The history of rugby originated from football and rugby. The first rugby match between McGill University and Harvard University adopted rugby rules. . The National Football League was founded in 1920, when a formal alliance document was signed in the Hope Mobile Sports Car Exhibition Hall in Ohio. . 1960, the American Football League (afl) was established to compete with the National Football League for the market. . 1966, afl and nfl signed an agreement, and 1970 formally merged into the nfl. The championship finals of both sides began in 1967. . 1967, the first afl-nfl championship was held in Los Angeles. In 1969, the game was named Super Bowl. The basic point is to pay attention to the use of regional defense and offensive tactics in football matches. . At the end of the game, the team that scored more points won. . Each team has 1 1 players. Each team has 1 1 offensive players and 1 1 defensive players, and takes turns to play. In terms of game time, an nfl game is divided into four quarters, each of which is 15 minutes. The first two quarters are the first half and the last two quarters are the second half. If the two teams draw within the specified time, there will be an overtime game, and the final winner will be decided by sudden death. . There will be a 12 minute intermission between the first half and the second half. . Each team had three timeouts in the first half and the second half. "Three teams in a football team" and "Offensive Group"-advance the position by passing the ball in the air and rushing the ball on the ground, and try to score a touchdown (6 points). After a touchdown, you can kick a free kick < 1 point > or score a touchdown < 2 points > > defense group-try to stop the opponent from scoring and regain the offensive right by tackling the opponent's ball-holding player, playing a deflected pass, intercepting the pass or the opponent concedes a goal. . Special team)-a group of players who are responsible for kicking and scoring points when the two sides exchange offensive and defensive rights, such as kicking flat balls, shooting, scoring points, kicking off, etc. The attacker is responsible for pushing the ball to the opponent's position until he scores or loses the right to attack. They scored a touchdown (6 points) by passing the ball in the air or pushing or running the ball on the ground into the opponent's end zone. The attacker must advance at least 10 yards in the four attack opportunities (bottom) to reach the first attack (bottom) and get a new four attack opportunities. Otherwise, the two sides exchange the ball rights. The offensive position is quarterback)-the leader of the team, who dominates the offensive tactics of most games. . Center)-line up in the middle of the kick-off line, responsible for kicking off every attack. . Guards)-Each attack group has two guards, lined up on both sides of the center. . Tackle)-each attack group has two tackles, which are lined up outside the defender. . Tightening-The line approaches the outside of the intercept (approaching or approaching). . The receiver)-line up at a distance of 10- 15 yards; Responsible for receiving the quarterback's air pass. . Running back)-usually standing behind the quarterback; Responsible for running with the ball, or preventing the opposing player from hitting the quarterback and receiving the quarterback's pass in the passing attack tactics. Defender The defender is responsible for preventing the attacker from scoring, and regaining the offensive right by catching the player with the ball so that he can't fall to the ground for the first time or cause the attacker to lose the ball. Defensive tackle in defensive position-line up on the defensive line; Responsible for resisting the collision of attackers; There are usually one or two defensive interceptors, depending on the defensive formation. . Defensive end)-line up on the defensive line; Responsible for dribbling to stop outside attackers or attacking quarterbacks; If the quarterback is successfully tackled after the kick-off line, it is called Sack. There are usually two front ends (see explanation). . Guard)-line up 2-3 yards behind the defensive interception and defensive end; Responsible for intercepting the other running guard and keeping an eye on the receiver; Sometimes this is called a surprise attack on the quarterback. . Corner back)- line up opposite the catcher; Be responsible for keeping an eye on the foreign takeover and assisting in intercepting running guards or offensive players with the ball; There are usually two corner guards, depending on the defensive and offensive formations. . Safety)-line up at 8- 10 yards of the melee line; Responsible for coordinating and defending the opponent's pass (preventing the attacker from advancing greatly); There are usually two central defenders, called strong security and free security. Members of