HuBimSu

An invasion of an opponent's territory that makes the opponent's territory dead or a bihk (seki).

Bob Myers: It seems odd that there would be a term used for an invasion which sometimes results in your opponent dying, sometimes in his living. What is the etymology of this word?

Sazn: Not sometimes. is the Hubimsu.

unkx80: I think the implication is that what looks like solidified territory is actually not, as proved by the Hubimsu of .

By the way, the correct play for both players is shown below, with the usual convention that seki is better than ko for the defender.

liopic: Hubimsu comes from Hubim + su(move). Hubim is the participle of the verb hubida (후비다) which means "pick the nose", "pick the ear".

Sazn: The First Example was a seki too

unkx80: But can open an approach ko.

Sazn: I believe this is better than the approach ko

Alex Weldon: Sure, but if W plays at a, this reverts to the first seki diagram. If B wants to force ko, he must play as above and make it an approach ko.

Now each player threatens to play at a. This is better for Black than a seki, but not by much. That's why it's normally better for White to respond at and take sente, rather than to respond at and take gote.