is the only solution, setting up a ko for the life of the black group. If Black wins, he will capture
, making two eyes (well... three, actually).
, hoping to catch the white stones in a connect and die, is a failure. After
Black cannot play atari at a because of shortage of liberties.
at a,
fails similarly.
Bill: Black can live by capturing , but that should be a last resort. This is properly a two stage ko. Black should normally play to win it with
and
.
Continued on the /Discussion page.