It's a legit, albiet annoying tatic-Basically, the person with the highest amount of points bets the same as the second person, locking their relative positions so 2nd place will still lose to him. However, this really just opens the throne up for someone else to make a gain on both of them, which is why it's fair play. You basically are gambling that the person in second has bet correctly, and that no one else will come and take first place outta nowhere.