The ultimate BET HEDGER! Sure Win Bet Calculator calculates a bet spread from your desired winnings in order to bet against the chance of a draw between two team events. Pick a sports match that you think is highly unlikely to be a draw, enter your desired winnings and this app will tell you how to bet! Sure Win Bet Calculator was originally developed in 2003 by Phil Ashton and Simon Wilson (University of Manchester) in order to place bets against the chance of draws.