1. Get Peterson going: The Texans have the NFL's fifth-best run
defense, but Adrian Peterson ran for a combined 209 yards in
games against the league's first- and third-best run defenses.
He'll have to be strong again Sunday, Dec. 23, both to keep his
chance at Eric Dickerson's single-season rushing record and the
Vikings' playoff hopes alive.  2. Account for Watt: Houston's
J.J. Watt is tied for the NFL lead in sacks, and as a defensive
end in a 3-4 scheme, he's done it from an unusual position. The
Texans move Watt around their line frequently, but he'll often
be matched up against right guard Brandon Fusco, who has
struggled this year. The Vikings can't let Watt take over the
game.  3. Stay balanced on 'D': Houston has the third-best
offense the Vikings have faced this year, but unlike Detroit and
Washington, the Texans have both an elite running back (Arian
Foster) and top receiver (Andre Johnson). The Vikings can't
afford to emphasize stopping one over the other, and they'll
need their secondary to be be