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1,586 open mats

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Friday

2 of 1,682 sessions

22:15

– 22:30

Cave logo

Cave

Japan flag Sumida-ku, Japan オープンマット

22:30

– 23:00

Over Limit Chiba Sakura Jiu-Jitsu logo

Over Limit Chiba Sakura Jiu-Jitsu

Japan flag Chiba-city, Japan フリー練習

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It's a mess, I know.

My goal is to build the most comprehensive BJJ encyclopedia anywhere — but good, accurate data is genuinely hard to come by. Records, gyms, belts and nationalities are pieced together from public and community sources, so some of it is incomplete, outdated, or flat-out wrong.

That's where you come in. If you spot something off, tell me and I'll fix it — every correction makes this better for everyone. This website wouldn't be possible without the community.