If this bet wins and the bet amount is less than the element on the right end of the list, then subtract the amount bet from the right element. If the player's bankroll is greater than zero, but not enough to cover the the sum of left and right elements in the list, then bet the remaining bankroll.If there is only one element in the list, bet that.Go back to step 4, unless every element has been crossed off the list (success) or the player's bankroll is exhausted (failure).If the player loses the bet in step 4, then he will add a new element to the right end of the list consisting of the amount just lost.If the player wins the bet in step 4, then he will cross off the left and right numbers on the list.The player will bet the sum of the left and right numbers in the list on an even money bet*.The player will write down the quotient from step 2 ten times, horizontally.The player will divide his winning goal by 10.The player will define his winning goal and bankroll.While this is true, a bad string of losses can causes bets to increase quickly, sometimes exhausting the player's bankroll. Believers might say the Law of Large Numbers states that the more bets are made, the more the ratio of wins to bets will approach the expected ratio. The logic behind the Labouchere is that the player needs to only win 1/3 of the time (and not run out of money) for the system to work. Like most betting systems, it usually results in a session win, but at the expense of huge losses when it doesn't. It entails writing a list of numbers and then crossing off two after a win and adding one after a loss. It is generally played on even-money games.

The Labouchere (also known as the cancellation and split-Martingale) is a well-known betting system.

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