After getting four puzzle pieces (

) I've discovered how it works!
Okay so here's what I know:
First you pay the fee, then you play. Say there are five players, Player A, B, C, D, And E.
Say Player A plays twice. Player A and B are first to send in their scores, so their matched up. Say player A wins, then he would have one win, and B would have a -1 next to his name. Next is A and C. C beats A, so the score would look something like this:
Player C 1 Points
Player A 0 Points
Player B -1 Points
Next is E and D. Say E wins. It now looks like this:
Player C 1 Points
Player E 1 Points
Player A 0 Points
-------
Player B -1 Points
Player D -1 Points.
Elsewise, I have no clue how they decide a tie. There are a lot of different theories.