Esports Arbitrage

Esports arbitrage is the practice of backing every possible outcome of an esports match across different bookmakers at odds that guarantee a profit no matter which result occurs. It exploits price discrepancies between operators who disagree on the true probabilities of a fixture, most often in fast-moving markets like CS2, Dota 2, League of Legends or Valorant where lines can move quickly and inefficiently. An arbitrage, or "arb", exists when the combined implied probability of all outcomes falls below 100%. You calculate this by summing the inverse of each price. If the total is under 1.0 (100%), a guaranteed profit is mathematically locked in once stakes are correctly proportioned across the two books. Worked example: Bookmaker A prices Team Liquid to beat NAVI at 2.10 (decimal), while Bookmaker B prices NAVI at 2.10. The implied probabilities are 1/2.10 + 1/2.10 = 47.6% + 47.6% = 95.2%, leaving a 4.8% edge. Staking £100 on each side commits £200 total; whichever team wins returns £210, a guaranteed £10 profit (5%) regardless of the result. For affiliates, arbitrage is worth understanding because bookmakers actively discourage it: accounts that consistently arb are frequently limited or closed, and many terms explicitly prohibit it. Esports markets add extra risk through map-vs-match confusion, void rules on forfeits, and rapid line movement that can collapse an arb before both bets are placed. Compare with arbitrage betting, middling, sure betting via dutching, and line shopping.