According to The Philadelphia Inquirer, officials at the recent 2009 Sudoku Nationals are investigating suspicions of cheating.
They suspect the third-place holder of cheating. Flags were raised when the contestor could not complete an “easy” sudoku puzzle in the initial stage of the competition. The suspect was playing with a hooded sweater and perhaps the officials suspect that he had help from the outside. It seem like headphones were allowed in the tournament.
Lets hope it is all a misunderstanding.
You can read the full Sudoku article here.