Four points in a row, (whether straight four, bent four or twisted four), are enough to live.
In the straight four, and
in the diagram are miai.
Five-point eye shapes are alive except for the crossed five and the bulky five. Some examples:
Six-point eye shapes are alive except for the rabbitty six. An example is rectangular six.
Almost all eye shapes of seven points are alive. See the Bulky Seven shape.
This shape (butterfly seven) is one that seems most likely to be killed, but after the position is seki.