Types of Infield Fly Plays

1. Routine play: An infielder camped directly under an infield fly (a.k.a. ordinary effort) waiting to make a catch.

Called infield flies that are Routine catches are seldom questioned.

2. Not so Routine or Difficult: Infield player(s) under an infield fly that is being affected by the wind or the defense is having to move back onto the outfield grass. 

                             

Called infield flies that are Not so Routine or Difficult plays will be frequently questioned. If the ball is dropped and an (infield fly has not been called) a double or triple play can follow and you will hear great displeasure from someone.

                        Baseball Rules in Black and White 

3. Train Wreck plays: Infielder(s) or outfielder(s) converging in the infield or in the outfield fringe.

If the ball is dropped and an (infield fly has not been called) when there are Train Wrecks double and triple plays can follow and you will hear great displeasure from someone.