HGG Community Forums

I think Ammit is the only person who understands exactly how it works. However, she has said that when crossing dangerous Kit mutations White Factor definitely has a factor. In fact, the first chart she made was based on assigning an increasing numerical value to each level of White Factor, from None (0) to Maximum, which was added to a numerical value for the amount of white each mutation caused. When the combined total of those two went over 100, the foal would die.

Here's a link to that chart. You can click on it to enlarge it to make it more readable.
https://www.huntandjump.com/forum/discussion/16695/lethal-kit-combinations-have-been-drasticly-updated#Item_6

You may have to copy the image and put it on a full sheet of paper in landscape mode to read it.