The system is not mine
The Sit-Up Escape System is by Jeff Rockwell, with Marshal D. Carper, published by Artéchoke Media. Everything the flowchart contains came out of their instructional. If any of this is useful to you, the original is what you should be paying for — it teaches the material properly, with video and photography, in the order a person should learn it.
I made the flowchart for myself, to review the system after I had already studied it. It is a map of a place you have been, not directions to somewhere you haven't.
Where to get the original
Artéchoke Media published it, and their shop page is the place to start:
artechokemedia.com/shop/sit-up-escape-system
Fair warning: I could not confirm it is still on sale. It was $44 as a cloud instructional, and it may simply still be there — but if that page is gone or the checkout does not work, contact Artéchoke Media, or Jeff Rockwell directly, and ask. Work like this sometimes stops being listed long before the person who made it stops being willing to sell it.
I have not linked, and will not link, the sites that offer it as a download for less. If you use this flowchart, buy the system.
The flowchart
One page: the core path down the middle, with the escapes and counters branching off it, and coloured lines where one branch hands off to another. It assumes the vocabulary — crossface, frames, the sit-up posture, Kesa Gatame, the Granby — because the instructional teaches it and I am not going to teach it worse.
The rough one
The first version was drawn in MS Paint, because that was what I had open. It is worse in every way and some people prefer that sort of thing, so here it is.
What it is good for
Review, after the instructional. Before a session, when you want the shape of the system back in your head in thirty seconds. And as an argument for the thing the book I am writing is about: a technique list is a pile of things to remember, and the same material laid out as a structure is something you can actually reason with.