If my maths is right, red will beat both yellow and black about 35% of the time, yellow will beat both red and black about 42% of the time, and black will beat both red and yellow about 24% of the time. (Which ties in with the probabilities given in the article: if yellow beats red 7/12 of the time but black beats yellow 7/12 of the time, then yellow will beat both red and black 7/12 * (1 - 7/12) = 35/144 ~= 24% of the time.)
