The player would tap one switch each time the ball completed a full spin, and the other switch each time the wheel spun. From that data, a small pocket computer could calculate the odds and let him know, via a tap on the leg, where he should place his bet. All in the small window of time before the ball stops spinning.

What is the most successful roulette strategy? While there is no strategy that can guarantee a profit in the long run when playing roulette, the Martingale betting system is often regarded as the most successful strategy. It is easy to use and can provide good returns.