This happened to me a few months back and I wanted to get other people's opinions on it. I was in a bookstore and saw a book by a guy who has written books on grappling, conditioning etc. So I looked at it and saw how the guy advocated using a guard that looked like a figure four, instead of crossing the legs further down, he stuck his ankle under his opposiite side knee and held the guy in that guard position. So I told my instructor at the time and we tried it and it seemed like it would be a big mistake to ever use this kind of guard. It is incredibly easy to get a leg lock on a guy using this kind of guard, you don't even have to lean back. I freely admit I didn't read the whole book, maybe we were doing it wrong. Is this as bad an idea as we found it to be, or maybe we just didn't know how to pull it off?