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Here’s how to think about territory in Go:

1. If I like it, it’s mine.
2. If it’s in my hand, it’s mine.
3. If I can take it from you, it’s mine.
4. If I had it a little while ago, it’s mine.
5. If it’s mine, it must NEVER appear to be yours in anyway.
6. If I’m doing or building something, all the pieces are mine.
7. If it looks just like mine, it is mine.
8. If I saw it first, it’s mine.
9. If you are playing with something and you put it down, it automatically becomes mine.
10. If it’s broken, it’s yours.

(Strangely similar to the Toddler’s Rules of Possession)