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Please register me for the tournament.
I support dividing participants into groups, but I'm against having fathers and sons in the same group. It's unclear how this will work based on preferences, and what to do if there are more participants who want to be in one group than in another. I support random grouping.
Added 11 minutes later
The skill level is approximately equal; naturally, some are slightly stronger, and some are slightly weaker. But not to the extent that you can predict the outcome of a match from the start; there's always a decent chance of winning.