[DownTownTonyBrown]

"For an IF to be called, it's totally irrelevant as to where the Infielders are standing or positioning themselves. The "ordinary effort" is a judgemental definition which does not refer to the actual physical talents of a specific ballplayer."

Jerry, I would say you are wrong. Agreeably, a player can position himself anywhere. But I believe you have taken what someone has explained as the definition of the "infield" and are using it to define "ordinary effort." Thereby, you have removed the ordinary effort part of the in-field-fly rule. It appears, you would simply call IFF based solely upon the location of the hit ball and the attributes of a fly. This is wrong.

The ball must be capable of being caught by the players that are on the field from their current locations.

The "infield" is anywhere that an infielder can cover. It includes areas in the grass where potentially, an outfielder could also cover. (This by itself is a judgemental call. A properly declared in-field-fly can legally be caught by an outfielder.)

Ordinary effort means the player, or players, can get there and make a catch. (Hence the original comment made by Spots101 about shoulders square to the umpire - although I have never heard of this.) If the ball is not capable of being caught by the defense from their current positions, the fly ball is a HIT and the runners should be advancing. In this case YOU are SACRAFICING the batter-runner to protect runners that should be running.

Any declared in-field-fly that drops to the ground must have intentionally/obviously been left to fall, unhindered by a defense, THAT COULD HAVE CAUGHT THE BALL. Otherwise the offensive coach will be screaming that you called an out that wasn't going to be made - and likely cost him a run. You exchanged his run for your out.

Positioning of the defense cannot be disregarded; they must be capable of getting to the ball and making the catch with ordinary effort.