These rules are described in detail in Mahjong Competition Rules (The World Mahjong Organization, 2006), also known as 'The Green Book'. They were first used in an official tournament at the World Championship 2002 in Japan. The first major European tournament played by these rules was the 1st OEMC in Nijmegen, the Netherlands, during wich event EMA was founded.

Besides the MCR-Rulebook the 'Tournament Regulations' and the 'Referee Manual' are the official guidelines for MERS tournaments as from January 1st, 2009.

Green Book
Green Book - A5
Penalty overview

MERS tournament regulations - August 2010

MERS tournament regulations - August 2010 - Spanish version

Translations of the MCR rule book

Green Book, Spanish translation