My apologies if this has been answered elsewhere, but I didn't find it in a search engine. Era Score can be "purchased" with Amani by doing the following:
1) Levy the military of a city-state in which Amani is assigned, earning you one point of era score.
2) Assign Amani to another city, causing you to lose suzerainty.
3) Re-assign Amani to the original city-state, causing you to become Suzerain again.
4) Go back to 1.
I see that the Fandom page for Hungary lists a similar "strategy", so I guess this is well-known? The fact that it hasn't been patched out leads me to think that the game developers are aware of it but don't consider it to be an exploit. But probably it's banned in multi-player games?
I should also add that I have only R&F on the iOS, so I'm not familiar with what's allowed in GS and other platforms which have had more recent updates.
1) Levy the military of a city-state in which Amani is assigned, earning you one point of era score.
2) Assign Amani to another city, causing you to lose suzerainty.
3) Re-assign Amani to the original city-state, causing you to become Suzerain again.
4) Go back to 1.
I see that the Fandom page for Hungary lists a similar "strategy", so I guess this is well-known? The fact that it hasn't been patched out leads me to think that the game developers are aware of it but don't consider it to be an exploit. But probably it's banned in multi-player games?
I should also add that I have only R&F on the iOS, so I'm not familiar with what's allowed in GS and other platforms which have had more recent updates.