So far I'm seeing discussion of rules .... that's probably the reason we quit sparring in my instructor's dojo. It was only done during high ranking promotions and with NO rules. (Or equipment either, i.e., cup, mouthpiece, pads, etc.) .... Now it's a timed event of up to 90 mins with minimum numbers of punches, kicks, and blocks required ... much safer and much less BLOODY. But at least the old way wasn't the game of "tag" that so many schools view as "sparring".