Zombie troop addition mechanics

[Fenghiskhan]

I've seen the zombies get +1 or +2 per territory when it has about 20 territories, I've seen it get 101 while having just 4 territories. What gives? I've seen the zombie outbreak happen when it already had territories, and I've also seen a lack of zombie outbreaks happen over many many turns in late-game when it was 1v1 against a zombie. What are the ACTUAL mechanics of the zombie outbreak and the zombie draft?

[IvanErtlov]

Zombies multiply and outbreak based on AI difficulty and game round number. Outbreaks are random, but the higher the troop count in a territory, the higher number. Plus, Zombies convert a certain % of defeated troops to Zombies, too.
However, there is a cap on the total number of zombies in relation to living troops on the board. As soon that cap is reached, they grow only slowly (+1, +2 or +3) untill they fall under the cap again.

In a nutshell, you cant defeat Expert Zombies in the End game unless you have progressive card bonus.

[Fenghiskhan]

Got it. So, the zombies, if they're backed into a corner, can ramp up 100 troops in one turn because I have a lot of living troops? Is that probability based or triggered in a definite way? Thanks.

[Karl Klammer]

Originally posted by IvanErtlov:

Zombies multiply and outbreak based on AI difficulty and game round number. Outbreaks are random, but the higher the troop count in a territory, the higher number. Plus, Zombies convert a certain % of defeated troops to Zombies, too.
However, there is a cap on the total number of zombies in relation to living troops on the board. As soon that cap is reached, they grow only slowly (+1, +2 or +3) untill they fall under the cap again.

In a nutshell, you cant defeat Expert Zombies in the End game unless you have progressive card bonus.

Is there a documentation or a rulebook or something, to research this?