Anyone heard of the six point rule?
The six point rule (6目ルール) is that surrounding 6 points will usually secures life.
Let's first apply the rule to two groups to see how it works.
In this shape it looks like white has surrounded 6 points. If we are naive about it then we would reach a dead shape, see the next diagram, though it could be possible to escape
However, with a better defense, seen in the next-next diagram, it is clear that white does survive and indeed has 6 points. I'd say that the rule predicts that white is alive based on the more naive variation. That is white is surrounding 6 points on the face of it. It is a useful visual guide for spotting tsumego in your own games but you need to be very careful.
Now, here is a shape where white does not have six points. White could be said to have 5 points, on the face of it. This shape is therefore predicted to be dead if black attacks.
Here are some shapes that are alive, have six points and I shamelessly lifted from the linked youtube video.
Is this one of those ancient sage wisdoms that no one has heard of? Are there any other similar rules? I can't seem to think of any.
I think I recall hearing about it long time ago. Something passed on by a friendly Japanese man to the local Go club. I might not remember that correctly, I didn't believe in such rules back then
Now I heard about it (again?) from the Shibanos channel.