It will still require the number of participants to be non-prime :)!
You probably could make the pairing work and allow players who have played before to play with reverse colors. It probably can be done but it requires some combinatorics, I have not done the work :)!
It will still require the number of participants to be non-prime :)!
You probably could make the pairing work and allow players who have played before to play with reverse colors. It probably can be done but it requires some combinatorics, I have not done the work :)!