Educating and entertaining video helps explain IRV rules
There is a wiki article that provides background on Fizzbin:
Fizzbin is a fictional card game created by Kirk in the Original Series episode "A Piece of the Action". While being held hostage on Sigma Iotia II with Spock and McCoy, he spontaneously invented a confusing card game to distract the henchmen guarding them.
The rules were intentionally very complex....
more at the link
