Nami juji jime is also called a cross collar choke. This is technique number 28 and 29 on Pedro's blue belt tapes. It works by cutting off the blood supply in each carotid.
First grab deep in his opposite-side collar with your 4 fingers on the outside and the thumb on the inside (palm-down). When inserting your hand, tilt your wrist so your thumb goes flush against his neck. Watch for the bridge, so don't attack his collar straight on. Instead, lean to that side for stability.
Do not squeeze you hand very hard before you get the second hand in. This hand is easy to insert, but squeezing too soon takes the material from the second hand and makes he harder to grip and execute (i.e. too tight to actually choke him).
If you have trouble getting under his chin, bring your elbow towards his stomach and then back up (but keep it flush against his chest). This wedges his chin up and makes space for the second grip.
Your second grip goes over top of your other arm, and you grip with 4 fingers on the outside too. When the second hand goes in, loosen both your grips then dig them back in to re-tighten them. Both hands pull swiftly. This makes the lock much tighter.
Bring your head to the floor on the side with your second grip. This gives you more stability to prevent the roll, and it brings your full weight onto him.
Tighten the lock and press your wrists into his neck.
Bring your elbows to your sides (like in karate when going to a horse stance). This brings his head to you to make it tight. Never choke from far away, always choke as close as possible. Pinch your shoulder blades together for more pressure.
Tap!
A lot of guys give up on it though when the guy tucks his chin, even if they have a good deep grip on both lapels. There are several ways to get under his chin if you have problems.
Bring your elbow towards his stomach and then back up (but keep it flush against his chest). This wedges his chin up and makes space for the second grip.
Fabio Santos teaches to "shuck" your opponent when he tucks the chin. In other words, pull him in a little and then quickly straighten your arms and pull him back in again to finish. Its almost like you're trying to give him whiplash, but not quite that violent (unless it needs to be). When you pull him in and then quickly push him away and pull him in again his head whips backwards and his chin lifts. Your forearms then fall into place and its easy to finish the choke.
Aesopian likes to "shake the baby." You just giggle him to loosen him up. Shake your grip in little bursts and you'll inch in. He picked it from from watching Ralek (or maybe Rener) Gracie and Rafael Lavato Jr. get collar chokes in competition. They both went for palm up, palm down chokes from mount and had the guy tuck his chin to defend the second hand. Then they just shook the guy, bam bam bam, bam bam bam, until his their wrists worked in. He laughed out loud the first time he saw it since their opponents heads were literally bouncing off the floor.
You can also fake the arm attack, which usually causes your opponent to loosen up. You go for an armbar at one side, shifting your weight. When he defends, insert your first grip to get the choke. This works in reverse too: you can use the choke to set up an armlock.
When doing kata juji jime, you do exactly the same except your first hand grips with your 4 fingers on the inside.
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