The Three-Point Line: How NBA Rule Changes Distort the Record Book

Published 10 September 2026Features

That growth followed decades of tactical evolution and a three-year period in the 1990s when league officials altered the physical dimensions of the court itself.

Standard basketball record books present career and single-season shooting leaderboards as unbroken historical rankings. They place performances from the 1980s next to outputs from the mid-1990s and the late 2010s without distinguishing between the different court dimensions or offensive styles in place at the time.

That presentation obscures the structural history of the shot.

Over the first four decades of the NBA three-point line, the boundary moved, the league experimented with a uniform distance, and attempt volumes multiplied dramatically. Evaluating any shooting record requires understanding the exact rule set in place when the ball left the shooter's hand.

From the ABA Experiment to the 1979 NBA Trial

The long-range shot did not originate in the NBA. The American Basketball Association introduced the three-point shot in its inaugural 1967-68 season, using the extra point to distinguish its product from the older league, reward perimeter marksmen, and open up floor space for drives to the basket.

Twelve years elapsed before the senior league adopted the concept. When the NBA introduced the three-point line for the 1979-80 season, it did so strictly on a provisional basis as a one-year trial.

The geometry of that 1979-80 line established the layout that defines the modern court. The league set the boundary at 23 feet 9 inches at the top of the key and 22 feet in the corners. The shorter distance in the corners accommodated the standard 50-foot court width, leaving room for a shooter's feet between the three-point line and the sideline.

Teams approached the new arc with hesitation. That 1979 baseline of 2.8 attempts per game per team demonstrated that coaches and players regarded the shot as an emergency option or a heave at the buzzer. Offensive possessions remained focused on interior play, post entries, and mid-range jumpers.

The Three-Season Experiment With a Shorter 22-Foot Arc

Fifteen years after introducing the shot, league executives decided to alter the court to influence offensive production. The NBA shortened the three-point line to a uniform 22 feet for the 1994-95 season.

The NBA reduced the three-point line from 23 feet 9 inches to 22 feet in an attempt to combat decreased scoring across the competition. Physical defensive tactics and grinding half-court possessions had lowered total game scores. League officials reasoned that shaving 21 inches off the distance at the top of the key would grant perimeter players more space, pulling defenders away from the paint.

The uniform 22-foot line eliminated the difference between the corner and the top of the arc. Every spot along the perimeter became a 22-foot shot.

That shortened line lasted for three seasons:

• The 1994-95 season
• The 1995-96 season
• The 1996-97 season

The experiment ended in 1997. For the 1997-98 season, the NBA returned the line to its original distance of 23 feet 9 inches at the top of the key and 22 feet in the corners. The league had altered the geography of the court for 36 months, then moved the boundary back.

Why Accuracy Figures Require an Era Filter

The existence of that three-season window creates a statistical distortion on historical leaderboards. A player shooting from the top of the key in 1995 stood 22 feet away from the rim. A player taking a shot from that same floor location in 1985 or 2005 stood 23 feet 9 inches away.

Ranking those two players on the same three-point field goal percentage table treats different physical tasks as identical. Shooting from 22 feet requires different shot power, release mechanics, and defensive closeout distances than shooting from nearly two feet further back.

The altered court produced a rise in perimeter conversion across those three specific campaigns. When those numbers are compiled into all-time accuracy leaderboards without notation, they obscure whether a shooter achieved high efficiency against the standard 23-foot-9-inch line or against the shortened 22-foot arc. Without an era tag, career and single-season percentage rankings present an incomplete picture of shooting performance.

The Four-Decade Surge in Long-Distance Volume

Perimeter volume changed even more drastically than the court measurements. Over the 40 NBA seasons running from 1979 to 2019, three-point attempts per game increased significantly when comparing decade averages.

The growth was steady across the decades before accelerating toward modern extremes. That initial average of 2.8 attempts per game in 1979 represented a tiny fraction of total offensive possessions. Entire teams often completed games with only one or two perimeter shots taken.

By the 2018-19 season, teams averaged 32.0 three-point attempts per game.

That jump from 2.8 shots in 1979 to 32.0 shots in 2018-19 rewrote tactical priorities and box scores. A high percentage recorded on 2.8 attempts per game occurred in an environment where defenses did not guard the arc and offenses did not design plays around it. A high percentage recorded on 32.0 attempts per game occurred against perimeter defensive schemes designed specifically to take the shot away.

A single all-time three-point leaderboard groups three distinct competitive conditions into one list: the low-volume introductory period following the 1979 trial, the three seasons of the shortened 22-foot line between 1994 and 1997, and the high-volume modern game.