About that "Family edition" — the folks at "The Amazing Race" are really sorry and they promise never to let it happen again.

And, true to their word, TV's best reality/competition show returns to its routes tonight (8 p.m., CBS/Ch. 2) — two-person, not four-person teams; lots of international travel, and challenges that are actually challenging.

The talking point they're using at CBS seems to be — we tried something, and it didn't work. Sorry.

Which is believable, because the "family edition" that aired last fall turned off a lot of viewers and lagged in the ratings.

"You know, we tried something," said CBS Entertainment president Nina Tassler. "I don't think we were particularly successful with it, but the interesting thing is, sometimes you get criticized for not experimenting with a form. In this case, we did."

Those were comments echoed by "Race" host Phil Keoghan.

"We tried something. I'm really proud that we tried something, because I think if we hadn't tried to change the race, people might have criticized us for not being adventurous and doing something different," he said. "I'm proud of what we managed to pull together, but there is no denying that the race is most successful when it has less faces, more places and teams of two racing around the world," Keoghan said.

Whereas the "family edition" stuck mostly to the continental United States, "Amazing Race 9" takes off immediately. The 11 teams begin in Colorado and quickly make their way to Sao Paulo, Brazil.

Over the course of the competition, the teams will race to five continents, covering 60,000 miles in 29 days. Season 5 covered more than 70,000 miles, but this is "the most miles we've done in the shortest amount of time," Keoghan said. And the compressed shooting schedule "does have a dramatic affect on the teams, because it's obviously more taxing."

"It was definitely tougher on the teams than a lot of the other seasons. And I think a lot of that had to do with the fact that we got the message from people that they wanted an international route, that they wanted the race to go back to the teams of two, that they wanted more exotic, more adventure, that they wanted to push the people more."

And, of course, part of the fun is watching how the teams react to the stress. Before tonight's two-hour season premiere is over, there are already contestants who are stressing out — and contestants who aren't making a particularly good impression on either the people they encounter or viewers.