A @jeopardy tournament in which an all-time great partners with the person who finally beat them? (Sorry, @bradrutter would have to sit that one out - 5-game limit, no you don't get @KenJennings) Have to think a @James_Holzhauer / Emma Boettcher team would be a strong favorite.
Or, regular tournament structure (one-game totals leading to 2-day final) except that one partner handles the buzzer and answers all the buzzed-in questions, but the other partner steps in to answer any Double Jeopardies uncovered plus has to answer Final Jeopardy.