1) Selling Cities
I pay Civ A to war with Civs B, C, and D. Then I Dow Civ A with the intention of capturing cities and selling to Civs B, C, and D.
I capture Civ A city #1 and sell to Civ B. Civ A recaptures city #1. City #1 is in my way, blocking access to cities #2-4, which I want to capture and sell. I capture City #1 again. Is it a banned exploit for me to sell city #1 a second time within the 30 turns that the first trade deal is still in effect (meaning I would have to give it away for free, as I don't want it)?
If city #1 capture includes a Liberate option, would it be a banned exploit for me to sell it upon the first capture and then, within 30 turns, re-capture it as described above and Liberate it?
2) Trading resource for lump sums
I improve and sell resource (sale #1). Nearby barbarian approaches and pillages my resource. I kill them, repair the resource, sell it again (within 30 turns of the first sale), and clear their camp. I trust this is perfectly fine up to this point, as there is no attempt to establish a repeated pillage/sale situation of my own construction.
AI units enter my territory and pillage the same resource. Let's say it's just 1-2 units, a minor response from an early worker steal kind of scenario. If I fend them off and repair the resource, can I sell it within 30 turns of the very first sale (sale #1), which would be a 3rd sale within a 30-turn window? Again, this would not be a repeated pillage/sale situation of my own specific construction, but a sequence of events that might happen within a 30 turn stretch.
3) Restarting from initial autosave to preserve city state composition
I play a game far enough to become aware of the composition of all city states; it is a favourable composition. If I load the initial autosave and Restart, the new map will include the same city states - and of course the same AI, which notably can be pre-selected. I don't see this mentioned, so I will broach the topic and ask whether a subsequent game played knowing the composition of these city states would be accepted by the HoF?
I personally feel that allowing players to pre-select their AI opponents, rather than requiring random opponents to be HoF eligible, sets a precedent in favour of allowing such a restart. The advantage of knowing the CS composition before your AI opponents meet them would be similar to the (allowed) advantage of knowing the AI opponents you pre-selected before they meet each other.