i don't see any pattern regarding which die is used to determine the number of spaces moved on a three-die roll in which one die is a six. most often, if i roll a six plus two dice of different values, my piece moves the number of spaces determined by the lower-numbered die, but sometimes it moves the number of spaces determined by the higher-numbered die. is there any rhyme or reason to this, or is the distance of the move just chosen randomly from the values of the dice that aren't sixes?

and why do i sometimes roll four dice?

and above all, why aren't these questions answered in the rules?