cant keep rubber guard for some reason....

I used to do that, too. Just use your right leg to try to sit them back down. I'd really play with the meat hook and the three triangle-type moves from there....um...what are they? Tepee, bolt cutter or something...and another. Just like any position; if you make it more offensive they have to concentrate on not getting choked instead of powering past your guard. I'm gonna work rubber guard this weekend, I'll tell you how I react to the stack on Sunday.

Thanks for reminding me!

Have you tried to use your free leg to push on their hip???

Try baiting them into the Carni. I used to pull that off with moderate success. It's a very high percentage move, I just didn't play with it much before satan ate my elbows.

big guys need crack head control, because they are strong like they are cracked out

Different things in jiu-jitsu work on different types of people. I'm about 5'10, 150lbs, and I found that half guards works great on big guys. It's much much easier to move your hips in half guard, and if they try to flatten you out, you can sweep them with their own momentum, and if they try to stay in position, work for underhooks and take their back. There are some good chokes you can do from half guard as well, so if you can't get the sweep or back, you have that option. That's what worked for me anyway...my "big guys" guard has turned in to me standing back up, or shooting way underneath their hips with half-guard. I found it was unnecessary struggle to try and keep someone with 100lbs on me from regaining posture when I could just swim under them.

Madness... I sometimes find arm triangles from the bottom halfguard position. It can be a little tough to finish from there so while holding on to the triangle I will then sweep them to gain top position.

Bawa posted a really cool sweep-bait to triangle from half guard a couple years ago that I have used with a lot of success. I usually maintain a strong lockdown from half and then work to the back or to truck position.

One of my favorites, I"ll try to describe...

Half guard, start with good half guard posture. If you are on your right side, you'll start this with your left arm. Your left arm goes across his neck, gripping his collar deep. Shrimp your body out away from him, and at the same time, reach under your left arm, grabbing the other side of his collar, and bring your top knee up into his shoulder nearest your hip. This keeps him from being able to block the choke. Squeeze the choke just like a cross collar from guard. If anything is unclear, ask, and I'll try to clarify.

Another one of my favorites, not a choke though, is simply shrimping out and coming up for a single leg. Instead of turtling and grabbing with just my arms, when I shrimp, I wrap my outside leg around his outside leg, and when I come up, drive into him real hard while I have a body lock. Works great to put him on his back. Just be ready to counter the whizzer.

one thing you have to work on alot when working with rubber guard is the squeeze endurance. the whole time ur in rubber guard you have to be curling down on ur opponent. sometimes thats not enough thats why you either go to crackhead control until they chill out or the double bagger which you can go through all the other steps all the way to kung fu. so if you have the flexibility double bagger is the way to go for control.

I also love to set up a arm scissor from MC. A lot of guys will think you are throwing a armbar or trying to set up a sweep and turn right into the scissor trap.
Another fun thing to try is once you get MC set up, lock it in really tight when they try to stack and shrug. Roll backwards. You will be very very surprised how many people do NOT see this coming. Going from MC to having someone in a high mount is a WTF sweep.

maybe they just got used to it. ask them why could they get out.

just some thoughts . I recently started training at a 10th planet gym. "10th planet springfield" I have noticed that keeping everything really tight is huge. With flexibility issuses also hipping out really makes it alot easier to play through the rubber guard paths. Another thing that imho is important is realizing that rubberguard isnt an end all guard, it is just one of the many guards that you can play, and alot of people get higher percentages from it, but being able to switch from different guard types is crucial.. once again ..imho.... stacking is one of the most effective and common ways to counter someone playing rubberguard....i may be lazy or a defeatist, but usually if someone has a pretty good stack i switch to some type of open guard variation. also try and advance through the path quickly...watch for hands on the mat...thats free new york, which again imho is way eaiser to settle someone down in new york than mission control....

i really don't buy into rubber guard too much. in mma people have tried. only to get a good pounding. maybe for competition it is good.
also it is not intended to hold people down for long, it is going into techniques right away. it is very hard to hold a decent grappler with a strong posture down.

are you serious? have you ever trained with anyone who could do it half decent? if your even close to my weight i could hold you down with no effort unless you actually have been doing rubber guard for 3 or more years then that would be harder but judging on what ur saying you have no clue what rubber guard is