Mat: minimum 8m × 8m IBJJF-approved competition mat with marked center + outer safety border; Match area defined by colored mat edge; Mat material: minimum 4 cm tatami-style thickness
Why people argue about this
People often assume that the 8m × 8m requirement means each competitor must have their own mat, which leads to misunderstandings about how mats are arranged at major championships where multiple mats might be used in parallel for more space. The actual rule allows for mats to share spaces as long as they meet all other requirements and provide adequate separation between competitors.