CHONGQING - The World Mahjong Organization on Wednesday standardized the height of the mahjong tiles that can be used in official competitions in an attempt to ensure the game will be "healthy, friendly and scientific".

The tiles used in official play can now be no shorter than 32 mm and no higher than 42 mm.

The World Mahjong Organization adopted the standard at the Fifth China Mahjong Forum and Championship, which ended on Wednesday in Chongqing.