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Betting arbitrage or sure bets is a case of a betting system arising on betting markets due to either bookmakers' different opinions on event outcomes or plain errors. The bettor can make a profit simply by placing one bet per each outcome with different betting companies.
Betting arbitrage (simply called an arb) is typically around 2%, sometimes less, sometimes slightly more. In special cases you can find arbs of 5% and even 20% - but these arbs happen only by an error and are very risky to bet.
If you would like to get some income from betting arbitrage you should bet with relatively large sums of money. The profit is only 2% of average of the betting amount so this should be rather huge amount.
Imagine the situation that you have just find two bookies which gives the following odds for a particular event: the first bookie offers 1.5 on the first competitor while the other offers 3.2 on the second competitor. It is easy to calculate that if you will bet 67 cash units on the first competitor at the first bookie and 32 on the second competitor at the second bookie - you will win over 100 cash units regardless of the outcome of the sport event. Because you had to bet 67 + 32 = 99 cash units only - it is a real sure bet.
You can learn more about sure bets.
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