I'm surprised the article didn't mention the ole "Knee to the groin" tactic.
My friend, Al Buck, just lost his fight Friday night thanks to that one. It didn't help that he also broke his foot when he landed a kick on George Sullivan's knee prior to the nut crush. Granted, Al had the option to say he couldn't continue but he knew that would disappoint the fans. Any man in the world knows, 5 minutes is NOT enough time to recover from a serious nut blast. It takes the fight right out of you.
Punches to the back of the head are another infraction that is rarly penalized beyond a warning. Al also suffered a couple of those before the ref stopped the fight as a TKO.