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I am a new Go player (I don't even know my rank) but I really enjoy playing. One of the strategies I have been using a lot of Kosumis, ending up looking a bit like a checkers game at the start. None of the stones are connected, but they easily could be if they were threatened. Is this a bad idea? What is it called?
Secondly, what do you call territory that might-as-well-be-mine but isn't?
Thanks! Sam
Kosumi is a safe move, but often rather slow. No high level players I'm aware use the strategy you describe. It sounds too slow to me.
The kosumi is used as part of a classical opening.
A kosumi is about 95% connected. However there are situations where it may be cut (ko, and also other shapes).
You may want to look at what SL has on the diagonal move, starting with this page: kosumi.
As for the question on territory, maybe moyo would answer your question.
Minue's Haengma tutorial for beginners has a thorough treatment of the diagonal play.
Well, the question in your subject title does not quite match what you are saying in the text. May I probe you with this question: do you know what "two eyes" mean?
As for your question "What is it called when you have the option to make life, but haven't yet?", I would answer unsettled. If you fear the kosumi being cut, then I refer you to miai.
Hope this helps.