It’s a bet on an event which ensures secure profit. The player may have a sure profit, by appropriately combining the odds of the market, regardless of the final outcome of the event which he bet. Example: On a football match between Arsenal and Liverpool, a player can find Arsenal to win at 2.10 odds on bookmaker A and Liverpool to win at 2.25 odds on bookmaker B. If the player bets an amount of money at both wins, will have a guaranteed profit, regardless if Arsenal or Liverpool win. For more information read our article about Arbitrage strategy.