Setting Up an Office Pool
Who's in Charge?
The person overseeing your pool is often called the Administrator. Their main job is to distribute the grid and determine the winners. When you sign up, just place your name in the squares that look good to you. Unless otherwise stated, there's no limit on how many squares you can choose.
Drawing Numbers
Filling out the grid first is key. Don't draw numbers until everything's complete because some scores/numbers are more likely to happen than others. This is an advantage for folks who sign up early.
The easiest way to draw is as follows: place the numbers 0-9 in a hat and pull them out one at a time. Start with the top row and work your way down, then do the same for each column.
Winning Squares
This depends on the type of grid you're using. Generally, winning squares are determined by looking at the last digit of each team's score at a specific point in time.
If it's we have Team A at 13 points and Team B at 17 points at the end of the game use the last digit of their scores (3 for Team A, 7 for Team B). Wherever those numbers line up is where you find your winning square. Do this for each interval to see who wins.
What About Overtime?
If it goes into overtime or extra innings, just use the final score of that game to figure out the winner of the last interval.