Intuitive analysis for Martingale
When the expected value of the stopping time is finite (which is true in practice), the following argument explains why the betting system fails: Since expectation is linear, the expected value of a series of bets is just the sum of the expected value of each bet. Since in such games of chance the bets are independent, the expectation of each bet does not depend on whether you previously won or lost. In most casino games, the expected value of any individual bet is negative, so the sum of lots of negative numbers is also always going to be negative.
The martingale strategy fails even with unbounded stopping time, as long as there is a limit on earnings or on the bets (which are also true in practice).[1] It is only with unbounded wealth, bets and time that the martingale strategy can succeed.
References
- ^ a b Michael Mitzenmacher; Eli Upfal (2005), Probability and computing: randomized algorithms and probabilistic analysis, Cambridge University Press, p. 298, ISBN 9780521835404
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia.
Introducing Live Betting
As opposed to conventional online sports betting, live betting is a system in which the odds change during matches according to the score. Here is a quick example from the NBA: if you are watching a Lakers-Clippers game, the betting odds before the game would obviously favor the Lakers, but if the clippers open a big lead at halftime, the odds may change accordingly, to reflect the fact that Clippers chances of winning have increased significantly. The same is true to football and other sports as well. Live betting can be a whole lot of fun, but you should be sure to read about the betting system on any site you bet at, and make sure you understand the rules before placing a wager.
Betting exchange controversy
The fact gamblers can now lay outcomes on the exchanges has resulted in criticism from traditional bookmakers including the UK's "Big Three" - Gala Coral Group, Ladbrokes and William Hill. These firms argue that granting "anonymous" punters the ability to bet that an outcome will not happen is causing corruption in sports such as horse racing since it is much easier to ensure a horse will lose a race.
Exchanges counter that, while corruption is possible on any gambling platform, the bookies' arguments are motivated not by concern for the integrity of sport but by commercial interests. Exchanges also assert they are well aware of who their customers are and keep a complete record of all betting activity in case of enquiries. Furthermore, customers can monitor the odds on the exchanges' user-friendly platforms independently. Exchanges and the authorities can be immediately alerted should suspicious betting patterns become apparent. Some exchanges have signed agreements with governing bodies of sport including the Jockey Club, with whom they insist they will co-operate with fully if the latter suspects corruption to have taken place. Exchanges have co-operated with police investigations when asked to do so, sometimes leading to arrests.
Acest articol conţine materiale traduse şi adaptate din Wikipedia de Nicolae Sfetcu sub licenţă gratuită GNU.
Bonus sports arbitrage
Many bookmakers offer first time users a signup bonus in the range $10 - $200 for depositing an initial amount. They typically demand that this amount is wagered a number of times before the bonus can be withdrawn. Bonus sport arbitraging is a form of sports arbitraging where you hedge or back your bets as usual, but since you received the bonus, a small loss can be allowed on each wager (2-5 %), which comes off your profit. In this way the bookmakers wagering demand can be met and the initial deposit and sign up bonus can be withdrawn with little loss.
The advantage over usual betting arbitrage is that it is a lot easier to find bets with an acceptable loss, instead of an actual profit. Since most bookmakers offer these bonuses this can potentially be exploited to harvest the sign up bonuses.
Making money:
By signing up to various bookmakers, it's possible to turn these 'free' bets into cash fairly quickly, and either making a small arbitrage, or in the majority of cases, making a small loss on each bet, or trade. However, it is relatively time consuming to find close matched bets or arbs, which is where an arb / close matched bet service is useful.
Drawbacks:
As well as spending time physically matching odds from various bet sites to exchanges, the other draw back with bonus bagging / arb trading in this sense is that often the free bets are 'non-stake returned'. This effectively reduces the odds, in decimal format, by 1. Therefore, in order to reduce 'losses' on the free bet, it is necessary to place a bet with high odds, so that the percentage difference of the decrease in odds is minimised.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia.
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