How to get a cat to try a new kibble?

My 2 cats are being switched from purina to authority and I did the switch properly the thing is one of them won't eat the kibble unless it was mixed with the purina kibbles, the other cat who is usually picky quickly accepted the switch to the new food (surprisingly) but the other cat who will ANYTHING doesn't like it. The bag is good until November 2013 so I know it's not spoiled or anything. I know nothing is wrong with my cat since she just inhaled some of my rice that I left on the counter (I shooed her away and most of the time food isn't left out like that)

I'm not one of those people who panics when my cat refuses to eat a new food. I simply leave the food down all day and they get nothing else not even treats or wet food when they are being picky only the new kibble. Then at the end of the day I pick up the food and put it away until the morning then the process repeats itself. During their picky phases they would be "banned" from people food (they usually will eat both cat and people food and won't snub one over the other so that's why they are allowed to eat it) treats, and basically given the cold turkey method. With the cat food brand I went with chicken because they are familiar with that kind of meat and like it most.

I was wondering if it would be ok to fast them for a day to build up their appetite for it. They are constantly chasing eachother so they are also building an appetite that way. I also do play with them. Any more tips??? :)