Unconditional Safety

Definition

A block has unconditional safety when it is impossible for the opponent to capture it when given unlimited consecutive moves and the defender always passes.

Also see unconditionally alive.

Examples

SafeBlock1.png

Figure 1: The black block is unconditionally safe, since the two marked liberties can never be removed.

SafeBlock2.png

Figure 2: The white blocks are unconditionally safe.

GoTraxx

The SolverBenson class identities unconditional safe blocks (along with unconditional dead blocks).

References
David Benson. Life in the Game of Go. Information Science, vol 10 (1976), pp. 17-29. Reprinted in Computer Games, Levy, D.N.L. (Editor), Vol II, pp. 203-213, Springer Verlag, New York, 1988.

Last edited Aug 11, 2007 at 3:51 PM by tgiphil, version 11

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