Pass Dead


A group is said to be pass-dead if it is impossible to avoid capture even if the attacker first passes as many times as the defender wants (but not forever).

This is the opposite of PassAlive, and both are limiting cases of n-alive. To defend PassAlive stones, the defender does not need to do anything at all. However to capture PassDead stones, obviously the attacker eventually has to move. The idea is that, the defender can make any number of moves first before the attacker starts, but the group still cannot be saved.

The marked stones are dead, but only the black one is PassDead.  

fool (2023-03-05): I did not see a name for the opposite of PassAlive. PassDead seems like the obvious name. If it is named elsewhere, I apologise.

Pass Dead last edited by fool on March 5, 2023 - 23:50
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