Beginner Exercise 100 / Solution

Solution  

To win the capturing race, Black has to play at .

Solution  

throws in and captures. Because of the special properties of the corner, White cannot play at a and so Black wins the capturing race by one move. Notice that and are interchangeable because white at "b" is auto-atari.

Failure  

fills the wrong liberty. captures the two black stones in a connect and die.