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HuBimSu
    Keywords: Go term

[Diagram]
corner

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. B1 is the Hubimsu.

unkx80: I think the implication is that what looks like solidified territory is actually not, as proved by the Hubimsu of B1.

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.


[Diagram]
corner



Sazn: The First Example was a seki too

[Diagram]
corner

unkx80: But B5 can open an approach ko.



Sazn: I believe this is better than the approach ko

[Diagram]
corner


Bill: The ko threat situation makes a difference. The standard response usually depends on Black's having a big advantage in the ko fight. Most of the time it looks like the next diagram is correct (orthodox play) when Black plays first.

[Diagram]
Normal

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 W2 and take sente, rather than to respond at W3 and take gote.



Question: If the play becomes a ko for life and death, is the invasion still Hubimsu?



This is a copy of the living page "HuBimSu" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.