[JRutledge]

There is not magic formula. Some fields are made differently and you cannot judge by the how many feet on the grass or not on the grass. Hell, some fields have no dirt to make that determination at all. That will come with experience and using good judgment. But to me "ordinary effort" is when the fielder is clearly underneath the ball. Where that takes place is not really an issue. And depending on the level you are doing might play even a different standard. Ordinary effort for a Little Leaguer is much differnent than a College player.

Peace