Arbitrage using only the back or lay side might occur on betting exchanges.

Modern horse racing systems can rely on specific betting possibilities only offered on betting exchanges.

Anyone providing facilities that allow people to bet against each other, except betting exchanges.

Recent allegations of race fixing have centered around the recently formed betting exchanges which unlike traditional bookmakers allow punters to lay an outcome (that is, to bet against a particular runner).

In 2006, according to Casino City Press, BetOnline.com was among the top 60 online sportsbook, racebook, and betting exchanges, by overall traffic received.

Remember that you can bet to win or to lose on betting exchanges on the Grand Prix.

The allegations focus on horses being laid to lose on betting exchanges.

The growth of betting exchanges such as Betfair has also led to the emergence of "trading rooms" designed for professional gamblers.

Traders can make money by betting exclusively with betting exchanges or bookmakers, or by combining the two.

Decimal odds are also favoured by betting exchanges because they are the easiest to work with for trading.