World series of Mahjong rules (WSOM)
Overview
World series of Mahjong rules are derived from the Zung Jung Mahjong rules developed by Alan Kwan.
It's similar to Chinese Official or Hong Kong New Style, but with fewer scoring patterns so it's easier to learn.
Zung Jung does not have a minimum score requirement for winning a hand although but the version used by the WSOM does.
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