I went to my first tournament a few weeks ago and two of my opponents ended up using the lockdown on me and trying for the electric chair sweep. Fortunately I'm crazy flexible so the position didn't bug me and I used half guard ezekiel threats to get them off of me. Since then I've been focusing on the lockdown, both defense and offense. I've noticed that when I get the lockdown people usually make a lot of space with their free leg to avoid the old school sweep. If I have the underhook I used this space to enter deep half guard, and if not I go for the electric chair sweep. For defense I usually just bend my knee so they can't stretch me out then go for half guard ezekiels to set up the pass. My question is mainly directed towards to more experienced grapplers; technically speaking are the set ups I'm doing going to be getting me in trouble when I'm going against higher belts (like Brown and Black). Also, what is everyone's general opinion of the lockdown? Personally I'm not really a big fan of 10th planet stuff, but I do feel that their stuff can be useful if they're part of your game, but not the entire focus of your game. Edit: one final question. Is the electric chair sweep/submission legal under IBJJF rules at white and blue belt?