Jack, I can't answer your question, but I hope someone can as I have one plan that requires 3 bets per race, using the fav as the stake saver, it's kinda a guess but I tend to bet 2 units on the fav /(shortest price), 2 units on the 2nd fav/(next longest price) and 1 unit on the longest price. eg. 2-1. 4-1, 10-1 so 2,2,&1, shows about evens if the 4-1 or the 10-1 wins and still a slight profit if the fav wins.