The stage is set: An auditorium in IBM Research's headquarters in Yorktown Heights, N.Y., has been transformed into a stage for the IBM Jeopardy Challenge this weekend, which pits Jeopardy champions Brad Rutter (who holds the record for most money won on the game) and Ken Jennings (who won the most consecutive "Jeopardy" games) against Watson, a computer with the ability to process complex language queries.