1 - Don't Open Borders unless REALLY necessary 2 - Don't make Defensive Pacts with the AI. Ever. 3 - Don't go for a Diplomacy win without a bag of cash 4 - Don't be nice after you are called a warmonger. They now hate you forever, so you might as well kill them all 5 - Don't trust the AI on spying: they will always spy on you even if they promise not to! 6 - Don't ignore CS quests. They give you and ALLY with BENEFITS 7 - Don't forget to have an army ready to roll. Diplomacy doesn't always work! Add to the list of you can think of something else!