 Instead of requiring that a team advance the ball ten yards, sometimes two pass completions result in a first down.Another option is to eliminate first downs entirely, so that a team gets four (sometimes five) chances to score.When it is desired for an odd number of players to play, it is common to allow one player to be an "all-time Quarterback" player; this player will always be on the offense or the kicking team, switching sides throughout the game.