The Great Confrontation

I think two groups might be too few. Playing a minimum of 12 games in a group to determine the top 16 seems like an exaggeration. Experience shows that in groups, some players often either disappear or have significantly incompatible schedules, while in the playoffs, things usually move faster. Therefore, I suggest approaching it from a different angle and arranging the maximum number of games in the next round, while limiting the groups to a maximum of 6-7 players, with 2-3 players advancing from each group, and then each playing against each other, for example:smile13:

Another suggestion: award 2 points for a win and 1 point for a loss, so that players who participate have an advantage over those who don't.