Free online double zero roulette

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Like all betting systems, not only doesn't it overcome the house edge, it doesn't even dent it.

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Much like the Martingale, you can expect it to usually win small, but lose it all back and more when you reach the maximum number of losses. It basically a modified nine-step Martingale. The Keefer Roulette System is a betting system promoted in a book by the same name.

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