Beginner Exercise 229 / Solution

Solution.  

White should simply retreat from to , not allowing Black to play a in sente. When crawls further, can block because this is a tiger's mouth. So Black dies as explained in the L-group page.

Failure  

If white plays , then threatens to make a living shape (see the L-group page for details). If white tries to kill with , then black connects to the outside with . Alternatively, white could try at , but then black lives by playing at a.