the secret service team are responsible for kicking or catching the ball kicked by the other side, which is often called kicking or catching the ball. . Kick-off)-Kick-off in the first half, and kick-off after the team scores. . Score)-score 3 points by shooting the ball into the goal. . Punt)-When the two sides exchange the ball rights, the attacker tries to kick the ball to the end of the defender's field to increase the opponent's offensive distance. . Kick back)-the receiving team tries to catch the opponent's kick-off, and then returns as many yards as possible to the opponent's end zone. At the next meeting, the attacker must push the ball forward at least 10 yards within four attack opportunities, otherwise he will lose the right to attack and be attacked by the other side. . If the ball is successfully pushed at least 10 yards, the attacker can regain four offensive opportunities, which is called reaching the first down. . First down)-first try, second down)-second attack, third down)-third attack, fourth down)-last attack; At this time, there are several options (1) to try to win-try to get the number of yards or touchdown scores needed to reach the goal of ten yards. If it fails, the other party will fight back from the beginning. (2) Kick a goal)-Try to shoot the ball into the goal and get 3 points. (3) Kicking-the attacker chooses to kick the ball to the other side, and the other side begins to attack. Try to kick the ball within the opponent's 0-20 yard line when giving up playing football. Scoring rule touchdown = 6 points. The quarterback successfully passed the ball to the receiver, and the receiver took the ball to the other end and scored a touchdown. . The quarterback can pass the ball to the running guard, and then the running guard rushes into the opponent's touchdown zone with the ball to score. Plus points = 1 or 2 points. After a touchdown, you can win extra points in one of the following ways. A. Free kick, kicking the ball into the goal from near the 10 code line (available 1 minute). B. Attack again at a distance of 2 yards from the touchdown zone. You can run with the ball, or you can pass the ball to a player and he will play it. . In either case, the attacker can only get an extra score after a touchdown. Free kick (shooting score) = 3 points Free kick "is usually tried in the fourth attack (the last attack opportunity in a series of attacks or trying to score extra points after touchdown). . If you think the kick point is close to the opponent's end zone, you can kick the ball into the goal with confidence, and the secret service team will try a free kick. . When trying a free kick, the kicker must make the ball cross the crossbar and pass between two straight rafters. Safety = 2 points "Safety" is the least common scoring method among all scoring opportunities. If the attacking player is tackled by the defending player in his own end zone, the defending player will score 2 points. The attacker will also pass the ball and kick it to the defender, and the defender will start to attack. . Don't confuse the word "safety" with "central defender" in defensive position. The regular season of Super Bowl Tour usually begins in early September and lasts until the end of1February. . During the 17 week schedule, each team will play 16 games, once a week (one week has a bye).

(1) Each team will play two games with opponents in the same division, one at home and one away (* * * six games).

(2) Each team will compete with four teams in another division of the Federation (four games).

(3) Each team will also compete with four teams in another Federation division (four games).

(4) Each team will also play a game (two games) with two teams ranked the same last season in the remaining two divisions of the Federation.

Play-offs (playoffs)

The nfl playoffs begin at the end of1February. According to the winning and losing records of the season, 12 teams (6 nfc teams and 6 AFC teams) were selected to participate in the finals.

. All the finalists will take part in the knockout rounds of their respective federations and decide two federation champions.

. The two league champions will fight it out in the Super Bowl again.

Super bowl

The team that won the Super Bowl was the champion of the National Football League.

. The finals are usually held on the last Sunday in January or the first weekend in February.

. The winning team will win the Vince Randy Cup, named after the famous coach Randy, who led the Green Bay Packers to win the first and second Super Bowls.

. Every player on the winning team will get a Super Bowl championship ring.

. Today, Super Bowl fans have spread all over more than 175 countries.

. The Super Bowl has also become the focus of America's 130 million TV viewers.

. On Super Bowl Sunday, food sales in the United States exceed any day except Christmas and Thanksgiving.