Rookie De'Anthony Thomas sparked the Chiefs with an 80-yard punt return for a touchdown in the first quarter, the first of five touchdowns, in a 41-39 win over the Bengals in the 2014 preseason opener at Arrowhead Stadium.
Alex Smith went 3 for 5 in his three series for 19 yards while losing a fumble on a sack.
With major questions surrounding the secondary, Sean Smith and Malcolm Bronson took interceptions back for scores. Smith, who delivered a 36-yard return, entered the game behind Ron Parker at the corner back position. Parker and safety Daniel Sorenson were beat by Bengals No. 1 wideout AJ Green on the first series for a 53-yard completion.
Entering the second series, backup quarterback Jason Campbell connected with Brandon Tate on a nine-yard touchdown strike against the Chiefs' defensive starters. Campbell connected on another touchdown toss to Dane Sanzenbacher late in the second quarter.
Chase Daniel took over Kansas City's offense in that same frame with a 17-10 lead. He started slow, firing a ball right to Dre Kirkpatrick, who took it 40 yards up the Bengals' sideline for a score.
Driving late in the first half and down four, Daniel found tight end Travis Kelce over the top for a 69-yard touchdown strike with 21 seconds left in the first half. It was Kelce's first touchdown with the Chiefs after a knee injury robbed him of the bulk of his rookie campaign.
Daniel connected on 8 of 10 passes for a game-high 126 yards.
Aaron Murray got limited snaps late in the fourth quarter while trying to overthrow Tyler Bray for the third string quarterback job. He misfired on his one pass attempt on third down.
Bray completed two of three pass attempts for 37 yards, while the bulk of his time was spent handing off to Cyrus Gray. The third-year Chief carried 10 times for 55 yards, including a two-yard touchdown plunge with 7:03 left in the fourth quarter.
First-round draft pick Dee Ford recorded two solo tackles and two hits on the quarterback.