What is the difference between American and Chinese mah jongg?

What is the difference between American and Chinese mah jongg? Traditional Chinese mahjong sets have 144 tiles, while American version is played with eight additional joker tiles and score cards that are published annually by non-profit organizations like National Mahjongg League. The league serves as the arbitrator for everything that relates to the American Mahjongg.

Traditional Chinese mahjong sets have 144 tiles, while American version is played with eight additional joker tiles and score cards that are published annually by non-profit organizations like National Mahjongg League. The league serves as the arbitrator for everything that relates to the American Mahjongg.
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