Formula for city tile shields

I decided to test what affects city tile shield production, to figure out why some city centers produce more shields than others. Here's what I found.

Shields from unimproved terrain
+Shields from bonus resources
+1 if city size >= 7
+1 if industrious and size >= 7
+1 if city size >= 13
+1 if shields==0 so far
+1 if in golden age/mobilization

The interesting part is you only get the 0-shield-terrain bonus if the city is size 6 or less. Building on shielded grassland is not any worse than building on regular grassland after you reach size 7!

Originally posted by DaveMcW
The interesting part is you only get the 0-shield-terrain bonus if the city is size 6 or less. Building on shielded grassland is not any worse than building on regular grassland after you reach size 7!

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Never noticed that! This makes building on a shielded grassland less painful than it otherwise sometimes feels -- particularly when the shielded grassland is your civ's start location (which is otherwise quite nice but for the location on the shield).

Thanks.

Babump! I think more people need to see this.

My reaction is the same as Catt's - I have always tried to keep away from shielded grassland as well. I will still try to if there are few shielded grassland around, since one additional shield is very important in the early game.

But this means that I can relax a bit more, especially when there are a few other bonus grassland tiles around.