In the game of iaido, performers don't kill each other but instead perform each school's kata; and if the organization includes several schools, an established kata also, whereupon they're evaluated on the performance of wazamae (kata) and judged by majority vote using flags or grades.
試合は実際に斬りあうのではなく、段位ごとに、各流派の形ならびに、各流派が集まる団体では共通の制定した形を加え、演武としての業前（形）を審判の旗の掲示による多数決や採点で評価することで執り行う。