[daveT]

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Not to sidetrack anything, but can someone explain 'martingale'?

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There are two variants. If you place a bet on RED at a wheel, you either win or lose. If you lose, you double the bet, and then continue doubling the bet. Your over-all expectation is decreased by the green numbers (0,00). I suppose that this could theoretically create a losing proposition if enough green numbers came up in a row.

$1 bet = $2win-$1bet= $1profit

if you lose:

$2 bet = $4 win- $2bet-$1bet = $1 profit.

There is also something called the Grand Martingale, which you double your bet and add one dollar. The math is simple.