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Understanding American Football

 
Here’s a guide to the game:

General
Equipment
Game
Penalties
Officials
Tactics
Fights
Periods and overtime
Sledge hockey
Pond hockey

General

Ice hockey, often referred to simply as hockey, is a team sport played on ice. It is a fast paced and physical sport. Ice hockey is most popular in areas that are sufficiently cold for natural reliable seasonal ice cover such as Canada, the northern United States, Scandinavia and Russia, though with the advent of indoor artificial ice rinks it has become a year-round pastime at the amateur level in major metropolitan areas
 
Equipment
Since ice hockey is a full contact sport and bodychecks are allowed, injuries may be a common occurrence. Protective equipment is highly recommended and is enforced in all competitive situations. This usually includes a helmet, shoulder pads, elbow pads, mouth guard, protective gloves, heavily padded shorts, athletic cup/jock strap, shin pads,and a neck protector. And for goalies helmet, neck guard, chest protector, athletic cup/jock strap, heavily padded shorts and leg pads.
 
Game
While the general characteristics of the game are the same wherever it is played, the exact rules depend on the particular code of play being used. The two most important codes are those of the International Ice Hockey Federation (IIHF) and of the North American National Hockey League (NHL).
Ice hockey is played on a hockey rink. During normal play, there are 6 players, including 1 goaltender, per side on the ice at any time, each of whom is on ice skates. The objective of the game is to score goals by shooting a hard vulcanized rubber disc, the puck, into the opponent's goal net, which is placed at the opposite end of the rink. The players may control the puck using a long stick with a blade that is commonly curved at one end.
Players may also redirect the puck with any part of their bodies, subject to certain restrictions. Players can angle their feet so the puck can redirect into the net, but there can be no kicking motion. Players may not intentionally bat the puck into the net with their hands.
Hockey is an "offside" game, meaning that forward passes are allowed, unlike in rugby.
The 5 players other than the goaltender are typically divided into 3 forwards and 2 defencemen. The forward positions consist of a centre and two wingers: a left wing and a right wing. Forwards often play together as units or lines, with the same 3 forwards always playing together. The defencemen usually stay together as a pair, but may change less frequently than the forwards. A substitution of an entire unit at once is called a line change. Teams typically employ alternate sets of forward lines and defensive pairings when shorthanded or on a power play. Substitutions are permitted at any time during the course of the game, although during a stoppage of play the home team is permitted the final change. When players are substituted during play, it is called changing on the fly. A new NHL rule added in the 2005-2006 season prevents a team from changing their line after they ice the puck.
The boards surrounding the ice help keep the puck in play and they can also be used as tools to play the puck. The referees, linesmen and the outsides of the goal are "in play" and do not cause a stoppage of the game when the puck or players are influenced (by either bouncing or colliding) into them. Play can be stopped if the goal is knocked out of position. Play often proceeds for minutes without interruption. When play is stopped, it is restarted with a faceoff. Two players "face" each other and an official drops the puck to the ice, where the two players attempt to gain control of the puck.
There are 3 major rules of play in ice hockey that limit the movement of the puck:
•    offsides
•    icing
•    out of play.
The puck goes "out of play" whenever it goes past the perimeter of the ice rink (onto the player benches, over the "glass", or onto the protective netting above the glass) and a stoppage of play should be called by the officials. It also does not matter if the puck comes back onto to the ice surface from those areas as the puck is considered dead once it leaves the perimeter of the rink.
Under IIHF rules, each team may carry a maximum of 20 players and 2 goaltenders on their roster. NHL rules restrict the total number of players per game to 18 (12 forwards and 6 defensemen) plus 2 goaltenders.
 
