By the way, the kimura is one of those SNEAKY submissions that most Jiu jitsu players tend to not use. it is commonly used in Vale Tudo events by Japanese ex-pro wrestlers. Kazushi Sakuraba, Rumina Sato, Chris Brennan and Karo Parisiyan are a couple of people known to be able to apply very good kimuras.
SITUATION Justin is in my guard and has pretty good base. In order to apply anything, I would have to alter that base.
STEP 1: FIND A TARGET
I need to get an arm on the ground and near me to grab. To do this, I push my hips up and try to climb higher on Justin's back. This applies pressure to his back and forces his base towards me. (this is a good way not to get punched as well.) As you can see,by even a slight raise in my hips, I have already forced Justin to start sprawling forward.
STEP 2: ACCQUIRE TARGET
Justin has posted his left hand near my head in order to prevent him from rolling off and me reversing the position. Now, I can attack that arm. I do this by using my right hand to grip him on top of his left wrist, right above his hand. As soon as I secure this grip, I reach over his shoulder and trap the arm.
STEP 3: CONTROL TRAPPED ARM
To prevent Justin from overpowering me and just pulling his arm out, I grab the outside of MY right wrist with my left hand. I then lie back (holding the trapped arm close to justin's body) and force justin forward towards the floor as much as I can. IT IS INTEGRAL TO MAKE SURE THAT YOU KEEP THE HOLD TIGHT AND YOU MAINTAIN PRESSURE BY KEEPING THE HOLD CLOSE TO YOUR OPPONENT'S BODY.
STEP 4: COMPLETING THE HOLD
To complete the kimura and secure a submission, I scoot my hips out to my right (because that is the hand that I'm using to apply the kimura.) I then produce significant pressure on Justin's shoulder by A)Pulling the trapped arm close to ME. and B)Forcing his Wrist towards his body and up to the ceiling. It is possible to imagine that I am forcing his shoulder down towards the ground but this is decieving because the shoulder is what is trapped in actuality and therefore a tremendous amount of pressure is being applied to that area.
So there, a more accurate representation of the kimura. Please be careful when applying this as well as any other moves because with proper leverage it really doesn't take much strength to hurt someone pretty bad. Keep in mind this can be applied from various positions even! Standing, your back to your opponent, even from a sidemount (which I may illustrate later.)
The hand grip for a kimura is a very powerful hold as you are using two hands to control one ARM in a very dynamic way. Especially when you are standing up, the momentum of someone in this hold falling to the ground can be very explosive. A good hand grip to know as it will help you control your opponent (whether the control is true or false) for a suitable amount of time to rationally defend yourself.
Good stuff really.