In round robin tie-breaking:

1) Unrated players shouldn't win an RR event unless it is the Open to
   prevent sandbagging.  Include their results initially in the
   calculations but don't advance them at the end.

2) Assign 2 "match points" for each win.
   Assign 1 "match point" for each loss in a completed match.
   Assign 0 "match points" for each loss in an uncompleted match
            (forfeit, withdrawal, injury, unplayed, unfinished, etc.)
   For each player count total match points, and sort.
   The player with the largest number wins.
   If multiple players are tied based on Level 2, then...

3) For each tied player count match points within only the matches
   among the tied players.
   If that leaves some tied at Level 3 then...

4) For each tied player calculate the ratio of games won to games lost
   within only the matches among the tied players.
   If that leaves some tied at Level 4, then...

5) For each tied player calculate the ratio of points won to points
   lost within only the matches among the tied players.

   If that leaves some tied at Level 5, then...

6) Declare a tie, or flip a coin.