I hosted a 20 person tournament recently and had 5 high schoolers join (along with their dads). The high schoolers don't play much (especially for money), so they didn't last super long. For the next tourney, if there are a similar handful of high schoolers who join again, I was thinking of doing a sub-prize for the high schooler who lasts the longest, awarding say 10% of the prize pot for this winner. It seems pretty straightforward as I think about it, but are there any details that I should be thinking about?