Originally Posted by IronMan
The top one is just an inverted armbar. You can do it from guard too, if your opponent puts his hands above your shoulders. I've found it's particularly effective if he misses a punch.
The bottom one is Bas' variation of an armbar from sidecontrol. He's doing an elbow tuck armbar, which increases leverage, but makes it a little bit harder to get, because you're not hooking the elbow. His positioning is also pretty wierd on the technique, I'd never attack a submission from that position, but I'm not Bas.
Personally, I have found that both armbars, near and far side armbars, are really good, because most newcomers to jiu-jitsu and most MMA fighters who are just getting started don't think about them from that position, they are just worried about the shoulder locks (americana, Kimura, etc.) which also makes the straight, pinned version of the inverted armbar effective too.
Now that I look at the bottom one, I see that the version I know is a little different. We do it with the elbow hooked.
These armbars also--almost--work against more advanced grapplers when they know that I'm a white belt. I won't say that I managed to submit a brown belt, but he was REALLY surprised that I knew far side armbars. I laughed... then he escaped and submitted me 4 times, but it was funny for a minute.
I guess my point in my posts is that having a series of 6 or more submissions at your disposal from side control increases your chance at locking in the submission that started this thread. I got a leg kimura again (I think that's 4 now) because I had my opponents far-side arm isolated and was defending against submissions on that arm. He was trying to free up his other arm, I quickly popped it into position, lifted his head, and it was over.
BTW... if anyone is interested, Bas' book is posted somewhere on this site. If you search for it you should be able to find it. I love it, but unfortunately, he doesn't name anything, so you may know 10 armbar variations, but you'll have no idea what they're called.