Penalties
Altercations often occur near the goal after a stoppage of play, since defensive players are extremely concerned with protecting their goaltender. All rulebooks call for penalties if an offensive player interferes with a goaltender's ability to defend the goal.
For most penalties, the offending player is sent to the penalty box and his team has to play without him and with one less skater for a short amount of time. Most minor penalties last for two minutes, unless a major penalty of five minutes duration, or a double minor penalty of two consecutive penalties of two minutes duration, has been assessed. The team that has taken the penalty is said to be playing shorthanded while the other team is on the powerplay.
A two-minute minor penalty is often called for lesser infractions such as tripping, elbowing, roughing, high-sticking, delay of the game, holding or too many players on the ice, illegal equipment, charging (leaping into an opponent or body-checking him after taking more than two strides), holding, interference, hooking, or cross-checking. As of the 2005-06 season, a minor is also assessed for diving, where a player embellishes a hook or trip. More egregious fouls of this type may be penalized by a four-minute double-minor penalty, particularly those which cause injury to the victimized player. These penalties end either when the time runs out or the other team scores on the power play. In the case of a goal scored during the first two minutes of a double-minor, the penalty clock is set down to two minutes upon a score effectively expiring the first minor penalty. Five-minute major penalties are called for especially violent instances of most minor infractions that result in intentional injury to an opponent, or when a "minor" penalty results in visible injury (such as bleeding), as well as for fighting. Major penalties are always served in full; they do not terminate on a goal scored by the other team. The foul of 'boarding', defined as "check[ing] an opponent in such a manner that causes the opponent to be thrown violently in the boards" by the NHL Rulebook is penalized either by a minor or major penalty at the discretion of the referee, based on the violence of the hit. A minor or major penalty for "Boarding" is also often assessed when a player checks an opponent from behind and into the boards.
Some varieties of penalties do not always require the offending team to play a man short. Concurrent five-minute major penalties in the NHL usually result from fighting. In the case of two players being assessed five-minute fighting majors, they both serve five minutes without their team incurring a loss of player (both teams still have a full complement of players on the ice). This differs with two players from opposing sides getting minor penalties, at the same time or at any intersecting moment, resulting from more common infractions. In that case, both teams will have only four skating players (not counting the goaltender) until one or both penalties expire (if one expires before the other, the opposing team gets a power play for the remainder); this applies regardless of current pending penalties, though in the NHL, a team always has at least three skaters on the ice. Ten-minute misconduct penalties are served in full by the penalized player, but his team may immediately substitute another player on the ice unless a minor or major penalty is assessed in conjunction with the misconduct (a two-and-ten or five-and-ten). In that case, the team designates another player to serve the minor or major; both players go to the penalty box, but only the designee may not be replaced, and he is released upon the expiration of the two or five minutes, at which point the ten-minute misconduct begins. In addition, game misconducts are assessed for deliberate intent to inflict severe injury on an opponent (at the officials' discretion), or for a major penalty for a stick infraction or repeated major penalties. The offending player is ejected from the game and must immediately leave the playing surface (he does not sit in the penalty box); meanwhile, if a minor or major is assessed in addition, a designated player must serve out that segment of the penalty in the box (similar to the above-mentioned "two-and-ten").
A player who is tripped, or illegally obstructed in some way, by an opponent on a breakaway – when there are no defenders except the goaltender between him and the opponent's goal – is awarded a penalty shot, an attempt to score without opposition from any defenders except the goaltender. A penalty shot is also awarded for a defender other than the goaltender covering the puck in the goal crease, a goaltender intentionally displacing his own goal posts during a breakaway in order to avoid a goal, a defender intentionally displacing his own goal posts when there is less than two minutes to play in regulation time or at any point during overtime, or a player or coach intentionally throwing a stick or other object at the puck or the puck carrier and the throwing action disrupts a shot or pass play.
An ice hockey referee is responsible for assessing most penalties during a game.
Officials also stop play for puck movement violations, such as using one's hands to pass the puck in the offensive end, but no players are penalized for these offences. The sole exceptions are deliberately falling on or gathering the puck to the body, carrying the puck in the hand, and shooting the puck out of play in one's defensive zone (all penalized two minutes for delay of game).
A new penalty in the NHL applies to the goalies. The goalies now are unable to play the puck in the "corners" of the rink near their own net. This will result in a two-minute penalty against the goalie's team. The area immediately behind the net is the only area behind the net in which the goalie can play the puck.
An additional rule that is not a penalty in the new NHL is the two line offside passes. There are no more two-line offside pass whistles blown. Now players are able to pass to teammates who are more than the blue and centre ice red line away.
The NHL has taken steps to speed the game of hockey up and create a game of finesse, by retreating from the past where illegal hits, fights, and "clutching and grabbing" among players was commonplace. Rules are now much more strictly enforced resulting in more infractions being penalized which in turn provides more protection to the players and allows for more goals to be scored.
There are many infractions for which a player may be assessed a penalty. The governing body for United States amateur hockey has implemented many new rules to reduce the number stick-on-body occurrences, as well as other detrimental and illegal facets of the game ("Zero Tolerance").
In men's hockey, but not in women's, a player may use his hip or shoulder to hit another player if the player has the puck or is the last to have touched it. This use of the hip and shoulder is called body checking. Not all physical contact is legal — in particular, hits from behind and most types of forceful stick-on-body contact are illegal.
 
