Scoreholio uses something called a random number generator (RNG) to assign random partners in blind draws. Scoreholio applies random number generation by generating two random numbers representing players. If those two randomly generated numbers aren’t the same number, then the players they represent are matched up.
Tournament directors have the option of grouping players by skill level before the randomization process, and of manually pairing specific players.
To dive deeper into randomization process and options, click here.