He in fact unironically declared it his most important work. And I feel inclined to agree.

Here, a video on it:

https://vimeo.com/17116481

Here, the actual rules:

http://www.classwargames.net/wp-content/uploads/2015/10/THE-...

And here, an absolutely ingenious, book length elaboration on the game:

https://www.researchgate.net/profile/Richard_Barbrook/public...