Ugly sagari
HolIgor: I would call this ugly sagari tesuji. It appear with two unfriendly stones that cut off our forces and there is some shortage of liberties. The following diagram is just a general scheme. But the move is useful to remember.
Dieter: Let's explore the alternatives.
recaptures at
and it's an approach ko. Black must make an approach move at a to make it a direct ko.
After -
, White makes the ugly sagari all the same. Isn't this better ?
unkx80: I believe this is an instance where the "ugly sagari" is the only correct move.
John F. Excellent name! And like the ugly duckling it can turn out to be a beautiful swan.
AYHAL? Another alternative to consider which is often useful:
unkx80: However, this results in a ko when the "ugly sagari" tesuji wins the capturing race without ko.
(sIG): This one doesn't look like much of a ko fight to me...
I mean, black _is_ trapped for good, no? He cannot fill the ko square at . What he can do, is to play at a and make white take at
and then there is a ko, but the bet for white is also her group of four, that is, higher than just to get the black stones. Without black stone in a, white can simply consider the black stones dead.
Bill: After above,
makes a big ko.
See also