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Alive
Path: EyesCollection · Prev: WhenFalseEyesAreEyes · Next: Dead
Difficulty: Introductory Keywords: Life & Death, Go term
A group is alive when it can't be captured.[1] There are several ways in which a group can 'live'. The most common are:
[1] That is, the group as a whole isn't one the opponent can forcibly capture. Stones within it may be captured. [2] A group that does not obviously have two eyes, or is not clearly in seki, is still alive if it is guaranteed to be able to get two eyes or make seki, regardless of who plays first. By this extended definition, groups that seem to be alive, or are alive can die if a player is negligent. See pass-alive, also ambiguously called unconditional life. Being alive is one possible status of a group, as is being dead; in between groups are called unsettled, or in more open positions weak groups.
Based upon [2], I strongly opine, if not declare, that a group is alive if, and only if, its death could only come at the hands that group's color. In the diagram showing one simple example, Tactics for making live groups can combine threats: to make an eye, or to connect.
In this example the right-hand white group is alive, with two completely explicit eyes. The following diagram shows that the left-hand white group is also alive. The right hand group is of some help for that.
White can answer
See also the Eyes Collection. Path: EyesCollection · Prev: WhenFalseEyesAreEyes · Next: Dead This is a copy of the living page "Alive" at Sensei's Library. ![]() |