X: I'm fairly tall and lanky and tend to pass x guard by controlling the pant cuff (or as near as I can get to it) on the butterfly hook, then back-stepping to reverse KOB. Like most things in BJJ, it helps if you can catch it in transition rather than waiting until you are stretched out.
Deep half (for reference, "top hand/leg/etc." = near head, "bottom" = near stomach/hips): Having trained with a lot of high-level DHG players over the years, top DHG has become one of my favorite positions in BJJ. I assume that once I'm there, I'm getting to the back, crucifix or least passing. Getting the underhook is nice, as is getting to the position shown in the video that Uchi posted. My first choice, though, is to get a kimura grip or an over-the-shoulder wrist grip - meaning, the same grip I would use to trap the wrist of the non-choking hand if I'm on someone's back, if that makes sense. It is usually not very difficult to get. When I'm unable to get it, it's typically because my opponent has either quickly gone to something else, like a waiter sweep, or has escaped their head out the back door (in which case you slide to reverse half guard, make an underhook on that same side, step over to the other side and pass w/ knee cut). Even if your opponent is hiding their far arm under your trapped leg a la Ryan Hall, it is very difficult for him/her to keep you from making a tiny amount of space between that arm and their body. Hell, I'll pin the wrist with my bottom hand and just be satisfied with that. Frankly, if he doesn't hide that arm and instead hugs your trapped leg, it's ALWAYS there. You can underhook first and then shoot your top hand over their shoulder and through, or pull up on his far elbow to create space and then shoot it through...however you get it, just get it and keep it.
After making this grip, kick your top leg (the one nearest your opponent's head) back and lay on your hip near their head. If you just pinned the wrist like I mentioned, you need to loop your top hand through for the kimura or wrist grip on your opponent's far arm. Keep it tightly connected to their ribs on the far side. If you've made it this far, your opponent is about to have a bad time.
If...
...his near arm is still wrapped around your leg, bring your leg (the one your kicked back) closer to his ribs and use your instep on his thigh to free your trapped leg. Voila! Crucifix.
...he brought his near arm out, bring your knee (of the leg you kicked back) to his head, pull him up into back control. This is probably the easiest scenario, but I prefer the crucifix. Sometimes your opponent will bring his arm out and immediately bridge and try to roll away from you, but this makes it even easier to get that second hook in.
What can make this difficult is if your opponent is gripping your untrapped leg with his/her top arm. If that's the case and I don't think I'll be able to kick that leg back, I will typically go knee to the mat (the position in Uchi's video).
