Anyone have pointers on breaking closed guard? In particular, my instructor has been working with us on putting the knee into the tailbone of the guard player and using that to "get long," pressing backwards to put pressure on the closed guard and working with elbows on the guard's thighs to open the guard up. My problem is that I always seem to have the guard's tailbone slide back up onto my thigh as I start to press backwards, which relieves all the pressure of me pushing back and totally negates the technique. I feel like I am really mashing down on the guard's hips with all my weight, which should be stopping this from happening...but obviously I am doing something wrong. Any tips on how to fix this or alternate approaches to opening the closed guard would be appreciated. Thanks!