[gringochileno]

Problem with doing it with 10 girls is that then you have to spend time learning all the information you want to use about each one of them and do it well enough that you don't mix them up. If you can make it work then more power to you, but it seems like way more time than I'd be willing to spend just to improve my odds on a handful of approaches (remember, you could end up approaching these girls anyway if you just went to the same spot and went in cold without any prep work).