A division the Kansas City Chiefs ruled on their terms the past three seasons is now up for grabs as the AFC West chase plays out in the final month of the 2019 season.The Chiefs (7-4) still face each of their division rivals at home, and they carry a one-game lead. The team in closest pursuit, the Oakland Raiders (6-5), visits on Sunday night.Kansas City is 24-3 against division opponents since 2015 and has won four straight and 11 of 13 against Oakland.”The Raiders got to come with it (like) every other team,” said defensive end Frank Clark, who leads the Chiefs with seven tackles for loss. “I’m going to say that and keep saying it.”Home field not been so kind to the Chiefs, who stand 2-3 in Arrowhead Stadium this season. Coach Andy Reid, however, makes good use of bye weeks, standing 10-1 at home and 17-3 overall when resuming play, and the team was idle last week.The Chiefs were able to take some time off and as Reid put it, “decompress there a little bit and get healthy.”The capabilities of quarterback Patrick Mahomes are always foremost among any concerns, but he has shown no ill effects from a dislocated kneecap that kept him out two games and allowed him to heal a tender ankle.Mahomes, however, is coming off his worst passing performance as a pro in a full game, a 182-yard effort in a Nov. 18 win over the Los Angeles Chargers in Mexico City. Mahomes did add a career-best 59 yards rushing in that victory.Penalties remain an issue for a Kansas City offense that ranks tied for 23rd in red-zone efficiency.”We need to make sure we clean that up,” Reid said, “and that’s something we can do. That’s obvious.”Oakland had a three-game win streak, and an opportunity to tie the Chiefs for the division lead, shattered with a humiliating 34-3 road defeat last Sunday against the New York Jets.