Hi Matthew,
I used to be a cardrunners member when you made videos there.
(By the way I have already purchased this book but gave it to the charity shop/goodwill. I will be repurchasing if applicable.)
I remember in a/some vids you did some 6max theory eg (paraphrased, and if I remember kind of accurately) the BB wants to defend x% however built into x is the SB, BTN...'s ability to defend means x is lower than the theoretical number.
Coincidentally I am @ the stage of my poker learning so want to really interrogate this theory now:
i) is the maths in this book?
ii) if no, where can i find it?