There are three Mandarins, but this is the one everybody actually does. Its original name was probably "you did Mandarin (sans convention) wrong", but that didn't really roll off the tongue so well. And since it's so readily apparent that those holds out right should be in (and that they make the problem doable for the 90% of the world who don't have 190CM reach and a 15CM pinch grip) that this much nicer line was officially born.