From the developer: "OddsCalc is a hedge and dutch betting program, which will help you back multiple horses in any race for profit. Professional gamblers will uses this method of betting to place 'cover bets'. If you are following several systems, you may find that some races have 2 or more selections. What do you do? You could bet 1 point on both of the selections and hope that one of them wins or you could use OddCalc. OddsCalc will help you divided your bet between these horses, so that as long as one of the selections comes in you will make a profit."