Enter the number of players and rounds in the "Calculation Inputs" box, and click
submit.
Running it with include draws (default) checked, it will try to figure out which
players can draw into the top 8.
Running it without intentional draws is for scenarios like MTGO where there are
no intentional draws.
In both ways if a player gets paired down, the player with the highest score wins.
Similarly, a "bye" is always given to the player with the lowest score, if there
is an odd number of players.
If you think the results are incorrect for some reason, please send me a message
at playordraw (at) gmail (dot) com with as much information as possible.