Officials
A typical game of ice hockey has 2 to 4 officials on the ice, charged with enforcing the rules of the game. There are typically two linesmen who are responsible only for calling offside and icing violations, and one or two referees, who call goals and all other penalties. Linesmen can, however, report to the referee(s) that a penalty more severe than a two-minute minor penalty should be assessed against an offending player, or when a too many men on the ice infraction occurs. On-ice officials are assisted by off-ice officials who act as goal judges, time keepers, and official scorers.
The most widespread system in use today is the 3-man system, that features one referee and two linesmen. With the first being the National Hockey League, a number of leagues have started to implement the 4-official system, where an additional referee is added to aid in the calling of penalties normally difficult to assess by one single referee. The system has proven quite successful in the NHL and the IIHF have adopted it for the World Championships, slightly discussed during the 2008 World Championships in Quebec City and Halifax, Canada. Many other leagues are adopting the system for the next season, which only downside at the moment is the increased cost for the leagues.
Officials are selected by the league for which they work. Amateur hockey leagues use guidelines established by national organizing bodies as a basis for choosing their officiating staffs. In North America, the national organizing bodies Hockey Canada and USA Hockey approve officials according to their experience level as well as their ability to pass rules knowledge and skating ability tests. Hockey Canada has officiating levels I through VI. USA Hockey has officiating levels 1 through 4.
Officials can also be called a referee.
 
Tactics
An important defensive tactic is checking – attempting to take the puck from an opponent or to remove the opponent from play. Stick checking, sweep checking, and poke checking are legal uses of the stick to obtain possession of the puck. The neutral zone trap is designed to isolate the puck carrier in the neutral zone preventing him from entering the offensive zone. Body checking is using one's shoulder or hip to strike an opponent who has the puck or who is the last to have touched it (the last person to have touched the puck is still legally "in possession" of it, although a penalty is generally called if he is checked more than two seconds after his last touch). Often the term checking is used to refer to body checking, with its true definition generally only propagated among fans of the game.
Offensive tactics include improving a team's position on the ice by advancing the puck out of one's zone towards the opponent's zone, progressively by gaining lines, first your own blue line, then the red line and finally the opponent's blue line. NHL rules instated for the 2006 season redefined icing to make the two-line pass legal; a player may pass the puck from behind his own blue line, past both that blue line and the centre red line, to a player in front of the opponents' blue line. Offensive tactics are designed ultimately to score a goal by taking a shot. When a player purposely directs the puck towards the opponent's goal, he or she is said to shoot the puck.
A deflection is a shot which redirects a shot or a pass towards the goal from another player, by allowing the puck to strike the stick and carom towards the goal. A one-timer is a shot which is struck directly off a pass, without receiving the pass and shooting in two separate actions. A deke (short for decoy) is a feint with the body and/or stick to fool a defender or the goalie. Headmanning the puck, also known as cherry-picking or breaking out, is the tactic of rapidly passing to the player farthest down the ice.
A team that is losing by one or two goals in the last few minutes of play will often elect to pull the goalie; that is, remove the goaltender and replace him or her with an extra attacker on the ice in the hope of gaining enough advantage to score a goal. However, it is an act of desperation, as it sometimes leads to the opposing team extending their lead by scoring a goal in the empty net.
A delayed penalty call occurs when a penalty offense is committed by the team that does not have possession of the puck. In this circumstance the team with possession of the puck is allowed to complete the play; that is, play continues until a goal is scored, a player on the opposing team gains control of the puck, or the team in possession commits an infraction or penalty of their own. Because the team on which the penalty was called cannot control the puck without stopping play, it is impossible for them to score a goal, however, it is possible for the controlling team to mishandle the puck into their own net. In these cases the team in possession of the puck can pull the goalie for an extra attacker without fear of being scored on. If a delayed penalty is signaled and the team in possession scores, the penalty is still assessed to the offending player, but not served.
 
