I applied to 2 specialties, one extremely competitive, the other not competitive at all as a back up. For the uber-competitive specialty, I applied everywhere, but only received interviews from the region of the country I live in, as I predicted would happen since location is used as a screener for this field. For the less competitive specialty, I chose cities that I've always wanted to live in - that is big metropolitan cities with a lot going on, and I got almost every interview I wanted. I didn't double apply at any hopsital out of fear that I'd be caught, but in retrospect, I don't think it would have mattered. So on match day hopefully it will be a win-win situation. I'll either get either the specialty I wanted or the city I wanted.