I was hoping to spend 6 months in Thailand this year. As I understand it, you can do two border bounces per year to achieve this. I wanted to spend two months in the South, and four in the North. Unfortunately, I messed it up, did a border run in the South, but only stayed for a week before leaving. Then had to do an emergency border bounce from Vietnam to BKK, to extend my stay in Vietnam, and was only in BKK for a couple of hours. So I've already technically entered on Visa exempt twice this year. How likely will I run into trouble if I try to enter Chiang Mai next month, and bounce once from Chiang Mai? Would it matter if the entries are in different passports? The first two are in one passport and the other is in another.