Tarvaris Jackson had a perfect passer rating in Friday's preseason game against the Chiefs. "He was able to create a couple of things with his athleticism, and then obviously you saw his arm strength in throwing that ball [64 yards] to Darius Reynaud, so, he might have just relaxed and played," Vikings coach Brad Childress told the Star Tribune of Jackson. Jackson went 12-for-15 for 202 yards and two touchdowns against Kansas City. He's fighting with Sage Rosenfels for the right to backup Brett Favre in Minnesota, that is, if the Vikings don't trade Jackson. "[Jackson and I] talked before the game and I said, 'Look, you're going to play with the [first-team] offensive line and the [first-team] wide receivers, make the most of it.' ... So, he did make the most of it," Childress said. "You know what, we've used a couple of quarterbacks here -- we've used two in every year and sometimes three [I've been here], so, they whack those guys pretty good, and, you want to have good ones."