he AI, the AI becomes incompatible to its own former games. 
</p>

<p>
The Empire.Persistent object is equally easy to use once you have implemented it, but the implementation is a bit difficult. This will be subject of the next section.
</p>

<p>
Note that games can only be saved and restored in the turn of the human player or supervisor, it never happens during an AI turn. So you never have to continue a half-done turn.
</p>

<p>
All in all, there will be 3 different types of data in your code, which you 