Sportsbook risk management is the part of sportsbook software that limits how much a bookmaker could lose on any one result. It caps the stake that each customer may place, and it moves the odds when too much money is bet on one side. It also watches for bettors who seem to know more than the bookmaker does.
A bookmaker does not try to guess the winner. It wants the money on each side to be roughly balanced, so that it earns its margin whatever the result. If one result happens, the amount the bookmaker must pay out, minus the money it took in, is its loss on that result. This possible loss is called its liability.
Take, for example, an American football match, with bets taken by a bookmaker in the American state of New Jersey. Both teams are offered at odds of 1.90. Bettors have staked $400,000 on Team A and $150,000 on Team B, a total of $550,000. If Team B wins, the bookmaker pays out $285,000 and keeps $265,000. But if Team A wins, it must pay out $760,000. That is $210,000 more than it took in. Its limit for a single result is a loss of $100,000.
The risk system notices this as the bets arrive. It shortens the odds on Team A to 1.75, so that new bets on Team A pay less. It lengthens the odds on Team B to 2.10, so that new bets on Team B pay more. Both changes encourage new money onto Team B. It also lowers the largest stake that one customer may place on Team A. If the money still does not balance, the bookmaker can lay off part of its risk. This means it places a bet of its own with another bookmaker.
The system also builds a profile of each bettor. Some customers win steadily, because they are skilled or because they have inside information. The system lowers their limits. A sudden rush of bets on an unlikely result in a minor match can be a sign of match-fixing, the illegal arranging of a result in advance. The system passes such patterns to AML transaction monitoring, and to the bodies that protect the honesty of each sport.
Limits on customers have a second use. The same system enforces the deposit limits and breaks from betting that customers ask for, under responsible gambling.
The odds that this system adjusts are set by in-play odds, and both are parts of sportsbook software. Much of this software is built in Bengaluru, for bookmakers in Britain, Europe and America. Sports betting is not allowed online in India.