I have been researching conservative labby methods and many online discussions make reference to French roulette scientist Billedivoire's book, Jouer et gagner, where he has, apparently, one of the best ways to run a labby. The book came out in 1929. Unfortunately, I can't find his book for sale (I don't read French anyway) or method online anywhere (figuring that if it was that good, as posted in a book, that many people would be using it.) Has anyone read the book or know the theory behind his system? The closest that I got was one post saying that his method was similar to a 10X4 labby. Thanks in advance for any help. If I find something, I'll share it out.