The profession of a professional debater, engaged in accepting money bets for various upcoming events (most often sports) with pre-determined coefficients, which are determined by probabilities, as well as payment of winnings. Bookmakers accept bets when playing on races and races, on the results of various sports, political, cultural, financial, weather, and other events. For a bookmaker, it is important to be able to forecast well (independently or based on other forecasts) the estimated probabilities of events for which bets are accepted and the future popularity of various bets among potential customers.