Add a new dynastic rule, called Variance:

Each Parallel Dynasty has a Variance score, which may be tracked on their history pages.

A Parallel Dynasty’s Variance score is defined as follows:

* Each Parallel Dynasty has a starting Variance score of zero;
* 1 is added if it has a different Emperor from the Prime Dynasty it varies from;
* 1 is added if a different player wins that parallel dynasty, compared to the Prime Dynasty it varies from (where “winning” the parallel dynasty here is defined as “is the Emperor of the subsequent parallel dynasty”)
* 1 is added if the theme is different from the Prime Dynasty it varies from