- A group is said to be topologically alive if (1) the units of the group completely surround two or more single-point eyes, and (2) each unit of the group is adjacent to at least two of those eyes.
While Landman remarks that it is probably provable that any pass-alive group can be made topologically alive, he does not appear to use the concept of topological life in any significant way in the above paper.
- Benson's Definition of Unconditional Life — A group is pass-alive if each of its chains has at least two eyes completely enclosed by the group
- Two Headed Dragon — A topologically alive group having two eyes that look false
- Two Eye Formation — (used in by Robert Jasiek in rules) A set of chains sharing exactly two liberties and having no others
- Fractional Eyes — A presentation of some elements of the paper Eyespace Values in Go cited above