Horse exchange

hellow, do i have a good chance of get a t8 if i exchange 2 t7 courser? i try the horse cauculator but idk if that site is 100% trustworthy

 

I'd say you have a good chance but it's all up to RNG.
I wouldn't really mind those % calculations much because when it comes to RNG it is a very fickle thing.
You can breed two pure T8s together and still end up with a T7.
I've gotten that little red T7 female from breeding two T8s a couple times before (sometimes both T8s were both pure white/black).
But yes, two T7s technically should have a good chance of producing a T8.

 

You can mostly trust that horse calculator site. Two T7 Seven COURSER's do not guarentee a T8 outcome. The only thing 2x Courser guaraentee is that the foal will have 2 skills from the beginning instead of 1.
If you lucky you can get a T8 female horse with 1x T5 and 1x T6 horse, its all about RNG - But lvling the horse to max lvl and have a high Tier horse to breed, it increase the chance of getting a T8.