This is another one of the advantageous pairings a breeder can do. The advantage is, that all the different mutations that hatch out will be guaranteed to be het for the other, other than the visual Candy Pied that could be produced. The only draw back to this pairing is that you still stand a chance of producing normal looking animals within the clutch.
The resulted breeding provides us with:
4 x Double het Candy Pied (MmRr)
4 x Candy het Pied (mmRr)
4 x Pied het Candy (Mmrr)
4 x Candy Pied (mmrr)