The rules of the original game aren't fully known but Linnaeus says the edge not the corner. He doesn't mention whether or not the king can take part in captures but evidence from references to other tafl games suggest he couldn't.
(kaŝi) Se vi volas saluti iun en ties denaska lingvo, provu nian 'vortaron de ludanto', en la ligo "pli pri lingvoj" sub la flagoj. (pauloaguia) (Montri ĉiujn konsilojn)