What are power play and penalty kill in hockey?

A power play is the game state where one team skates with more players than the other because the opposing side is serving a time penalty. The most common version is 5-on-4, but two stacked minors create a 5-on-3, and penalties taken during 4-on-4 play can leave a team on a 4-on-3. The team with extra skaters is "on the power play"; the short-handed team is "on the penalty kill".

Special teams — the umbrella term for power-play and penalty-kill units — often decide tight games. A minor penalty lasts 2 minutes, a major lasts 5 minutes, and the number of players in the box at any moment sets the man-advantage. Reading these states is the difference between following a game and just watching goals.

This guide explains what happens on the ice during a man advantage — not the infractions themselves. For the catalogue of tripping, hooking and high-sticking, see our guide to ice hockey penalties. To follow how a released goal is credited, read how ice hockey scoring works.

On the power play the extra skater is used to control the puck, spread the defence and create a high-percentage shot. On a minor penalty the power play ends the instant the power-play team scores — the penalised player is released and returns to the ice immediately. That early release is the single most important rule of special teams.

A 5-on-3 works differently. A single goal releases only one penalised player — the one whose penalty began first and has run longest — so the game returns to 5-on-4 rather than full strength. The second penalty keeps running until it expires or that team concedes again.

Coaches organise the five attackers into set shapes. The 1-3-1 places one player at the blue-line point, three across the middle and one at the net; the umbrella loads three players high for one-timers from the point. Both aim to move the penalty-killers out of position and open a shooting lane.

Elite NHL power plays convert around 20–25% of their chances, and the very best seasons push past 30%. That efficiency is why a single extra skater, held for just two minutes, can swing an entire game.

On the penalty kill the short-handed team defends with one fewer skater and tries to run down the clock. The key legal quirk: a short-handed team may ice the puck without an icing call. The icing rule is waved off while a team is short-handed, so defenders can fire the puck the length of the rink to clear their zone.

A short-handed goal — scored by the penalty-killing team — is fully legal and does not end the penalty. Killers usually defend in a compact box or diamond, collapsing toward the crease and pressuring the puck only when a clear opportunity appears.

A strong NHL penalty kill stops around 80–85% of opposing power plays over a season. The gap between a good kill and a bad one is often just a handful of goals across 82 games, yet it can decide a playoff spot.

If you are running a game, a live scoreboard for ice hockey shows the score, the game clock and a live penalty countdown, so spectators can see exactly when a killer returns to full strength.

Several situations change the skater math without a standard power play. Coincidental minors — matching penalties to both teams — are handled differently by the two rulebooks. In the NHL, each side loses a skater and the teams play 4-on-4 with no advantage; under IIHF rules the penalised players are replaced immediately, so both teams stay at full strength (5-on-5). Too many men on the ice is a bench minor, served by any skater the offending team chooses.

On a delayed penalty, the referee raises an arm but does not blow the whistle until the offending team touches the puck. The non-offending team can therefore pull its goalie for a sixth attacker, playing a temporary 6-on-5 with no risk of being scored on, because a whistle stops play the moment the other side gains possession.

A major penalty lasts the full 5 minutes and does not end early. Even if the penalty-killing team concedes two, three or more goals during it, the penalised player stays in the box until the time expires. This is the harshest special-teams state in the game, and it is why a major can flip a scoreline in a single shift.

Each of these states resets the moment the clock or the touch condition is met, so the on-ice count can change several times in a chaotic sequence.

Regular-season overtime in the NHL is played 3-on-3 for five minutes, and the IIHF also uses 3-on-3 overtime. The wide-open ice makes the man-advantage rules behave differently than they do in regulation, because removing a skater would leave almost no one to defend.

A penalty during 3-on-3 overtime does not drop the offending team to two skaters. Instead, the non-penalised team adds a skater, so play becomes 4-on-3. The league keeps the ice from emptying out. When the penalty expires, the teams play 4-on-4 until the next stoppage, then return to 3-on-3.

Playoff overtime is different: the NHL plays full 20-minute 5-on-5 periods until someone scores, with no shootout and no 3-on-3. Special teams there work exactly as they do in regulation.

If regular-season overtime solves nothing after five minutes, the game goes to a shootout — a separate tiebreaker that is not a power play at all, but a sequence of one-on-one attempts against the goalie.

Special-teams success is measured by two percentages. Power-play percentage (PP%) is power-play goals divided by power-play opportunities; penalty-kill percentage (PK%) is the share of opposing power plays that do not result in a goal. Together they are among the strongest predictors of a season's outcome.

A team that scores on 18 of 90 power plays has a PP% of 20.0%. A team that kills 84 of 100 penalties has a PK% of 84.0%. The two figures for the same club rarely move together, and a great power play can mask a leaky kill for a while.

JudgeMate does not compute season PP% or PK%. It is a free scoreboard for a single match — it tracks goals, the game clock, period and overtime progression, and a live penalty countdown, then lets you share the live view with spectators. Season-long special-teams analytics live elsewhere.

For how these and other numbers are defined and calculated, see ice hockey stats explained.