A method to operate simultaneous races providing racecourses (10) printed on bet slips and scheduling draws of random numbers for racer advancements. On a bet slip, the player marks one selectable spot for a racer to start and none to scratch a racer, and also selects which forthcoming draws will be applicable to advance racers. Make-up bets can be placed between advancements. Besides, a 1-race bet winner can earn cash payoff or non-cashable credit to wager like cash. The ticket holder of a hanging multi-race bet has the option to trade in hanging credit for placing other bets. How to calculate advancement probabilities, winner credits, hanging credits and specific house edge formulas for payoffs will be provided. An automatic computer/video version of the game is included.