[Kansas City.com] The Chiefs have many frustrating thoughts to ponder from Sunday’s 28-20 loss to the Chargers, but none dug deeper than this: They left a lot of points on the field in what turned out to be a close game.

In the third quarter, the Chiefs had a first down at the San Diego 11 but came away with no points after Trent Green fumbled.

In the fourth, the Chiefs had a first down at the 10 but settled for a field goal. Later, they had a second down at the 3 but eventually came up empty after losing the ball on downs.

“We lost by eight,” fullback Tony Richardson said. “We were down there two or three times. If we could have converted one or two of those, it would have been a lot different situation.”

The second-half red-zone problems were even more puzzling because the Chiefs moved the ball so well otherwise. They had 306 yards after halftime.