well don biyax.
bit too many runners for me, OK if i'm at the computer most of the day.
but very seldom that happens nowadays.
Also don't quite understand 'odds advantage' care to explain.
If you believe a horse should be5/2 and the odds are 7/4, that's an underlay, and no play. In the same race, if your 2nd choice is 3/1, and the odds are 5/1, that's an overlay, and an excellent play