Games between well-matched teams are frequently decided by special teams. The reason is that a one-man advantage changes the geometry of the defensive zone entirely.
Why one extra player matters so much
Defending in hockey depends on pressuring the puck carrier while covering passing options, and both tasks require enough bodies to go around.
Remove one defender and the remaining four must choose between pressuring the puck and covering the open man, and they cannot do both.
The attacking side simply moves the puck until the defence commits, which is why power-play goals often come after a period of patient possession rather than immediately.
The shape both sides adopt
The attacking team spreads into a formation that stretches the four defenders across the widest possible area, forcing long recoveries between passes.
Defences respond with a compact box or a diamond, conceding the perimeter and protecting the area in front of the goal where shots are most dangerous.
The contest becomes one of patience, since the attacking side is trying to make the box move and the defence is trying to hold its shape until time expires.
The shot from the point
Much of the power play is organised around a shot from the blue line, not because it is likely to score but because it creates rebounds and deflections.
A screen in front of the goaltender turns an ordinary shot into a dangerous one, since a puck that cannot be seen cannot be tracked.
Defences therefore spend much of the penalty clearing the front of the net, which is physically demanding and difficult to sustain for the full duration.
Why short-handed play is not hopeless
A team down a man can pressure aggressively, because the attacking side's spread formation leaves large gaps if the puck is turned over.
Short-handed chances are consequently more common than the numbers would suggest, and a goal conceded while on the power play is heavily damaging to momentum.
Killing a penalty without conceding is treated as a positive outcome in itself, and teams celebrate it in a way that reflects its real value.
How this shapes discipline
Because the scoring rate on a power play is several times the even-strength rate, avoiding penalties is worth more than most in-game tactical decisions.
Teams track which players take unnecessary penalties and coach specifically against the habits that produce them, particularly stick infractions from poor positioning.
Drawing penalties is valued for the same reason, and players who consistently force opponents into fouls contribute in a way that ordinary scoring statistics do not capture.
