The Unified Rules of MMA Explained: Fouls, Grounded Fighters and the 12-6 Elbow

The Unified Rules of Mixed Martial Arts are the model rulebook published by the Association of Boxing Commissions and Combative Sports (ABC) for athletic commissions to adopt. The current version, numbered 8.2026 and amended on 5 August 2026, sets five-minute rounds, a maximum of five rounds, a referee who alone can stop the fight, the 10-point must system for scoring, and a list of 26 numbered fouls. The last changes to what is legal came in 2024: under the ABC text a fighter now counts as grounded only when a body part other than the hands or feet touches the canvas, and the downward "12-6" elbow is no longer on the fouls list.

The phrase "model rulebook" matters. Each commission decides whether and when to adopt a change, so the rules at a given event are the commission's rules — and, as the Nevada example below shows, they can still differ from the ABC's text.

Which document, and which version

The ABC's own header traces the history: approved in April 2001, amended in 2010, 2016, 2017, 2018, 2019 and 2023, then amended "with rule changes" on 23 July 2024 with a requested implementation date of November 2024, given a non-substantive revision in 2025, and amended again on 5 August 2026. The 2026 entry lists a requested implementation date of November 2027, as printed.

Comparing the 2025 and 2026 texts shows the 2026 changes are procedural. They restate the loss-of-bodily-function rule as a standalone section, add a procedure for a foul that leaves a fighter nauseous — a bucket, water to rinse the mouth, and the same five-minute limit — and revise the foul procedure into five steps. The fouls list itself is unchanged between the two versions.

The document also protects its own name: any modified form may not be called the Unified Rules of MMA and must instead carry the name of the commission sanctioning the event.

The fouls, grouped by what they protect

The list is numbered 1 to 27 but skips number 10, leaving 26 fouls. Reading them as a flat list hides the logic, so here they are by purpose, with the ABC's numbers.

Protected targets

• The back of the head and the spine (7). The rules draw the zone precisely: from the crown, one inch either side of the centre line, down to the nape of the neck; then the full width of the neck; then down the spine, one inch either side of its centre line, to the tailbone.
• The throat (8). Directed throat strikes and grabbing the trachea are fouls, but a strike thrown in stand-up action that happens to land on the throat is a legal blow.
• The groin (11), by striking, grabbing, pinching or twisting — and the rules say it applies equally to men and women.
• The eyes (2, 9). Gouging with fingers, chin or elbow is illegal; a legal punch that lands in the eye socket is not gouging. Reaching toward an opponent's face with fingers outstretched is a foul in itself, and fighters are told to close their fists or point their fingers upward.

Techniques that are banned outright

Head butts (1), biting and spitting (3), fish hooking (4), hair pulling (5), pile-driving an opponent onto their head or neck (6), small-joint manipulation (16), throwing an opponent out of the ring or cage (17), putting fingers into any orifice or cut (18), and clawing, pinching or twisting the flesh (19).

Two of these have useful edges. A throw with an arc to it is legal even if the opponent's head hits the canvas; a pile-driver is specifically driving a controlled, upside-down opponent into the floor head first. And for small joints, fingers and toes are protected while wrists, ankles, knees, shoulders and elbows are not — and grabbing most of the fingers or toes at once is allowed.

Rules for a grounded opponent

Kicking or kneeing the head of a grounded opponent (12) and stomping a grounded fighter (13) are fouls. An axe kick is not a stomp, and stomping on the feet of a standing fighter is not a foul.

Control and conduct

Holding the opponent's shorts or gloves (14); grabbing the fence or ropes with fingers or toes (15); timidity, including faking injury or deliberately dropping the mouthpiece (20); abusive language (21); flagrant disregard of the referee (22); unsportsmanlike conduct that injures an opponent (23); attacking after the bell (24), during a break (25) or while the opponent is under the referee's care (26); and interference from the corner (27).

The fence rule shows how precisely these are worded. Putting a hand on the fence and pushing off is legal, and so are toes through the mesh. The foul begins when fingers or toes grab the fence to control position. If the referee deducts a point for it and the fouling fighter has gained a superior position, the fighters are restarted standing.

The grounded fighter: one rule, three versions

Whether a knee to the head is legal turns on one definition, and it has changed.

Run three positions through it:

• Both feet down, one hand flat on the mat. Under the current ABC rule this fighter is not grounded, so a knee to the head is legal. Under the older ABC wording, and under Nevada's text, the weight-bearing hand makes them grounded.
• One knee on the canvas. Grounded under every version.
• Seated against the fence. Grounded under every version.

The first case is the one the 2024 change was aimed at. CBS Sports reported that the palm-down rule had encouraged fighters to put a palm on the mat to avoid a kick or knee to the head, leaving opponents unsure whether a strike would be legal, and that the amendment was meant to "de-gamify" that situation.