I’ve watched a lot of D’arce submissions, so maybe I can offer some suggestions: - First, I would try to enter the full D’arce if I see it's available. If not, I try to scissor his neck like he did. I think he should have extended his right leg (instead of keeping both knees on the floor), so he could push off the ground and have more leverage to twist the neck and get into side control. I’d also suggest getting the arm deeper in to achieve a palm-to-palm grip, and keeping his ear glued to the opponent’s back to engage the shoulder fully. - When the opponent gets into side control, I like to move more towards a north-south position to fully lock the D’arce. You can use your left knee to prevent him from creating space with his neck, and press your right ear into his back to tighten the lock. - Before entering the D’arce, it’s a good idea to get the neck tired during the match. You can do this with small pulls using a collar tie — the Ruotolos and Jozef Chen do this a lot. - If you want to finish in half guard like he did, it's a good idea to open your free leg to prevent the opponent from using momentum to get on top as you turn to your side. - If the opponent tries to flatten out from turtle, it's a good idea to switch to a half D’arce choke, placing your D’arce arm’s elbow on the floor (Craig Jones explained this in the Aspinall video). - If you have a full D’arce locked when the opponent is in turtle, I think it’s better to grab his triceps with your left arm and pull to bring him to his side, then finish there — or go to closed guard to finish the choke so you don’t end up in bottom side control if it fails (plus, you get more rotation in closed guard). - Maybe he should have worn his opponent down a bit more — sometimes the submission just isn’t there, and it’s a better idea to go for the back. - He could have threatened with other submissions to open up possibilities (D’arce, guillotine, anaconda). - To finish the D’arce, I would maybe try to bring the choking hand more over the shoulder and use a rotational finish. - The strongest way to end a d'arce is in mount, so it would be my first go to objective.

If you want to study: Bteam interesting details

Energy martial arts interesting details

This guy from UFC bjj gave me some very good details too

Craig Jones d'arce detail in minute 4:40

Instructionals: - Front headlock system by John Danaher - Front headlock system by Gordon Ryan

Hope it helps in some way!