The one and only National Mah Jongg League official 2017 Hands and Rules Scorecard. To be relased on April 15th, 2017. Now in its 80th year, the National Mah Jongg League is the central authority on mahjong rules and scoring in the United States. For American mahjong players getting the new mahjong scorecard is a yearly ritual that keeps the game fresh. If you play mahjong with American rules, this is the one and only scorecard to have. Standard Size Card