Abstract: This invention relates to computer systems, and methods for facilitating wagering. In particular, the invention related to a computer system to facilitate in the placing of bets requiring multiple selections in a bet unit by enabling the gambler to complete a single bet slip, for the placing of wagers having multiple betting combinations by using groups and rules in the selection process, to control the number of times any of these betting combinations or bet units are taken and whether any betting combinations or bet units are placed as a fixed odds bet or as a pooled bet. The computer system further enables a gambler to develop or select a module of commands capable of producing wagers automatically and further provides a system to reward the gambler for the relative correctness of his wager.