Correction, 12 September 2026: The previous guide incorrectly included punches to a grounded opponent's head in its list of illegal strikes. Being grounded does not by itself make a legal punch to a legal target a foul. This replacement separates grounded-opponent rules, stoppages and scoring, and removes unsupported claims about recent officiating changes.
When a referee intervenes, start with what actually happened: a pause, a warning, an announced deduction or the end of the contest. These have different consequences. This guide uses the ABC's professional Unified Rules and a New York commission bulletin as concrete references. Check the rules adopted for the particular event, especially when watching an older fight or an amateur contest.
A grounded opponent: identify both the strike and the position
New York adopted the revised grounded-fighter definition from 1 November 2024. Under that definition, contact with the canvas by a body part other than the hands or feet makes a fighter grounded for the prohibition on knees and kicks to the head. Simply touching the floor with a hand does not establish that protection. New York commission bulletin, page 2.
These are hypothetical examples under that definition:
- One knee on the canvas: the fighter is grounded; a knee or kick to the head is prohibited.
- Only feet and hands on the canvas: that contact alone does not make the fighter grounded.
- A seated fighter receives a punch to the front of the head: grounded status alone does not make that punch illegal. Target and technique still matter.
Do not apply a modern definition retrospectively without checking the event. The same bulletin also documents New York's removal of the specific 12-to-6 elbow prohibition. A rule change has an adoption date and a jurisdiction, rather than automatically rewriting the history of every bout.
Legal ground striking does not remove other foul rules
The ABC's July 2024 rules separately prohibit attacks such as strikes to the back of the head or spine and eye gouging. They also distinguish putting a hand on the fence from hooking fingers into it to control position. “On the ground” and “near the fence” are therefore incomplete descriptions of a potential foul.
For a disputed sequence, identify the exact contact, the legal target and the relevant rule. Replays may clarify the view, but a slow-motion clip should still be placed in the context of the exchange and the rules used that night.
A stoppage is different from winning on the cards
Under the ABC rules, the referee is the official authorised to stop the contest. A submission, knockout or technical knockout ends a bout without the ordinary end-of-fight decision. An injury following a foul requires a different inquiry: whether the foul was intentional, whether the bout can continue, and how much of the scheduled fight has been completed can affect the recorded result. See the foul procedures and outcome definitions in the July 2024 rules.
Record the official announcement before describing the outcome. A doctor examining a fighter, a referee calling time and an announcer declaring a technical decision are separate moments.
A warning is different from a point deduction
When keeping your own card, enter a penalty only when the referee announces a deduction. The ABC's July 2025 scoring clarification explains deductions in the relevant round. A judge's assessment of the action and a referee's penalty are separate inputs.
For example, a hypothetical round scored 10–9 for Fighter A becomes 9–9 after a one-point deduction from A. That does not mean the judge considered the action even. Try the MMA scorecard: keep the original round assessment, then enter the deduction once.
Check the date printed on a rules document
At this guide's check date, the ABC rules index links to an August 2026 revision whose cover requests implementation of its new changes in November 2027. Its publication alone does not establish that an event has adopted those changes. Use the commission's applicable rules when assessing a specific decision.
Prepared with AI assistance; primary sources checked 12 September 2026. The examples are hypothetical educational illustrations, not official rulings on particular fights.