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Well, if it's a league, there are home games and away games, meaning you play against SoD/HotA players, and when playing away, the opponent chooses the version. That would be a good system. Both HotA and SoD players would get better at both versions. Also, you could make paid and free leagues as an option; whichever one dies out would be the less popular one. To avoid rescheduling games and other issues, have a specific schedule, for example, a week (or two) to play a game against a specific opponent. Odd days are Saturday-Sunday at 2:00 PM; if you don't show up, you lose points and wait for the next game week (allow players to play earlier by mutual agreement). If a player misses more than 3 games, they are disqualified and moved to the lowest league, for example, with -30 points. Yes, you can come up with all sorts of things))).