Trying to snap a four-game skid, the Chiefs stayed at home for a Week 13 AFC West rematch with the San Diego Chargers.  In the first quarter, Kansas City took the early lead with newly acquired kicker John Carney getting a 38-yard field goal.  Afterwards, the Chargers got on the board with kicker Nate Kaeding getting a 25-yard field goal.  In the second quarter, the Chiefs regained the lead with QB Damon Huard completing a 2-yard TD pass to DE Jared Allen.  Afterwards, San Diego tied the game again as QB Philip Rivers completed a 38-yard TD pass to WR Vincent Jackson. In the second quarter, the Chargers took the lead and the win with RB LaDainian Tomlinson getting a 31-yard TD run in the third quarter and a 28-yard TD run in the fourth quarter. With their fifth-straight loss, Kansas City fell to 4-8.  This also marked the first time since 2001 that the Chiefs have lost four-straight home games.. How many points were scored in the first half?