I just love thinking about roulette but I hardly ever play it. One of my favourite books is called 13 against the bank and claims to be a true account of a pommie bloke who trained 12 other people to play in a team of six and do a sort of "reverse martingale" whereby he lets the casino constantly win small amounts off him until the casino hits the inevitable run of outs and he increases his bet with each win until he hits the table limit and then goes back to minimum bets. He needed six people so they could cover each even chance (red, black, high, low, odds, evens). This means they were betting against each other so-to-speak but if a bias occured to one of the six chances that person would be making lots in big bets while his counterpart on the opposite even chance would be steadily losing small amounts so who cares? The fun part of the book is all about the tensions in the team and the hostile response of the casinos. Great read. You could test out the theory on paper but why let the truth get in the way of a good story? Cheers!