A game-theory nerd named Arthur Chu has been kicking butt on Jeopardy. From The Atlantic Wire:
Due to Arthur's newfangled shenanigans, Wednesday's Jeopardy ended in a rare tie. In Final Jeopardy, the leading contestant typically wagers $1 more than double of the 2nd place contestant. If both answer correctly, then the person in the lead wins by that extra buck. But Arthur did not add the $1, wagering enough so that if he and Carolyn both answered correctly, they would tie. And that's exactly what happened, as both moved on to the next round. He made the same move on Tuesday, as well, though he was the only contestant to answer correctly. "Interesting wager," host Alex Trebek condescended, after the tie.
While it seems strange, it's actually the correct move to make, says The Final Wager blog, the brainchild of former Jeopardy winner Keith Williams that breaks down the proper mathematical wagering. Basically, the whole point of the game is to move on to the next round. Whether or not someone joins you is largely irrelevant. In addition, there's a certain mind-game tactic that can make the trailing contestant bet an irrational number. While the numbers stand behind these ideas, Tuesday's tie-targeting move was the first to do so all season, Williams said. "It's really cool to see this happen," he said. In fact, Arthur admitted to Williams that he got the idea from his videos.