REK
- Documented bouts
- 1
- Fighters on record
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- Next
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San Francisco. Twelve events across two years, five with a named champion, and never a date announced in advance. REK publishes what happened, never what is coming — and, alone in this sport, it publishes how the scoring works down to the g-force.
No calendar Twelve events, every one of them past and sold out. REK's own code carries a state for an upcoming event and a ticket link, and both are unused today. It publishes the result, never the fixture.
Rules, in six lines
- Control
- Two divisions: AUTO, fully autonomous · PILOT, teleoperated
- Rounds
- 3 × 2:00, with 60-second pit intervals
- KO
- Ten-count. Three knockdowns in a round is a TKO; zero Integrity is a systems KO
- Arena
- Open fight space, no ring-out. Both machines start 3 m apart on the marks
- Weight
- One sealed machine, identical for both: 1.32 m, 35 kg, 29 actuated joints
- Manual resets
- None. In the pit: cooling and one battery swap. No repairs, no software changes
Nobody else in this sport publishes anything like this. Scoring is done by a computer — «the Arbiter» — reading both machines' own sensors at 500 Hz, and a strike only counts when two independent signals agree: a torque spike in the attacker's limb at striking speed, and an impact on the torso sensor of the machine that was hit, inside the same swing. Force decides the points, not where it lands. Pushing is not striking. Grappling is legal and never scores. Heat is stamina: a motor over its thermal limit is derated until it cools, so you lose power exactly where you spent it.
These are the rules of this competition. There is no such thing as “the rules of robot fighting”: every league writes its own, and that is why a bout here and a bout somewhere else are not the same event.
How a fight is scored
| Tier | Signal | Points | Note |
|---|---|---|---|
| CONTACT | Below 2.5 g | 0 | Touch, no score |
| CLEAN | 2.5 – 5 g | +1 | Verified strike |
| POWER | 5 – 10 g | +3 | Heavy strike |
| CRITICAL | Above 10 g | +5 | Maximum-force strike |
| STAGGER | Balance breach past 25°, recovered | +2 | To the striker |
| KNOCKDOWN | Torso past 60° from vertical | +10 | Triggers the ten-count |
Thresholds are set by measured calibration on the fight hardware and published before each event. A machine is down when its torso passes 60° and stays there — the Arbiter calls it from the machine's own sensors, the same way every time — and it has ten seconds to stand unaided and hold steady for a full second. Almost standing is still down, and there is no saving by the bell.
Events 12
- REK 2 REK Arena · San Francisco Champion Hiroyuki Osone video ↗
- REK Tokyo Belle Salle Akihabara B1F · Chiyoda-ku, Tokyo Champion Hiroyuki Osone
- REK Arena 0 REK Arena · San Francisco —
- REK x Sonance · Rumble for Rescue Los Molinos District · San Clemente —
- REK 1 Kezar Pavilion · San Francisco 50K+ Champion Dash Summit video ↗
- REK at xAI xAI HQ · Palo Alto 10K+ —
- REK at OpenAI OpenAI HQ · San Francisco 10K+ —
- REK America 04 25 Park Place · New York City 25K+ —
- REK America 03 Come and Take It Live · Austin 20K+ —
- REK America 02 Peppermint Hippo · Las Vegas 18K+ —
- REK America 01 Nocturne Theatre · Los Angeles 15K+ —
- REK 0 Temple Nightclub · San Francisco 35K+ Champion Justin Kan video ↗
Read at REK's own archive, event by event.
Results 1
Official channels
The record
How this league is documented, and where it is not. None of it is needed to follow the sport.
The telemetry
After every fight the full telemetry log goes to both teams, and protests are decided from the data rather than from memory. If telemetry is lost the fight pauses, and sustained loss from one machine is a fault against that machine. Tampering with it or spoofing it is a disqualification and a ban — in the league's own words, the data's integrity is the sport's integrity. That log is not published, which is why this page can tell you how REK scores a fight but not what any given fight scored.
An unresolved conflict
The league's rules say three rounds of two minutes. The press account of REK 1, in February 2026, described five rounds of sixty seconds. Ten events have been held since, so the format most likely changed — but nobody has published that it did, so we show the organiser's current figure and say where the other one came from.
Filed as CF-13 in the register of conflicts. We record both sides and resolve neither by our own judgement.
Sources 5
F-070 · F-076 · F-080 · F-185 · F-206
Every figure on this page traces to one of these. The full entry for each — publisher, URL, date read and evidence level — is in Sources.