2002 PDC World Darts Championship
... that an incident in which a player clipped another's heel at the 2002 PDC World Darts Championship was the catalyst for the creation of the exclusion zone in darts?
... that an incident in which a player clipped another's heel at the <b id="mwAyE"><a href="./2002_PDC_World_Darts_Championship" id="mwAyI" rel="mw:WikiLink" title="2002 PDC World Darts Championship">2002 PDC World Darts Championship</a></b> was the catalyst for the creation of the exclusion zone in darts?