Well, essentially you're locking 2 players into line-up spots and leaving only 7 players to place into different orders. In that case, that should make for 49 different line-up possibilities.
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there are nine players on the field at a time. catcher pitcher shortstop secondbaseman firstbaseman thirdbaseman left fielder right fielder left fielder and center fielder
As far as the rules are concerned, there are no differences between the two leagues. The differences are in strategy and how to use players and mostly involve the pitcher. One tactic used in the National League is called the 'double switch'. This usually occurs late in a close ball game when the pitcher is due up to bat in the following inning. When a manager comes out to remove a pitcher sometimes he will also remove a fielder. Usually, this fielder has batted in the previous inning, maybe even made the final out of the inning. Since the manager has replaced two players, he may designate where the players will bat in the batting order. So the manager will place the new fielder in the batting position of the pitcher and the pitcher in the batting order of the replaced player. That allows the new fielder to bat in the next inning and places the pitcher to bat much later in the order.
1 - Pitcher 2 - Catcher 3 - First Baseman 4 - Second Baseman 5 - Third Baseman 6 - Shortstop 7 - Left Fielder 8 - Center Fielder 9 - Right Fielder
For Major League Baseball, there is a 40-man roster, in which 25 are on the "active roster" and the rest either on a temporary disabled list or in a minor league position. In a baseball game, only 9 members of the fielding team are in fielding positions, but can be replaced by another player, or can be rotated to a new position during the game. The 9 positions are : Pitcher Catcher First Baseman Second Baseman Shortstop (plays between 2nd and 3rd) Third Baseman Left Fielder Center Fielder Right Fielder So the total possible number of players on the field is between 10 and 13, including the batter for the opposing team and as many as 3 batting players occupying the bases.
E.R.A. stands for Earned Run Average. It is the average earned runs scored upon a pitcher per nine innings of work. It is called Earned because if a fielder makes an error allowing a runner to advance a base and that runner eventually scores, that run will not be charged to the pitcher's E.R.A.