Try, I'm Dutching all the selections according to Betfair's prices as shown on their Exchange just prior to the jump.

My target return is $100, and if the outlay is $80 or more then it's a no-bet race. This has only ever happened once with all the many races because one or two fancied horses are often not selected, and as the minimum number of runners per race is 11 this is a strong possibility.

I'm surprised how many selections blow in the betting and often if they win, the return is pleasantly high.