Joseki-related life-and-death example 11
After the double approach (
stones),
-
are joseki.
If the corner group later gets surrounded (
stones to indicate this), and the top side is white (
stones to indicate this) the moves
-
are sente.
If black plays tenuki after
, how can white kill?
and
are not hard to find, but the tesuji sequence of
-
is quite nice.
Now black can try a number of things.
Simply connceting is pointless.
and
create a bulky five.
attempts to create liberties along the top, to prevent white from cutting at a.
But still, after
-
, a bulky five is formed. Black is dead (Note that black should not be able to make eyes along the top, hence the requirement of the
stones.
This
doesn't work either. After
, black is captured. The same refutation works for
at a or b.
With
here, black is trying to tempt white to cut. But
is simple and correct. If black plays
to prevent the bulky five,
cuts with atari, and black is captured in a ladder.