There are lots of ways to finish once you have a triangle locked in (the hard part is getting the triangle and then keeping posture broken down to lock it up). Once everything is locked up concentrate on getting the proper angle. We like to underhook the leg thats on the opposite side of the feet and then squeeze our knees together. See this vid for example:
or
http://youtu.be/H_ef50oEO4w?t=2m7s
This usually does the trick but if not you can always attack the arm that is stuck inside the triangle (either straight armlock or kimura).
Ex. of switching to a straight armlock:
http://youtu.be/eUyR5YOFY4A?t=3m55s
Worst case, if you cant finish either (and this a little dirty for teamates but perfectly acceptable for tourneys) Make a fist and push into the artery on the neck right next to the arm that is stuck in the triangle. Take you other hand and pull up (or down if your on bottom) on the head. Thats usually a quick tap. Hope this helps!!
or
http://youtu.be/H_ef50oEO4w?t=2m7s
This usually does the trick but if not you can always attack the arm that is stuck inside the triangle (either straight armlock or kimura).
Ex. of switching to a straight armlock:
http://youtu.be/eUyR5YOFY4A?t=3m55s
Worst case, if you cant finish either (and this a little dirty for teamates but perfectly acceptable for tourneys) Make a fist and push into the artery on the neck right next to the arm that is stuck in the triangle. Take you other hand and pull up (or down if your on bottom) on the head. Thats usually a quick tap. Hope this helps!!