Following on from this great work seems like a reasonable place to add some thoughts on the relative merits of the two "power" tiles â grassland gold vs lake fish. All fish feels like it should be better than all grain for the reasons T-Hawk explains, and there is more of a contrast between the fish and gold options to investigate.
Here is my assumption-rich amateur analysis for you guys to pick holes in.
In the early game, mass gold is definitely better. Say you're improving your 4th tile:
To improve: Gold is 7 worker turns (and you get 20+ hammers from a chop); fish is a new 30h workboat. The fish can be done faster with only 2h plus the centre tile, but you could be spending those hammers elsewhere.
Yield: Gold is 1h, 8c
immediately; fish is +4f, 2c and the
promise of 2 specs for 12bpt, 12+gpp (with Philosophical) at some point in the future (depending on civics, happy cap and so on) in exchange for the food. Fish does need further investment in a lighthouse and Moai Statues to make it more productive, but surplus food does have other benefits
In the late game, yield is everything and fish unquestionably wins if youâve settled more great people (numbers include bureaucracy bonus for hammers & commerce):
Gold 4.5h (levee, railroad), 12 commerce
Fish 1.5h, 3c plus 1.5h,13.5bpt, 22.5gpp (2 science specialists and half an engineer) plus further benefits of any additional settled great people.
There are two big multipliers which the alternative approaches also affect: Bureaucracy (likely to be earlier with fast-start gold and/or choppable forest for Oracle) and the Academy (food surplus likely to mean earlier scientist).
This is the kind of thinking I should have done before the game, rather than after.
These musings also need someone to come along and provide a conclusion.