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Unconditional Life
Difficulty: Beginner
Keywords: Life & Death, Go term
Jan: I found I needed the following definition to understand Benson's Algorithm. A group of stones is said to be unconditionally alive if it can never be captured, even with the opponent playing against the group as many times as he wants. Examples:
No matter what White tries against this group, it can not be captured.
This group, although it is normally considered alive, can be captured by White - by playing at a, b, c and d for example. jvt: Benson's terminology is confusing: unconditionally alive usually means alive without ko in Go literature. Charles Matthews The point here would be that 'alive', the status of a group, isn't the same as 'no possible threats' against it', as in 'no ko threats ever possible'. This is a copy of the living page "Unconditional Life" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |