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15-20 people for 3 days with barbecues, a river, bowling, billiards, and football – that’s very optimistic :).
In this format, perhaps it would be better to hold a match between Michurinsk and everyone else, so that each person plays no more than 2-3 games.
In Kyiv, people complained that they spent the entire trip in the basement, even though they played only 1 game per day. But in this tournament, the minimum is 4 games over 3 days.