It is relatively simple. A player is listed as they enter the scenario. Your antiquated "baseball based" format, a player is locked into a label for a single action after which the label is changed. In the softball format, a runner needs to be labeled only once.
For convenience, all players of the team in the field are given a number in accordance to their fielding position. All
fielders are referred to as
F with their proper position number:
F1
pitcher
F2
catcher
F3
first baseman
F4
second baseman
F5
third baseman
F6
shortstop
F7
left fielder
F8
center fielder
F9
right fielder
F10
extra fielder
A runner is referred to as
R. If there is more than one runner on base:
R1
is the one farthest in advance
R2
the one next farthest in advance
R3
is the third runner to be on base
Each batter is referred to as B and if there are two runners on base and one out, the batter is B4.
The bases are referred to as:
1B
first base
2B
second base
3B
third base
The outfield is referred to as:
RF
right field
CF
center field
LF left field