The two players select their lineups from imaginary players or actual players by converting their stats to the game's parameters. (This is easily done from mlb.com on the net.)
The Defensive team is the manager and catcher, selecting pitch types (Fast Ball, Off Speed, Pitch out, etc. )to get batters out.
Offensive managers and batters must then select a type of offense/ball in play strategy (Steal, Bunt, Hit and Run, Long Ball, etc.)The defensive team commits first with a "Pitch" card. The offensive team then orally calls its strategy. The results of the two choices are found by cross indexing them on a result matrix table. This is classic matrix game theory where one player is trying to minimize his opponent's results while maximizing his own.
Players can decide on the size of ballpark before the game.
There are rules for series play in order to give proper rest to pitchers. The game even has injury possibilities.
Great baseball action.