😀

off the help page <http://www.redhotpawn.com/help/index.php?help=tourn>:

Pairing
This may either be 'Original' or 'Random'. In a 'Random' tournament players are allocated between groups randomly. In an 'Original' tournament players are distributed by rating between the groups so the best rated players do no meet until later rounds.

Hope that helps.

Gotti