Patent ID: 7690991

Claim:
A betting exchange system for permitting a plurality of users to bet against one another, the system comprising: a server configured to receive bet offers and bet requests from the plurality of users over a communications network, each of said offers specifying a price at which the user originating the offer is prepared to lay a given outcome, together with a bet size offered at said price, the server being arranged to aggregate said offers to provide a first set of information for display to said plurality of users, said first set of information including the best price at which each of the possible outcomes is available to be backed at a given time and the aggregated size available at said best price, and each of said requests specifying a price at which the user originating the request is prepared to back a given outcome, together with a bet sire requested at said price, said server being operable to match said bet offers with said bet requests based on said specified prices and sires, and in the event that the server cannot match said requests at the prices and sizes specified, the server being further arranged to aggregate said bet requests to provide a second set of information for display to said plurality of users, said second set of information including the best price at which each of the possible outcomes is available to be laid at a given time and the aggregated size available #at said best price, and the server being operable to update the first and second sets of information for display to said users in response to received bet offers and bet requests, such that said users can in real-time see the best price at which they can back or lay any outcome and the total size available at that price, to thereby permit the plurality of users to bet against one another.