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ko threat classification
Path: SecondCourseOnKo   · Prev: KoThreat   · Next: KoThreatFunctions
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What is a ko threat? Depending on your definition, every tenuki or pass could be called a ko threat. More generally, one speaks of restriction threats. If passes are involved or threatened to be involved, then one calls the particular restriction fights pass fights. --RobertJasiek


BillSpight: What is the threat of a ko threat?

Not the threat to retake the ko. Any board move does that (and sometimes passes, depending on the rules). The threat is to make another local play if the opponent wins the ko (or, in complicated kos, makes another play in the ko).

Yes, some people define ko threats so that every play or virtually every play is a ko threat. But that definition is so broad as to rob the term of its meaning, isn't it?

So we see that "ko" and "ko threat" definitions depend on the purposes of stating them. From a view of move legality about each move is a ko threat; from a view of perfect play fewer moves might be ko threats. --RobertJasiek

Sometimes ordinary plays (and even passes) have one of the functions of a ko threat. I used to call these phantom ko threats, but now I call them virtual ko threats.

I classify ko threats according to function on ko threat functions.


Robert, how about a page on pass fights? I think people would find it interesting. :-)

No doubt, unfortunately, currently I lack time. Maybe somebody could cite my RGG contributions in the pass fight and virtual ko threat threads. Otherwise everybody must wait for GRE:) --RobertJasiek



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