Artemis BJJ (MYGYM Bristol), Can Sönmez, Bristol, UK - 14/03/2016
When moving around to north-south from standard side control, start by shifting your grip. You'll need to place one arm by their near hip. A useful tip from Braulio is to anchor your hand flat on the mat by their legs, elbow near their bum. If you instead grab their gi or their trousers, they will be able to follow you with their legs as you turn. If you put your hand in the way, that acts as a barrier, meaning you can scoot around but they can't scamper after you. Your other hand will normally wrap under their far shoulder, especially if you're looking for a kimura.
As always with top positions, you must make sure you are maximising the weight you're driving into them. Stay on your toes as you walk around, also establishing solid grips with your hands. Press your chest down to turn their head to one side: that is a good general rule of thumb from top position, as if you can turn their head to one side, it is tough for them to turn their body in the other direction.
There are numerous ways you can grip in this position, as ever. A common option is to basically flop your upper body onto their head, bringing your knees in. My personal preference is to move off to one side of the head, driving my weight onto their shoulder, my head low and pressing down, sprawling back with my legs.
You can also experiment with various grips. The most basic is probably grabbing under their shoulders and reaching for their belt, then pulling them in towards you. You could also try putting your elbows into their armpits, or maybe wrap up an arm, perhaps sliding your arm under the head. Another common approach is to have one arm over their arm, while the elbow of your other arm digs into their armpit.
Generally you want to keep your hips low, like in side control, but there are variations where you raise your hips, driving your weight through your shoulders. As Jason Scully over on Grapplers Guide mentioned, if they try that escape where they wriggle out and fling their legs over to take your back, raising your hips can be useful. You can then drive your forehead into their chest to stop them completing the escape.
The best place to learn about maintaining the north-south probably isn't BJJ: its parent art judo is much better at pins. In judo, the orthodox north-south is called 'kami shiho gatame', with lots of variations. For example, the above picture shows three options mentioned in an old instructional book from 1952, Higher Judo: Groundwork, by Dr Moshé Feldenkrais (not only a good judoka, but an engineer, physicist and founder of the eponymous 'Feldenkrais Method').
Teaching Notes: I seem to have forgotten to put this one up after Amsterdam, so I'm adding this a month later. Which also means I really can't remember if there was anything to emphasise after this class. I do remember using the north south transition as a drill in the next class. It's probably worth adding some kind of very simple submission in here, or something to beef it up. But meh, I probably had something to say along those lines: this is why I should update my training summary spreadsheet more often, as it highlights when I forget a lesson. ;)