def guess_round(driver)
      Algorithm::RoundRobin.guess_round(driver.seeded_teams.length,
                                        driver.matches.length)
    end
def guess_round(driver)
      Algorithm::RoundRobin.guess_round(driver.seeded_teams.length,
                                        driver.matches.length)
    end
Guess the next round number (starting at 0) from the state in driver.

 @param driver [Driver]
 @return [Integer]