Bridging with wrist locks:
I thought I would type this and hope it has dividends to the other readers. I won't have any picture examples because not may schools ever explore this option. but to give category pictures up front:
1) straddle
Mount (grappling - Wikipedia, the free encyclopedia)
2) kote gaeshi
Wristlock - Wikipedia, the free encyclopedia
go to "suprinating wristlock
3) kote mawashi (nikkyo in aikido)
Wristlock - Wikipedia, the free encyclopedia
go to adductive wrist lock
4) Kote hineri (sankyo in aikido) I couldn't find a picture of this wrist lock but here is a video of it standing:
YouTube - Sankyo (kote hineri)
As far as the applications of these for bridging the following I have found to apply:
1) You pretty much have to have a strong understanding of the wrist lock in general to make it work on the ground.
2) The locks when used in conjunction with a bridge won't result in a submission. The person being bridge instead will be encouraged to escape the lock by getting off of you.
3) Because the escape to the lock is to "de-mount" you the other normal pre-cautions like keeping them from posting a leg, or posting an arm, worry about his grapevines dont' really apply. You are using the lock to encourage him to get off of you by his own accord.
4) If he gets off of you (escapes) you will most likely lose the wrist lock.
kote gaeshi: This seems to work only if his hand is open. If it is balled up into a fist it is harder to work. I tend to get this when I have their hand resting on my chest or suspended in the air but find it much harder if their hand is in motion or resting on the ground. So for me the primer, of when this is applicable is 1) open hand 2) on my chest or in the air.
I take his hand and turn it over on my sternum and bridge in the same direction of the rotation so that my whole upper torso is aiding in the rotation of his wrist. What ends up happening is that the person getting kote gaeshi will either roll with your direction to take the pressure off of his wrist or will flip to his back ahead of your rotation for the same reason. You have to practice this sorta slow. You aren't gonna break anything because the person is not restricted from moving but spraining his wrist is a strong possibility of you rush this lock in training.
2) Kote mawashi . This is a wrist compression. I tend to only attempt it if his hand is on my chest, in the air but not moving (aka not punching) or if he is grabbing my lapel or wrist. It doesnt' matter if his fist is balled or his hand is open. I take his hand or wrist and place it on my chest in the wrist lock position and than sit up using my abs.
To escape this he can either free his hand from my grip or roll over one of shoulders. Most people even if they are attempting to free their hand will get up off you to take the pressure off their wrist. When they do I bump them with my hips as they rise and bridge. I almost always lose the wrist lock immediately when I do that. If they are able to stand before I can "bump them" but I still have their hand I will use my other hand to rebend their elbow by placing the blade of my other hand on the top of their elbow. As they move down from the arm bend I bump them with my hips and try the bridge again.
3) Kote hineri: I only attempt this if their hand is suspended or grabbing my wrist. It doesn't matter if the hand is open or closed. I take his hand in the wrist lock position and move it across my body. At some point he may post his other arm to keep from being dismounted. Either way if he isn't too strong I will put my other hand behind his elbow and push his elbow across while turning his wrist. If he has a lot of upper body strength I will keep a double hand grip instead. The object is to keep tightening the lock because it encourages him to either (1) roll off of you or (2) rotate off of you in the direction you are turning his wrist to take some of the pressure off.
If he rolls off you will lose the lock. He is rotates off you can keep turning the wrist to encourage him to rotate more and than either turtle to kneeling (or standing) of if he sits up as he rotates sometimes you can rotate up with him using the aikido shikko (Japanese knee walking) to complete the joint lock while kneeling. Not very likely though since he has plenty of chances to escape by getting off of you before than.
If you take the three wrist locks and put them together they represent three directions. If it is his right hand you are locking kote gaeshi goes to his right, kote hineri to his left and kote mawashi goes up and towards him.
