Algorithm or not

[Julmasara]

I've attached a screenshot of my application's datagrid, taken after the round-participant arrangement ran.

The result is based on the following/your logic

foreach participant p1
{
  for each round
  {
    foreach participant p2 != p1
    {
       if(
       p2 not in current round
       p1 not in current round
       p2 and p1 have not paired yet)
       then -> make unique pair and assign it to current round.
    }
  }
}

As you can see, I still end up with the situation that certain participants have to wait a round or two.
(round 6 and 7 are not in the grid because of the round limitation I've set in the code.)

Thanks alot for sharing your thoughts on this.
Very much appreciated!!

P.S. Deelnemer = Participant, RondeX = RoundX