ONE Championship Kickboxing Rules

ONE's kickboxing rules sit close to K-1: punches, kicks and knees are legal, elbows are not, and the clinch is permitted only briefly before the referee separates. What distinguishes the code is the judging philosophy, which ONE publishes explicitly and which pushes against the round-by-round accountancy common in Western combat sports. Judges are directed to weigh near-terminal impact first — knockdowns and strikes that visibly damage — and to assess the fight as a whole rather than adding up three separate verdicts.

In practice this means a fighter who is comfortably ahead on volume can still lose if the opponent hurt them badly once. It rewards power and finishing intent, and it removes much of the incentive to bank a lead early and coast. Coaches moving fighters between promotions treat it as a genuinely different strategic problem from GLORY, even though the legal techniques are nearly identical.

The division is also unusual for running kickboxing and Muay Thai side by side on the same cards, with many of the same athletes competing under both. That produces a direct, visible comparison between the two codes that no other promotion offers: the same fighter, weeks apart, with and without elbows and the full clinch.