Definition
Playing with an open rack means a beginner plays with their tiles visible so the table can help between decisions.
A generous convention for teaching nights; agree it up front so it does not feel like charity mid-hand.
Read the full guide: How to Host a Mahjong Game Night People Come Back To.
See it on real tiles: the coach reads any hand and names its direction, free, at the free read. Members get the coach on call for their own games.
More terms: Pung, Kong, Quint, Pair, Charleston, Blind pass, Courtesy pass, Joker.