Half guard has been my go to game for some time now. My lockdown is tight as shit (it really aggravates most guys I roll with), my whip ups are nice and strong, and I can pull off Old Schools and Electric Chairs pretty well (even Apollo Arm Triangles). But the problem is that I can only do well from half when my opponents posture is broken. When it is broken I can use the lockdown to stretch and the whip up to off-base them and keep my neck out of choking range. My training partners have figured this out though and immediately posture up once I pull half guard, basically daring me to come up and meet them. On inexperienced guys that's no problem; I'll still sweep 'em all day. But against the more savvy, I literally get guillotined about 90% of the time, and overall, this is where I get submitted about 60% of the time. I really need suggestions about how to either avoid the guillotine or how to break their posture while maintaining the lockdown because I'm currently training for a NAGA tourny and am desperately counting on my half guard game.