Guide to Five City Challenge (5CC)

[Charis]

A new book entry has been added:

[drupal=190]Guide to Five City Challenge (5CC)[/drupal]

Five city challenge, or 5CC, is a variant game where your civilization can ONLY have five cities. That means accepting no flips, always razing instead of capturing, and making the most out of the few cities you have.

Having done well in several medium difficulty 5CC, and somehow pulling off a 5CC conquest victory on deity, there's a lot I've picked up and wanted to share in this guide.
What makes 5CC hard?

• Quite limited production, income, and area
• High likelihood of missing several key resources
• Likely few luxury resources as well
• Can never have more than one army (can support 1 army per 4 cities)
• No forbidden palace (which means no using FP as placeholder either)

What makes 5CC doable, in fact, why five and not 4 or 6?