The Trent Tucker Rule is a basketball rule that disallows any regular shot to be taken on the court if the ball is put into play with less than three-tenths of a second left on the game clock. The rule was passed after the 1989-90 season and named after New York Knicks player Trent Tucker, and officially adopted in FIBA play starting in 2010.
The Official Rules of the National Basketball Association state
The Article 16.2.5 of the 2010 FIBA Official Rules] state: "The game clock must indicate 0:00.3 (three tenths of a second) or more for a player to gain control of the ball on a throw-in or on a rebound after the last or only free throw in order to attempt a shot for a field goal. If the game clock indicates 0:00.2 or 0:00.1 the only type of a valid field goal made is by tapping or directly dunking the ball."
The rule was born out of a game between the Knicks and the Chicago Bulls on January 15, 1990 at Madison Square Garden. The game was tied at 106 with one-tenth of a second left in regulation and the Knicks in possession. During a time-out called by the Knicks, both teams prepared for what was seen as the only possible way the Knicks could win in regulation; an alley oop tap-in from out of bounds by Patrick Ewing.
When play resumed, the Knicks player throwing the ball in, Mark Jackson, saw the alley-oop play get broken up. He proceeded to throw the ball inbounds to Tucker, who was the only player open. Tucker then turned around and hit a three point jump shot before the buzzer, giving the Knicks the win, 109-106.
The Bulls later filed an official protest with the NBA about the play. By their estimate, the play took closer to two seconds. However, timekeeper Bob Billings and referee Ronnie Nunn, who were working that game, claimed everything went perfectly fine. The protest was disallowed.
Vice-president of operations Rod Thorn was the only NBA executive to side with the Bulls. (Incidentally, Thorn was once the general manager of the Bulls.) Thorn argued that it was physically impossible for a player to receive an inbounds pass and release it for a shot in a tenth of a second. He pointed out that tests in European basketball leagues, which had used the tenths-of-a-second clock for many years (the NBA had just adopted it for 1989-90), proved that a catch-and-shoot takes at least three-tenths of a second.
This became the backbone for the time requirements of the new rule. Teams with the possession of the ball with less than 00.3 left also have the option of trying a hail-mary shot like the one that the Knicks were going to try before Tucker's shot, or to simply let the clock run to zero.
Madison Square Garden, like the majority of NBA venues at the time, used an American Sign & Indicator scoreboard, and during the first weeks of the season, it was evident the manufacturer's scoreboards would have frequent calibration flaws with tenths in the final minute. In some cases the clock would be very inconsistent in timing tenths, while in other cases after calibration, the clock would actually "freeze" at one-tenth of a second before 00.0 appeared. The firm would be purchased by Trans-Lux eventually, and many college arenas which had the AS&I scoreboards did not modify their scoreboards to carry tenths, knowing of the problems, until at least their purchase by Trans-Lux. (The NCAA did not officially adopt tenths until 2001.)
The notorious scoreboard problems of the AS&I units led to most new arenas switching to rivals White Way, Daktronics (which Madison Square Garden now uses), or in recent years, Canadian manufacturer OES.
NBA Commissioner David Stern made it a requirement that all NBA arenas have their official game clocks properly calibrated in the wake of the incident, resulting in scoreboard overhaul. The AS&I scoreboards' notorious problem with clock mismanagement would sometimes still be a problem at some venues where the clock would still "hold" at one-tenth of a second, before the horn sounded. This was after Bulls coach Phil Jackson noted that this clock incident was not the first in Madison Square Garden. As a player for the Knicks in the 1970s, he noted that the clock there tended to run slower when they were behind, but faster when they were ahead.
Further changes in 1991 were designed to eliminate the problem with the AS&I units with a new directive for 1991-92 to add shot clocks with duplicate game time. At that point most venues purchased new scoreboards from White Way, Fair-Play, or Daktronics because of the calibration consistency of the new units.
Very few NBA teams purchased the AS&I (or later, Trans-Lux) units when the new rule was adopted in 1991. The last NBA arena to use the manufacturer's unit was the Charlotte Coliseum (II), which installed a successor Trans-Lux unit for the 2001-02 season (the Hornets' last in Charlotte), but the arena closed after the 2004-05 season, the Bobcats' inaugural season, after its replacement, Time Warner Cable Arena, opened (with a new Daktronics unit).
In 2002, the NBA instituted new rules regarding the end of period indicators. A LED light strip on the backboard replaced the traditional electric red light on the backboard, and a shot clock visible to all three viewable sides was mandated.
Venues using Daktronics units installed new four-sided shot clocks with red indicator lights on the sides of the shot time to further assist the electric light. By 2004, shot clocks were available with a perimeter light strip around the clock that also lit up when the clock read 00.0. Today, the see-through shot clock units from Daktronics and OES have implemented the light strips that surround the shot clock that are turned on upon the clock registering 00.0.
In recent years, timekeeping rules have changed with the implementation of a system where the blowing of an official's whistle stops the clock at the instant of the whistle, along with a rule change where the on-court official (not an official at the scorer's table) starts the clock by pressing a button attached to the official's belt.
On December 20, 2006, New York Knicks forward David Lee scored a game-winning basket with only 00.1 left on the clock. The shot counted because Lee deflected in the inbounds pass into the basket. This was the first occurrence of a team winning an NBA game with 00.1 left since Trent Tucker, and coincidentally from the same team, the New York Knicks. Furthermore, this took place after the NBA adopted the Precision Time Systems unit, where officials, not the timer, start the clock. In 2004, FIBA adopted a rule where the system would be mandatory in international competitions. [1] Michael Jordan, Charles Oakley and Patrick Ewing, all of whom participated in the original Trent Tucker game, were in attendance at the game in Madison Square Garden. [2]
In 2010, FIBA instituted Article 16.2.5 to officially institute the Trent Tucker Rule in international basketball.
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