Alyona - How can that be confidential? Why would it be?
I don't think you understood the question.
If it was confidential then why would the dev's program the Gravisca agreements to inform you of the city level required to develope the next Gravisca agreement?
This is something every player will learn/know as they progress (other than the old school members like myself that started before emporia existed or before emporia were changed to what they are now)
This is very important and useful data that helps new players grow their cities. (as we get to higher levels, Emporia are not something you can take and hold as the game is set up to favour aggression against them in such a huge way you can not hold emporia)
With the help of only 5 people i have a solid list i would like to post in the forums (this data is easy to collect - especially with the gravisca telling us what the numbers are)
But if this is truly confidential i will not do so.
Please review your decision for me and make sure it is in fact confidential - this is to assist new players to grow, it is not revealing the math or programming secrets the devs use for Persian Positions.