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Ed Zurga, Associated Press
Denver Broncos running back Lance Ball (35) runs between Kansas City Chiefs outside linebacker Justin Houston (50) and defensive end Glenn Dorsey (72) during the first half of an NFL football game at Arrowhead Stadium in Kansas City, Mo., Sunday, Nov. 13, 2011. Ball rushed for 96 yards in the game and the Broncos defeated the Chiefs 17-10.

ENGLEWOOD, Colo. — As the Denver Broncos fine-tune the playbook to fit Tim Tebow's game, they have become increasingly reliant on the ground game.

With the approach, they're off and running.

Relying on an unconventional option-style offense led by an unorthodox quarterback, Denver has suddenly surged back into contention in the mediocre AFC West. The Broncos (4-5) have won three of their last four games with everyone pretty much knowing exactly what they are going to do — run and run some more.

Not that it's mattered.

So unique is this read option — similar to what Tebow ran during his days at Florida — that teams are struggling to contain it.