"Through something less than intense film study, Romeo Crennel found a theme to the Chiefs' offense when inside the opponents' 20-yard line."The fact we haven't scored," said Crennel, the Chiefs' interim head coach, "that's the common thread." Wasted chances in the scoring zone have been a season-long problem for the Chiefs. They've found the end zone just 12 times in their 36 trips, and that 33.3 percentage is worst in the league.It's the biggest reason the Chiefs are next to last in the NFL in scoring and why, at 6-9, they're playing for nothing but pride in Sunday's season finale against the Broncos in Denver.The problem is even worse in their two games with Kyle Orton at quarterback. The Chiefs have just two touchdowns in nine trips inside the 20, or 22 percent.They were able to survive with just one touchdown in five trips inside the 20 against Green Bay because they got four field goals from Ryan Succop. But their one-for-four performance in last week's overtime loss to Oakland was more damaging.One sequence in the second quarter, as it turned out, wound up knocking the Chiefs from playoff contention. From the Oakland 13, Dwayne Bowe dropped a pass in the end zone, and on the next play Orton threw an interception."