Thanks Puntz, but what I am looking at is routine dutching (of 4 runners in this case) where one of them also has a lay bet. The effect that the lay bet will have on the profit of each runner should it win. Also, how much money is being held over by the exchange to cover these bets.

The profit I show against each runner is what your account should increase by after all monies has been settled. This is assuming one of the 4 runners win of course.