
Re: Help in Breeding a triple crown winner
The key is going to be the stamina bar. A horse with a stamina bar that's less than 1/2 full isn't going to stay 1m6f. By all means breed 6f with 1m6f as you can still get a horse that will stay 1m4f+.
The other key is potential rating. You're going to want a horse that has an absolute potential rating of 90%+ and also have an a realised potential that's pretty much all of the absolute potential.

Here's an example of what I mean, the key being the two things above. The rest is fluff. Nice fluff to run faster perhaps but the two pointers above will get you a triple crown winner.