In the largest sense, they've been referring to the entire season, but in a smaller sense, they mean games, drives and even individual plays. Reid could have kicked a field goal to get within 10-9 at the break, but instead had Jamaal Charles run over left tackle. [...] perhaps more crippling, they had to resort to a trio of field goals when drives stalled in the red zone. Other times, I felt like we flowed and were moving the ball, staying on schedule, ahead of the chains, but then in the red zone we would have a negative play, a sack or something, quarterback Alex Smith said. Kansas City closed to 17-9 on Cairo Santos's third field goal early in the fourth quarter, but its defense softened. The Steelers chewed up six minutes before kicking a field goal, making it a two-possession game and giving the Chiefs little chance of mounting a comeback. The Chargers, who lost to the Chiefs on a last-minute field goal earlier this season, will show up at Arrowhead Stadium with just as much desperation. [...] if the Chiefs' playoff picture is hazy at best, the Chargers' couldn't be simpler: