alternative Solution: simpler ko  

In fact, here leads to ko without outside complications. is the only defense to prevent escape because....

Variation  

... block is defeated by ! and ! This means the modification is not fully satisfactory.