For those who don't know, it's all explained below:
http://www.mahjongnews.com/index.php/my ... intro.html
For those wanting to follow up, see the link one line up.
Vitaly's Mahjong mysteries - 5th season
Moderator: Shirluban
Vitaly's Mahjong mysteries - 5th season
Cats don't do タンヤオ (tan-yao) but タニャーオ (ta-nya-o).
World Riichi Championship Rules 2022
Comparison of riichi rules around the world
World Riichi Championship Rules 2022
Comparison of riichi rules around the world