At the risk of sounding like a BJJ cruster, I actually remember when the ol' double elbow grind was the tried and true standard for opening a dude's stubborn closed guard. Mind you, this was back in the late '90's and in to the early 2000's, when the open guard was considered the new school fancy sh^t (and a berimbolo was still a sandwich or whatever).
Back then, the closed guard was much more prominent, even among the higher ranking belts. Now, in 2013, I'd dare say it's rare to see a match go the distance with both players employing mostly closed guard. Advancements in open guard techniques, passing techniques and submission defense from closed guard have made the closed guard less and less popular to work from (and to maintain, if you choose to employ it).
Still, for beginning and intermediate grapplers, the game of closed guard versus closed guard passer lives on. And, when you want to work techniques from closed guard, you still need to defend that loathsome elbow grind offensive attack from an opponent. So, thanks Stephan Kesting. Let's do this.