In this problem, Black must watch out for the liberties of the group, so Black cannot make every possibe sente moves in the attempt to live.
immediately makes an eye, forcing
. Without playing anything else, immediately make a throw-in at
and catch the three White stones in a connect-and-die with
for the second eye. If
is played at a or b, then
continue as shown in the diagram.
If avoids the connect-and-die, then
captures three White stones in a connect-and-die.
Do not make unneccessary sente moves like , because it reduces Black's liberties. After
, Black cannot atari at a without putting the entire Black group into self-atari, so Black dies.
at
is a similar failure,
at
kills similarly.
Ahthough captures three White stones for an eye, it is played in the wrong order and so
destroys the other eye and kills. Note that this is similar to the box connection, a and b are miai for the connection.
Bill: After lives,
-
are sente, as are
-
.
Then -
are sente, leaving behind the small ko.