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Not all foals from that cross will be silver blue roans. True breeding means if you breed two true-breeding horses of the same color together you will always get a foal of that color. As soon as you start crossing with other colors that goes out the window.

If you can get a blue roan out of a buckskin roan dun appaloosa depends entirely on the genetics of the mare.

Tarma, the best way to look at what possible colors you will get is to look at the homozygosity of each horse, specifically the base color which is formed by extension and agouti. Extension is represented by the initials E or e and agouti is represented by a or A. They work hand in hand to create the 3 base colors of horses: black, bay, and red. I won't get too deep in because it would take PAAAAGES to break it down fully.


To get a black horse, your horse must have one of the following genotype:
EE aa or Ee aa (agouti must always be reccessive and there must be at least 1 dominant extension)

To get a bay horse, your horse must have one of the following genotypes:
EE Aa, EE AA, EeAa, or EeAA (agouti must have at least 1 dominant copy and there must be at least 1 dominant extension)

To get a red horse, your horse must have one of the following genotypes:
eeAA, ee Aa, ee aa (extension must always be recessive- agouti status does not matter)

True breeding on this game is as Ammit said- you cross a true breeding horse to another true breeding horse of the same color and the foal will always be that color.

Your true breeding blue roan stud will have this genotype (and I am just typing the bare minimum required to have this color).
EE aa RnRn
This means your horse will always pass on 1 E, 1 a, and 1 Rn copy to his babies regardless of which allele is inherited.

Your true breeding silver black will have this genotype (again just bare minimum and does not take into account other modifiers) silver is represented by letter Z
EE aa ZZ
This horse will always pass on 1 E, 1 a, and 1 Z copy to their babies regardless of which allele.


If you breed your true breeding blue roan to your true breeding silver black, you will always get black (also called blue) roans with 1 copy of silver. This, again, does not take into account any other genes your horses are carrying- just the bare minimum.
EE aa Rn__ Z__


Your buckskin mare has this genotype:
EE AA __Cr (I am only typing out the base color plus the modifying cream which is what makes this horse buckskin rather than bay)

If you cross your blue roan stud to this mare, these are the possible outcomes
(stud) EE aa RnRn X (mare) EE AA __Cr

foals' possible genotypes:
EE aA Rn__ (bay roan)
EE aA Rn__ __Cr (buckskin roan)

Your stud will always pass on 1 E, 1 a, and 1 Rn.
Your mare will always pass on 1 E, 1 A, and 50% chance of cream.

Any resulting foals from this cross will always be bay based roans with a 50% possibility of cream.

Hopefully this makes sense and is helpful!

@TheBlueMoors

I have been on here a year and this is the most comprehensive explanation of this I have seen yet. Thank you very much!

This is my blue boy


FR870297

And this is the mare I was going to use because of her pattern


Redrum

And this is the other pretty girl I plan to use just for color


All Shined Up

VorpalAlice helped me out with some foals I can use in a few breeding seasons too.

Basically I get pretties from him outof both planned mares even if I can't get what I'm after with those two. Definitely still using them then.