The winning squares are determined by using the last digit of each team's score at the end of each quarter.
Example:
The score at the end of the first quarter is AFC 10 NFC 14, you would find the number 4 in the top row and the number 0 in the left hand column. Follow those numbers to see which square they intersect, the person's name that is in that square would be the winner of the first quarter.
The final winning square will be the score at the end of the 4th quarter or at the end of the whole game in case of an overtime.