Nearly a half-hour after the starters were replaced Sunday in the Chiefs’ 45-10 drubbing of Washington, right guard Geoff Schwartz was still smiling.

The fact that the Chiefs had just snapped a three-game losing streak certainly had something to do with this — as did the fact that he had just turned in another strong effort, his fourth in a row since being inserted into the starting lineup.

But in the cramped quarters of the visitor’s locker room at FedEx Field, Schwartz was not talking about the latter. No. All that really mattered was that, in icy conditions that practically begged for power football, he and his fellow linemen had risen to the occasion by consistently winning the battle up front and paving the way for running back Jamaal Charles’ season-best 151-yard performance.

“We knew that we were going to get called on, in these conditions, to run the ball,” Schwartz said. “And I think we did a pretty good job.”

In the middle of that effort, was Schwartz. According to Pro Football Focus, a site that grades every player in every game, the 6-foot-6, 340-pounder turned in a run-blocking grade of 2.1 (anything 1.1 or higher is considered to be good). He also had a season-best overall grade of 3.1 in the game, making him the only Chiefs lineman to grade out at 1.2 or higher in four consecutive games this year.

Throw in the fact that Schwartz, 27, has played only 386 snaps this season yet still boasts an offense-best overall grade of 13.1 — which tops even Charles’ season-long grade (12.5 in 789 snaps, mind you) — and it’s easy to understand why Chiefs coach Andy Reid elected to keep Schwartz in the starting lineup Sunday, though the man he originally replaced four games ago, fourth-year pro Jon Asamoah, wasn’t listed on the injury report before the game.

“He’s done a great job stepping in,” center Rodney Hudson said of Schwartz, a six-year pro.

It’s not as though the man Schwartz replaced was performing badly.

Prior to his shoulder injury, Asamoah was one of the Chiefs’ best linemen according to PFF, and his grade of 7.0 is still the third-highest among all Chiefs offensive linemen. Only Branden Albert (10.0 in 800 snaps) and Schwartz have been better.