The rules that determine the production from the city centre tile have changed with the 1.21f patch. After checking various cities in a few different games, I came up with the following rules that seem to work. Please let me know if you find any cities that do not follow these rules.
For example a city on Plains with Cattle next to a River. Normal production (Food/Shields/Gold) from this tile is 1/1/0 for Plains plus 2/1/0 for Cattle plus 0/0/1 for River making 3/2/1. Changing Food to 2 and adding 1 Gold for the Road gives us 2/2/2. As Gold is less than 4, we change it to 4 making a basic production rate of 2/2/4 for a city built on this tile. Under Despotism, production would be reduced to 2/2/3, under Republic or Democracy, it would be increased to 2/2/5.
Now let's take the city in the above example and grow it under Monarchy. As a Town of pop 1-6, we had 2/2/2 which became 2/2/4 when we increased Gold to the minimum of 4. When it becomes a City at pop 7, we have 2/3/3 which becomes 2/3/4 when we increase Gold to the minimum of 4. When it becomes a Metropolis at pop 13, we have 2/4/4 (plus 1 Shield if Industrious and 1 Gold if Commercial), Shields and Gold are at or above the minimum, so no further adjustment is needed.
- Start with the production of the tile on which the city is built (including resources and bonuses).
- In the case of Forest, use the production of the underlying terrain (Grassland, Plains or Tundra).
- Change Food production to 2 (Food production is always 2 for city centre tiles).
- Add 1 gold (city centre tile contains a Road).
- Add 1 Shield and 1 Gold for pop 7+ City.
- Add another 1 Shield and 1 Gold for pop 13+ Metropolis.
- For pop 13+ Metropolis add another Shield if Industrious and another Gold if Commercial.
- If the resulting Shields are less than 1, increase to 1.
- If the resulting Gold is less than 4, increase to 4.
- Add 1 Gold if under Republic or Democracy.
- Add 1 Gold if Colossus is in the city.
- If under Despotism or Anarchy, the 3rd Food/Shield/Gold from each tile is lost.
For example a city on Plains with Cattle next to a River. Normal production (Food/Shields/Gold) from this tile is 1/1/0 for Plains plus 2/1/0 for Cattle plus 0/0/1 for River making 3/2/1. Changing Food to 2 and adding 1 Gold for the Road gives us 2/2/2. As Gold is less than 4, we change it to 4 making a basic production rate of 2/2/4 for a city built on this tile. Under Despotism, production would be reduced to 2/2/3, under Republic or Democracy, it would be increased to 2/2/5.
Now let's take the city in the above example and grow it under Monarchy. As a Town of pop 1-6, we had 2/2/2 which became 2/2/4 when we increased Gold to the minimum of 4. When it becomes a City at pop 7, we have 2/3/3 which becomes 2/3/4 when we increase Gold to the minimum of 4. When it becomes a Metropolis at pop 13, we have 2/4/4 (plus 1 Shield if Industrious and 1 Gold if Commercial), Shields and Gold are at or above the minimum, so no further adjustment is needed.
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