Baseball · Official Rules of Baseball
Law 12: Interference, Obstruction and Collisions
3 parts · 5 tests · 50 facts · updated 27 October 2026 · markdown
Interference by batters, runners, team-mates, coaches, spectators and umpires, the fielder's right of way, squeeze-play interference, obstruction and the WBSC collision rule.
12.121Interference by the Batting Team
The batter and runners, team-mates round a base, coaches, double plays and the fielder's right of way.
Test 1Interference by the batter and runnersTake a test
The batter-runner is out, the ball is dead, and other runners return to their bases at the time of the pitch.
Source: WBSC ORB 2025-2026, Rule 12.1.1 · applied
Intentionally deflecting the course of a foul ball in any manner is interference.
Source: WBSC ORB 2025-2026, Rule 12.1.2 · applied
Before two are out, with a runner on third, batter interference with a play at home puts the runner out.
Source: WBSC ORB 2025-2026, Rule 12.1.3 · applied
Members of the team at bat who gather round a base to hinder the play cause the runner to be out.
Source: WBSC ORB 2025-2026, Rule 12.1.4 · applied
A runner's deliberate interference to break up a double play makes the ball dead; he and the batter-runner are out.
Source: WBSC ORB 2025-2026, Rule 12.1.6 · applied
The batter-runner is out, and so is the runner who had advanced closest to home, whatever the double play might have been.
Source: WBSC ORB 2025-2026, Rule 12.1.7 · recall
A base coach who touches or holds a runner to physically help him leave or return to a base causes interference.
Source: WBSC ORB 2025-2026, Rule 12.1.8 · applied
Interference on an uncaught third strike: batter-runner out, dead ball, runners back where they were at the pitch.
Source: WBSC ORB 2025-2026, Rule 12.1.1 · recall
The batting team must give fielders room; hindering a catch makes the ball dead, the batter out and the runners return.
Source: WBSC ORB 2025-2026, Rule 12.2 · recall
Blocking the catcher from his own dropped third strike costs the batter his chance to run: he is out.
Source: WBSC ORB 2025-2026, Rule 12.1.1 · applied
Test 2Fielders' right of wayTake a test
Players, coaches and any member of the team at bat must vacate any space a fielder needs, dugouts and bullpens included.
Source: WBSC ORB 2025-2026, Rule 12.2 · recall
With two fielders going for a ball, the umpire decides which is protected; contact with the other one is not interference.
Source: WBSC ORB 2025-2026, Rule 12.1.10 · applied
A ball that goes through or by an infielder and touches a runner immediately behind him does not make that runner out.
Source: WBSC ORB 2025-2026, Rule 12.1.11 · applied
Any runner who has just scored and hinders a following play on a runner causes that runner to be out.
Source: WBSC ORB 2025-2026, Rule 12.1.5 · applied
A runner who intentionally interferes with a thrown ball is out.
Source: WBSC ORB 2025-2026, Rule 12.1.10 · applied
Everything goes back to how it stood at the pitch: dead ball, batter out.
Source: WBSC ORB 2025-2026, Rule 12.2 · applied
The team at bat must vacate any space a fielder needs to field the ball, and that includes its own dugout.
Source: WBSC ORB 2025-2026, Rule 12.2 · applied
The umpire picks the fielder entitled to the protection; only contact with him can be interference.
Source: WBSC ORB 2025-2026, Rule 12.1.10 · recall
An uncaught pitch that stays near the plate and is inadvertently deflected by the batter or umpire is dead; runners return to their bases.
Source: WBSC ORB 2025-2026, Rule 12.1.1 · applied
A member of the batting team, other than a runner, who hinders a fielder's catch makes the ball dead and the batter out.
Source: WBSC ORB 2025-2026, Rule 12.2 · applied
12.122Other Interference
Unintentional interference, spectators, umpires and the catcher on a squeeze play.
Test 1Unintentional, spectator, umpire and squeeze-play interferenceTake a test
Unintentional interference by a person authorised to be on the field leaves the ball alive and in play.
Source: WBSC ORB 2025-2026, Rule 12.3 · applied
Spectator interference makes the ball dead at once, and the umpire imposes penalties to nullify the act.
Source: WBSC ORB 2025-2026, Rule 12.4 · applied
Umpire interference with the catcher's throw makes the ball dead and runners may not advance.
Source: WBSC ORB 2025-2026, Rule 12.5 · applied
The ball is dead; the batter-runner is awarded first and other runners advance only if forced.
Source: WBSC ORB 2025-2026, Rule 12.5 · applied
Catcher interference on a squeeze or steal of home: the pitcher is charged with a balk, the batter gets first and the ball is dead.
Source: WBSC ORB 2025-2026, Rule 12.6 · applied
Deliberate acts kill the ball on the spot, so nothing that follows counts.
Source: WBSC ORB 2025-2026, Rule 12.3 · recall
Reaching out of the stands and over the playing field to touch a ball in play is spectator interference.
Source: WBSC ORB 2025-2026, Rule 12.4 · applied
Three things happen together: a balk is charged, the play stops, and the batter goes to first.
Source: WBSC ORB 2025-2026, Rule 12.6 · recall
If spectator interference clearly prevents a catch, the umpire declares the batter out.
Source: WBSC ORB 2025-2026, Rule 12.4 · applied
The catch would have been made, so the umpire gives the defence its out.
Source: WBSC ORB 2025-2026, Rule 12.4 · applied
12.123Obstruction and Collisions
What obstruction is, its two kinds and the awards, and collisions at the plate and the bases.
