Depending on what you consider to be "your turn", the AI trades during your turn. By my definition (but apparently not Firaxis's), the AI's turn is from when you hit the button for the end of turn up until your cities start producing. The AI has a chance to trade during your production.
This is most visible when you are the first to finish researching a tech. Right after you've finished researching on your turn, the cost to finish for the AI drops, they can complete researching the tech at the discounted rate, and then trade. After the AI finishes trading, you're then allowed to finish your build queues and move units.
You can see this in the save game I'll post. After you finish researching the tech, look at the "big picture". Then hit F4 to open trade negotiations. Note that no other civ has the tech. Close windows and allow the build queues to finish. Open up trade negotiations again, and other civs suddenly have the tech.
This researching out of turn makes it harder for the player to maintain a tech lead. In addition to the documented production bonuses, the AI only has to research at a one-Civ known tech rate for whatever you're researching.
The only way I can see this as being "fair" is if the order of turns is documented and confirmed as follows:
Player finishes builds.
Player moves units.
Player can trade.
Player ends build turn.
AI finishes builds.
AI moves units.
AI can trade. (?)
AI finishes build turn.
Player finishes research.
AI finishes research.
AI can trade.
AI ends second turn.
Also, I'm guessing that now that I've pointed out that you can initiate trades from the "big picture" screen, it will be taken out.
This is most visible when you are the first to finish researching a tech. Right after you've finished researching on your turn, the cost to finish for the AI drops, they can complete researching the tech at the discounted rate, and then trade. After the AI finishes trading, you're then allowed to finish your build queues and move units.
You can see this in the save game I'll post. After you finish researching the tech, look at the "big picture". Then hit F4 to open trade negotiations. Note that no other civ has the tech. Close windows and allow the build queues to finish. Open up trade negotiations again, and other civs suddenly have the tech.
This researching out of turn makes it harder for the player to maintain a tech lead. In addition to the documented production bonuses, the AI only has to research at a one-Civ known tech rate for whatever you're researching.
The only way I can see this as being "fair" is if the order of turns is documented and confirmed as follows:
Player finishes builds.
Player moves units.
Player can trade.
Player ends build turn.
AI finishes builds.
AI moves units.
AI can trade. (?)
AI finishes build turn.
Player finishes research.
AI finishes research.
AI can trade.
AI ends second turn.
Also, I'm guessing that now that I've pointed out that you can initiate trades from the "big picture" screen, it will be taken out.
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