If you are in turtle and they have an arm over your back in an underhook. You have hands across the chin to prevent chokes. You can lock their arm with your bicep and roll pulling them over your back. This will land in side control. Block their knees with your hands, back your butt into their shoulder, rolling them onto their side. Reach the arm closest them under their chin, and continue rotating your butt around so your around 90 degrees to them. grip the back of their head with your bottom arm. Bring other bicep to the hand on their head and grip the bicep. Squeeze the darce = win.
From the other position, controlling them in turtle, you can rest an arm over their neck, and bring the other arm under their chest to clasp in the gable grip, from here you can maneuver to the darce