Gracie Barra Bristol, (BJJ), Can Sönmez, Bristol, UK - 02/08/2012
There are two basic types of mount to choose from, which I'll call low and high. Once you've achieved mount, I find that low mount provides the most control. First off, you want to immobilise their hips, as their main method of making space is to bridge up forcefully.
Bring your feet right back, threading them around their legs to establish two hooks: this is known as a grapevine. Alternatively, you can also cross your feet underneath, which has the advantage of making it much harder for them to push your hooks off. Your knees are ideally off the ground, to generate maximum pressure. How far off the ground they are depends on your dimensions: the key is getting loads of hip pressure.
Thrust those hips into them, using your hands for base, where again you have a couple of options. Either have both arms out, or put one under the head while the other goes out wide for base. Keep your head on the basing arm side, loading up your weight there. If they're bridging hard, you can switch from side to side.
A basic escape is to trap an arm, bridge and roll. So, don't let them grab your arm and crush it to their side. Instead, swim it through, like Ryron and Rener demonstrate in the third slice of the third lesson in Gracie Combatives. Be sure to do it one at a time, or you may get both arms squashed to your sides.
You can also turn to what’s called technical mount if they roll to either side. I didn’t go into too much detail on that, as that’s a whole other lesson in itself (which I last taught in conjunction with s-mount), but it is worth pointing it out as an option at this stage. I included the basic drill where you turn from side to side in the warm-up.
The drawback to the low mount is that there aren't many submissions from there: the ezequiel is one of the few high percentage attacks. In terms of their defence, they are mostly going to be trying to unhook your feet, so you'll be battling to keep those in place.
To attack, you're better off climbing further up, into high mount. Again, you need to worry about their hips. To control them, put your feet by their bum, tucking your toes underneath: Roger Gracie points this out as of particular importance. In what you might call 'middle' mount where you're still over their hips, Saulo suggests that you 'ride' their bridges, like you were on a horse. Lean back, then as they bridge, lift up: you’re aiming to move with their hips, rather than just leaving a big space. So, this takes a good understanding of timing.
He also recommends against leaning forward, as he feels that gives them more space and leverage to escape. Hence why he leans back instead. Experiment, seeing how holding the head works for you versus leaning back. I think Saulo’s method requires more experience, and personally I feel unstable there, but as ever, I want to offer students choice whenever possible.
The danger of leaning back is when you're facing somebody with flexibility and/or long limbs. They might be able reach their legs over to kick into your armpits, either sliding out through your legs or pushing your over. You must control their hips with your feet, to prevent them from bending their body. Swimming the arms through might help you out here, this time against their legs, depending on how they attack. If they do get their feet in place, I generally grab on the back of their collar, stay really low, then attempt to gradually work my hips back to flatten them out: that worked for me last time it happened.
Another option is to move off their hips, shifting into an even higher mount. Gradually walk your knees into their armpits (pulling on the top of their head may help) being careful of the elbows. If they start to work an elbow into your thigh, twist to one side and raise that knee. Pull their arm up with whatever you can grab, then reinsert your knee.
A final thing I wanted to mention, from Demian Maia, is that you can also use the cross-face. If they turn on their side to get their elbow back in, you can use the cross face to bring their head out of alignment: moving them with their head is easier than trying to move their shoulders or arms or whatever. Also, the body follows the head, so they are going to have trouble bridging or turning if you've got a solid cross face.