1) The throne can be used only to capture the king, not the "normal" pieces.
2) Yes, it should be considered as a draw but this site does not support a perpetual check detection yet. What you can do in such situation is to send a message to me and I will set a draw manually.
(do skréše) Dež seš napnoté(á), jak probihá tornaj, do keryhos vlitl(a), možeš ho se svéma spološpilošama okecat rovnó v "Mloveni" o toďteho tornaja. (HelenaTanein) (okázat šecke vechetávke)