Fights
Although fighting is officially prohibited in the rules, at the professional level in North America fights are unofficially condoned. Enforcers and other players fight to demoralize the opposing players while exciting their own, as well as settling personal scores. The amateur game strictly prohibits fisticuffs, as a player who receives a fighting major is also assessed at least a 10 minute misconduct penalty (NCAA and some Junior league) or a game misconduct penalty (high school and younger).
 
Periods and overtime
A professional game consists of 3 periods of 20 minutes each, the clock running only when the puck is in play. The teams change ends for the second period, again for the third period, and again at the start of each overtime played. Recreational leagues and children's leagues often play shorter games, generally with three shorter periods of play.
Various procedures are used if a game is tied. In tournament play, as well as in the NHL playoffs, North Americans favour sudden death overtime, in which the teams continue to play twenty minute periods until a goal is scored. From 1999-2000 until 2003-04 the National Hockey League decided ties by playing a single five minute sudden death overtime period with each team having four players (plus a goalie) per side to "open-up" the game. In the event of a tie, each team would still receive one point in the standings but in the event of a victory the winning team would be awarded two points in the standings and the losing team one point. The only exception to this rule is if a team opts to pull their goalie in exchange for an extra skater during overtime and is subsequently scored upon (an 'Empty Net' goal), in which case the losing team receives no points for the overtime loss. International play and several North American professional leagues, including the NHL (in the regular season), now use an overtime period followed by a penalty shootout. If the score remains tied after an extra overtime period, the subsequent shootout consists of three players from each team taking penalty shots. After these six total shots, the team with the most goals is awarded the victory. If the score is still tied, the shootout then proceeds to a sudden death format. Regardless of the number of goals scored during the shootout by either team, the final score recorded will award the winning team one more goal than the score at the end of regulation time. In the NHL if a game is decided by a shootout the winning team is awarded two points in the standings and the losing team is awarded one point. Ties no longer occur in the NHL.
 
Sledge hockey
Sledge hockey is a form of ice hockey designed for players with physical disabilities affecting their lower bodies. Players sit on double-bladed sledges and use two sticks; each stick has a blade at one end and small picks at the other. Players use the sticks to pass, stickhandle and shoot the puck, and to propel their sledges. The rules are very similar to IIHF ice hockey rules.
Canada is a recognized international leader in the development of the sport, and of equipment for players. Much of the equipment for the sport was first developed in Canada, such as sledge hockey sticks laminated with fibreglass, as well as aluminium shafts with hand carved insert blades and special aluminium sledges with regulation skate blades.
 
Pond hockey
Pond hockey is a form of ice hockey played generally as pick-up hockey on lakes and ponds. Pond hockey rules differ from traditional hockey, placing a greater emphasis on skating abilities. Since 2002, the World Pond Hockey Championship has been played in Plaster Rock, New Brunswick, Canada.
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