There are so many different guillotine set ups around. You can place a guillotine from literally any position: mount, side control, back and also inferior positions such bottom side control, back etc…
Renzo Gracie black belt Karel ‘Silver Fox’ Pravec is a guillotine master and will soon release a detailed instructional on the guillotine on BJJ fanatics.
Here he shows how he sets up a very tight one hand guillotine as part of a transition.
Check it out:
Off With Their Heads – Learn The Signature Guillotine Choke From Black Belt Legend Marcelo Garcia.
Marcelo Garcia Teaches The Subtle Details Behind Locking Up The Neck and Finishing Fights With His Signature Submission System.