TWO-MINUTE CLOCK: In the last two minutes of each half use the time system described in the attached document. The key improvement over game rules is that the exact length of a play is somewhat variable, using the roll of one die for a range of one to six seconds in addition to standard amounts associated with the type of play and play yardage. Board game users need only create a set of time cards numbered 0 to 15 (writing the numbers on index cards works great). The result is a very realistic and exciting period in which both offense and defense attempt to play each second to full advantage as in real games.