The American Riichi Mahjong League (ARML)’s mission is to create a space where players from all over the country can compete against each other in a long-term structured format. The league was founded and is managed daily by NARMA Board Member Edwin Dizon, with the vision of building up the riichi mahjong scene in the USA to rival that of other regions of the world - specifically Europe and perhaps eventually Japan.

In ARML players from across the country can compete against each other in a structured longer-term setting, thereby raising the bar for everyone in the USA to compete with the rest of the world.

Based upon leagues in Japan, the ARML is broken into divisions of between 16-32 players.

Seasons are quarterly in length and involve 6 rounds held biweekly (every 2 weeks) with the 13th week reserved for playoffs if necessary.

Each round consists of players in groups of 4 playing 4 games at an agreed upon time within the biweekly period.

All games are played on Tenhou.