Caveats
Groups that are alive may yet die. One reason is that they may be sacrificed, in the course of a ko fight.
Another way in which the ko rule enters the discussion is through the complications ko adds to the classification by status. It is quite possible for a group to be alive in ko: that is, the group is conditionally alive, the condition being to be able to win a particular ko fight relating to the control of a key intersection.
Read more about this topic: Life And Death