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The 1972 NFL season was the 53rd regular season of the National Football League. The Miami Dolphins became the first (and to date the only) NFL team to finish a championship season undefeated and untied when they beat the Washington Redskins in Super Bowl VII. Kansas City moved their home games to Arrowhead Stadium at the Truman Sports Complex and became the 12th team to play its home games on artificial turf. ==Major rule changes== *The inbounds lines or hashmarks were moved closer to the center of the field, 23 yards, 1 foot, 9 inches from the sidelines. The hashmarks are now 18 feet, 6 inches apart (the same width as the goalposts), cutting down on severe angles for short field goal attempts. *If a legal receiver goes out of bounds, either accidentally or forced out, and returns to touch or catch the pass in bounds, the penalty is a loss of down (but no penalty yardage will be assessed). *If a punt or missed field goal crosses the receivers' goal line, a member of the receiving team may advance the ball into the field of play. Previously, the ball was dead when a scrimmage kick crossed the goal line and the receivers were awarded an automatic touchback. *All fouls committed by the offensive team behind the line of scrimmage will be assessed from the previous spot. *Tie games, previously ignored in computing of winning percentage, were made equal to a half-game win and a half-game loss. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「1972 NFL season」の詳細全文を読む スポンサード リンク
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