Test 1ObstructionTake a test
Obstruction is the act of a fielder who, not holding the ball and not fielding it, impedes the progress of a runner.
Source: WBSC ORB 2025-2026, Rule 12.7 · recall
If the ball is in flight directly towards him and close enough that he must hold his position, he may be in the act of fielding.
Source: WBSC ORB 2025-2026, Rule 12.7 · recall
When a play is being made on the obstructed runner, the ball is dead and runners go to the bases they would have reached.
Source: WBSC ORB 2025-2026, Rule 12.7.2 · applied
For this type of obstruction the umpire points and calls it, lets the play continue, then awards bases if needed.
Source: WBSC ORB 2025-2026, Rule 12.7 · recall
Under the WBSC rules a runner cannot be visually obstructed by a fielder.
Source: WBSC ORB 2025-2026, Rule 12.7.8 · applied
The obstructed runner is awarded at least one base beyond the base he last touched legally.
Source: WBSC ORB 2025-2026, Rule 12.8.2 · applied
Holding or pushing a runner after a missed or wild throw gets past the fielder is obstruction.
Source: WBSC ORB 2025-2026, Rule 12.7.5 · applied
Obstruction of the batter-runner before first, or of a runner being played on, kills the ball, and bases are awarded.
Source: WBSC ORB 2025-2026, Rule 12.7.1 · recall
The rule sets a floor of one base, and the umpire may give more.
Source: WBSC ORB 2025-2026, Rule 12.8.2 · applied
A batter-runner obstructed after rounding first on a hit to the outfield is a classic case of obstruction.
Source: WBSC ORB 2025-2026, Rule 12.7.4 · applied
Test 2Collisions at home plate and the basesTake a test
The rule targets unnecessary and violent collisions, mainly with the catcher at home and with infielders at the bases.
Source: WBSC ORB 2025-2026, Rule 12.8 · recall
Contact above the waist is judged as an attempt to dislodge the ball from the fielder.
Source: WBSC ORB 2025-2026, Rule 12.8.1.2 · recall
If the runner attempted to dislodge the ball, he is out even if the fielder loses it; the ball is dead and runners return.
Source: WBSC ORB 2025-2026, Rule 12.8.1.3 · applied
If the fielder blocks the path, the runner may make contact as long as he is making a legitimate attempt to reach the plate.
Source: WBSC ORB 2025-2026, Rule 12.8.1.3 · applied
If the runner is safe and the collision is malicious, he is ruled safe and ejected from the game.
Source: WBSC ORB 2025-2026, Rule 12.8.1.5 · applied
Obstruction is called, but a flagrant collision gets the runner ejected; he is declared safe and the ball is dead.
Source: WBSC ORB 2025-2026, Rule 12.8.2.1 · applied
A preceding runner who touched the plate before the contact is safe; the ball is dead and other runners return.
Source: WBSC ORB 2025-2026, Rule 12.8.1.4 · applied
An attempt to dislodge the ball is out even if the ball comes loose; the ball is dead and others return.
Source: WBSC ORB 2025-2026, Rule 12.8.1.3 · recall
The umpire judges avoidability, then the runner's aim (contact above the waist counts as going for the ball), then malice.
Source: WBSC ORB 2025-2026, Rule 12.8.1 · recall
Contact above the waist is taken as an attempt to dislodge the ball, and that runner is out even if the ball comes loose.
Source: WBSC ORB 2025-2026, Rule 12.8.1.2 · applied
Sources
WBSC Official Rules of Baseball 2025-2026, Rule 12 (paraphrased in original wording; original questions authored from the Rules, not reproduced)
- WBSC ORB 2025-2026, Rule 12.25
- WBSC ORB 2025-2026, Rule 12.1.14
- WBSC ORB 2025-2026, Rule 12.44
- WBSC ORB 2025-2026, Rule 12.1.103
- WBSC ORB 2025-2026, Rule 12.73
- WBSC ORB 2025-2026, Rule 12.8.1.33
- WBSC ORB 2025-2026, Rule 12.32
- WBSC ORB 2025-2026, Rule 12.52
- WBSC ORB 2025-2026, Rule 12.62
- WBSC ORB 2025-2026, Rule 12.8.22
- WBSC ORB 2025-2026, Rule 12.8.1.22
- WBSC ORB 2025-2026, Rule 12.1.21
- WBSC ORB 2025-2026, Rule 12.1.31
- WBSC ORB 2025-2026, Rule 12.1.41
- WBSC ORB 2025-2026, Rule 12.1.61
- WBSC ORB 2025-2026, Rule 12.1.71
- WBSC ORB 2025-2026, Rule 12.1.81
- WBSC ORB 2025-2026, Rule 12.1.111
- WBSC ORB 2025-2026, Rule 12.1.51
- WBSC ORB 2025-2026, Rule 12.7.21
- WBSC ORB 2025-2026, Rule 12.7.81
- WBSC ORB 2025-2026, Rule 12.7.51
- WBSC ORB 2025-2026, Rule 12.7.11
- WBSC ORB 2025-2026, Rule 12.7.41
- WBSC ORB 2025-2026, Rule 12.81
- WBSC ORB 2025-2026, Rule 12.8.1.51
- WBSC ORB 2025-2026, Rule 12.8.2.11
- WBSC ORB 2025-2026, Rule 12.8.1.41
- WBSC ORB 2025-2026, Rule 12.8.11