KANSAS CITY, Mo. (AP) – There is a logjam at the top of the AFC West as we head into Week 9 of the NFL season.  Kansas City beat San Diego 23-20 in overtime Monday night for its fourth straight win and a piece of first place in the division race. The Chiefs, Chargers and idle Oakland Raiders are all 4-3 and two games better than last-place Denver.  After trailing the whole game, the Chargers were on the verge of winning it in regulation when they marched to the Kansas City 15.  With first-and-10 and 48 seconds left on the clock, Philip Rivers fumbled the snap and it was recovered by the Chiefs, who moved down the field for their own chance to win the game. But Matt Cassel badly overthrew his intended receiver and Eric Weddle’s second interception sent the game to overtime.  The Chiefs stopped San Diego on its first drive in OT and then won it on Ryan Succop’s 30-yard field goal with 5:19 left.  Kansas City will be riding its first four-game winning streak since 2004 into Sunday’s home outing against the winless Miami Dolphins. San Diego returns home to face undefeated Green Bay.