Can someone link me to Gerber's Sim? And my opinion about this problem is (1) without repetitions. Two things though, the amount of teams and rounds has to be set and the first pairing is VERY important, rank the teams according to their points (according to the rank of the country, world, whatever) and have the best team play against the worse, the second best against the second worst and so on. You should have the best at the top after some number of rounds.