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The green is safe breeding, yellow/orange risky, and red/brown high risk.

And to add on top of that, certain kit genes combined with a certain WF can also cause some lethal genes be created or to combine to kill the foal. And what you are talking about is what's called Frame. OwO and Owo or owO is frame. A lot of white genes and again a certain range of WF can create a lot of lethal genes and most likely kill the foal when frame is put into the mix. What was the sire to the lethal baby? I could look at him to see what caused the baby to die.

@Wolevenfrost lol i have done that many times :))

Ill look him up

Ok i kinda get it now. My mare is a w2 and the stud was a w8 which put the foal at moderate risk of being born with the lethal white gene. I think i may have figured it out after really looking at the chart.

Frame is Olw for Overo, Lethal White. It is homozygous lethal, so breeding two horses with Olw has a 1 in 4 chance of a dead foal. The gene is written O when it does not carry the potentially lethal mutation. This is an entirely different gene than the various Kit mutations.

The Kit Lethality chart primarily deals with the hazards of crossing horses with various Kit mutations (refered to as White Spotted in the color name.) The Sabino, Roan, and Tobiano Kit mutations are less dangerous but the two Sabinos and Tobiano can still cause issues with mutations like White 1 and White 10 that put a lot of white on a horse.

There are two other genes that may cause dead foals. Splash 2 (PAX3^C70Y) and Splash 3 are homozygous lethal and lethal when combined. Splash 1 (Sps) and Macchiato, a closed gene, (SplashM) are safe with any other splash mutation.