Line up card/ Batter interference

[joemoore]

Originally posted by PeteBooth
A player is designated in the scorebook by name, shirt number and fielding position. A diagram shows the arrangement of fielders.

You left out the word "customary", because the manager can position his players any way he likes. Lineups become official after the umpire approves them. There is no penalty or limitation for changing positions, except for the pitcher.

So, a manager may well list all players as position 9 as described, and by extension, after listing the pitcher, listing the other positions is nothing more than courtesy. If you are correct in that listing players in proper position will affect strategy, then why would a manager ever list the non-pitchers in the correct position?