Trigger if you make sure at least one of the KNN in each match is at least homo Lp, that really doesn't happen. In my four years of breeding KNN, I've only gotten one EEW SH filly and a handful of EEE SH colts.
I guess it will be a risk I'm willing to take :P Been getting a little bored only doing 2 breeds the last 2 years so I figured I would spice things up 👀