As far as I recall,the draw for the 1972 Challenge cup had to be made twice as a ball( Leigh,the cup holders) had fallen out of the bag and nobody knew anything until the last ball out of the bag had no opposition
Hull had originally drawn Dewsbury Celtic at the Boulevard but second time around were given Rovers.
I seem to remember at the time that I wish the original tie had stood and that the Rugby League had fixed it for both Hull clubs to meet.
It mattered not in the end as we knocked them out 7-5