Neat, good to know!

I don't think you can link communities like that ? Or maybe it's only supported in some clients / instances. My understanding is that you need to link them by using the usual markdown link syntax (or the link button below the editor) and input /c/anarchychess@sopuli.xyz as the link target.

Like this:

[anarchychess](/c/anarchychess@sopuli.xyz)

Which will render like this:

anarchychess

Note however that I've had some problems with this previously. I suspect that the first time someone tries to access a remote community from whatever instance you're on, your instance runs some heavy API queries which are prone to failure if either instance is under heavy load.