ok, I think I understood it finally
I made a little test where I got a starting location that made my capitol grow in 10 turns and have two much better tiles (cattle on shielded grasland) in the 21-tiles-radius.
here it is:

I made a little test where I got a starting location that made my capitol grow in 10 turns and have two much better tiles (cattle on shielded grasland) in the 21-tiles-radius.
here it is:
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