Thanksgiving was no holiday for the Chiefs.  The players and coaches spent the day on the field, practicing for their face-off against Oakland on Sunday.  The Chiefs are hoping to snap their three-game losing streak.  They did beat the Raiders a little over a-month-ago, out on the West Coast.  But a victory this weekend might be an uphill battle, what with Larry Johnson and his bad foot, and the injury-forced retirement of Priest Holmes.  Rookie Kolby Smith will start at running back on Sunday.