A hockey game is a contest between two teams trying to shoot a rubber puck into the opposing team’s net. The team with the most goals after three 20-minute periods wins. If the score is tied at the end of regulation, the game goes to overtime. Beyond that simple framework, hockey has a layered set of rules governing everything from player substitutions to how the puck can legally travel down the ice.
The Rink and Its Zones
An NHL rink is 200 feet long and 85 feet wide, surrounded by boards and glass. Two blue lines divide the ice into three zones: a neutral zone in the middle and two end zones, one for each team. A red center line splits the rink in half. At each end, a goal sits 11 feet from the back boards, surrounded by a painted semicircle called the crease. That crease is the goaltender’s territory, and specific rules protect them inside it.
The zones matter because of how they affect play. When your team has the puck, the end zone near the opponent’s goal is your attacking zone. The end zone near your own goal is your defensive zone. Players cannot enter the attacking zone ahead of the puck, or the play is whistled dead for offside. This single rule shapes how teams move up the ice together.
Players and Positions
Each team puts six players on the ice at a time: one goaltender, two defensemen, and three forwards. The forwards are a center and two wingers (left and right). The center covers the full length of the ice, takes most faceoffs, and coordinates the attack. The wingers play on either side, primarily focused on generating scoring chances. The two defensemen stay closer to their own net, breaking up opposing rushes and clearing the puck out of danger.
The goaltender’s job is straightforward but punishing: stop the puck from crossing the goal line. Goalies wear specialized equipment and rarely leave the area around their net. Unlike every other player, goalies cannot be substituted on the fly during normal play, though teams will sometimes pull the goaltender late in a game to add an extra skater when they’re trailing.
Hockey rosters are much larger than the six players you see on the ice. NHL teams dress 18 skaters and two goaltenders for a game. Players rotate on and off the ice in shifts that typically last 45 seconds to a minute, swapping out “on the fly” without stopping play. Fresh legs are critical because the pace is relentless.
Periods, Intermissions, and Game Length
A regulation game has three periods of 20 minutes each, totaling 60 minutes of playing time. The clock stops every time the whistle blows, so those 60 minutes stretch considerably in real time. Between the first and second periods, and again between the second and third, there’s an 18-minute intermission in the NHL. (Other leagues often have shorter breaks.) From puck drop to final buzzer, most games take about two and a half hours.
If the score is tied after three periods in the NHL regular season, teams play a five-minute overtime period with only three skaters per side instead of five, creating more open ice and faster scoring chances. If nobody scores, the game goes to a shootout, where players take turns trying to score one-on-one against the opposing goalie. In the playoffs, there are no shootouts. Teams play full 20-minute overtime periods, five-on-five, until someone scores.
How Goals Are Scored
A goal counts when the entire puck crosses the goal line between the posts and under the crossbar. Players can score by shooting, deflecting, or even kicking the puck toward the net, though a puck deliberately kicked in with a distinct kicking motion doesn’t count. You also can’t bat the puck in with your hand or score with a stick raised above the crossbar.
After every goal, play restarts with a faceoff at center ice. The players on the scored-upon team often change lines, and coaches may adjust matchups depending on the situation.
Faceoffs
Faceoffs restart play after every stoppage, whether it’s a goal, a penalty, an offside call, or the puck leaving the playing surface. An official drops the puck between two opposing players, who try to win possession for their team. Where the faceoff happens depends on why play stopped. Goals restart at center ice. Icing calls and penalties in the defensive zone restart near the offending team’s goal. This positioning matters because winning a faceoff deep in the opponent’s zone creates an immediate scoring chance.
Offside and Icing
Two rules control how the puck moves up and down the ice. Offside prevents cherry-picking: no attacking player can cross the blue line into the offensive zone before the puck does. If a player is already in the zone when a teammate carries or passes the puck in, play stops and a faceoff moves back to the neutral zone.
Icing prevents teams from just dumping the puck the full length of the ice to relieve pressure. Icing is called when a player shoots the puck from their own side of the center red line all the way past the opposing team’s goal line without anyone touching it. The NHL uses “hybrid icing,” where the official judges which team would reach the puck first rather than waiting for someone to actually touch it. If the defending team would get there first, icing is called and the faceoff comes all the way back to the offending team’s end. If the team that shot the puck would reach it first, play continues.
There’s one important exception: icing is not called against a team that’s shorthanded due to a penalty. This lets penalized teams clear the puck out of their zone without being forced to keep defending in tight quarters.
Penalties and Power Plays
When a player commits an infraction, they sit in the penalty box for a set amount of time, and their team plays shorthanded. A minor penalty, the most common type, lasts two minutes. Common minor penalties include tripping, hooking (using the stick to impede another player), slashing, holding, and interference. If the team with the extra player scores during those two minutes, the penalty ends early and the penalized player returns.
More serious infractions earn a major penalty of five minutes, and unlike minors, the full five minutes must be served even if the opposing team scores. Fighting, for instance, results in a five-minute major for both players involved.
The team with the extra skater is “on the power play,” and these are some of the highest-scoring situations in hockey. Teams practice specific formations and passing sequences designed to exploit the extra space. A typical NHL power play converts at a rate of roughly 20 to 25 percent, making penalties one of the most consequential moments in any game. If a team commits two penalties in quick succession, the opponent can have a five-on-three advantage, which is extremely difficult to defend.
The Officials
NHL games use four on-ice officials: two referees and two linesmen. Their jobs are distinct. Referees call penalties, award goals, and have final authority over disputes. Linesmen handle offside and icing calls, conduct most faceoffs, and break up fights. Linesmen can also flag penalties they see behind the play that the referees may have missed, though only the referees can officially assess the penalty.
Off the ice, video review plays a growing role. Goals can be reviewed for offside, goaltender interference, and whether the puck fully crossed the line. Coaches can also challenge certain calls, though an unsuccessful challenge costs their team a minor penalty.
The Puck
The puck is a vulcanized rubber disc, 3 inches in diameter and weighing between 5.5 and 6 ounces. Pucks are frozen before games to reduce bouncing and keep them sliding smoothly on the ice. Despite their small size, pucks are hit hard enough to reach speeds well over 100 miles per hour on the hardest shots, which is why boards, glass, and netting surround the rink to protect spectators.
What Decides the Winner
The team with the most goals at the end of regulation wins. In the NHL regular season, a regulation win earns two points in the standings, and a loss earns zero. However, if the game goes to overtime, the losing team still gets one point, which is why you’ll sometimes hear commentators say a game is worth “a guaranteed point” once it reaches overtime. This system rewards competitive games and keeps standings tight throughout the season.
In the playoffs, standings points don’t matter. Each round is a best-of-seven series, and every game must produce a definitive winner. Overtime periods continue, 20 minutes at a time, until someone scores. Playoff overtime games have occasionally stretched past midnight, with exhausted players logging double or triple their normal ice time.