Baseball positioning
In baseball, while there are nine named fielding positions, players
may move around freely. The positioning for the nine positions
is very flexible, although they all have regular depths—distances
from home plate, and sometimes lateral positioning. A shift means
that a player is playing in a noticeably different location than
the norm for his actual position.
A fielder who is playing shallow or in is playing closer to home
plate, while a player playing deep is playing farther from home
plate than normal.
Regular terms are used for some positionings, for example, double
play depth is used when there is a force play at second base.
This means the shortstop and second baseman are playing slightly
closer to second base and sometimes a little bit shallower. This
position makes it easier to turn the double play. Bringing the
corners in means the first and third baseman are both playing
in, this will often be used with runners at third base.
Baseball is unique among American sports in several ways. This uniqueness is a large part of its longstanding appeal and strong association with the American psyche.

